**** Merged from MCS ****

[mono-project.git] / mcs / class / corlib / System / Type.cs

//
// System.Type.cs
//
// Author:
//   Miguel de Icaza (miguel@ximian.com)
//
// (C) Ximian, Inc.  http://www.ximian.com
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Diagnostics;
using System.Reflection;
using System.Collections;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using System.Globalization;

namespace System {

        [Serializable]
        [ClassInterface (ClassInterfaceType.AutoDual)]
        public abstract class Type : MemberInfo, IReflect {
                
                internal RuntimeTypeHandle _impl;

                public static readonly char Delimiter = '.';
                public static readonly Type[] EmptyTypes = {};
                public static readonly MemberFilter FilterAttribute = new MemberFilter (FilterAttribute_impl);
                public static readonly MemberFilter FilterName = new MemberFilter (FilterName_impl);
                public static readonly MemberFilter FilterNameIgnoreCase = new MemberFilter (FilterNameIgnoreCase_impl);
                public static readonly object Missing;

                protected const BindingFlags DefaultBindingFlags =
                BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance;

                /* implementation of the delegates for MemberFilter */
                static bool FilterName_impl (MemberInfo m, object filterCriteria)
                {
                        string name = (string) filterCriteria;
                        return name.Equals (m.Name);
                }

                static bool FilterNameIgnoreCase_impl (MemberInfo m, object filterCriteria)
                {
                        string name = (string) filterCriteria;
                        if (name.Length != m.Name.Length)
                                return false;

                        return String.Compare (name, m.Name, true, CultureInfo.InvariantCulture) == 0;
                }

                static bool FilterAttribute_impl (MemberInfo m, object filterCriteria)
                {
                        int flags = ((IConvertible)filterCriteria).ToInt32 (null);
                        if (m is MethodInfo)
                                return ((int)((MethodInfo)m).Attributes & flags) != 0;
                        if (m is FieldInfo)
                                return ((int)((FieldInfo)m).Attributes & flags) != 0;
                        if (m is PropertyInfo)
                                return ((int)((PropertyInfo)m).Attributes & flags) != 0;
                        if (m is EventInfo)
                                return ((int)((EventInfo)m).Attributes & flags) != 0;
                        return false;
                }

                protected Type ()
                {
                }

                /// <summary>
                ///   The assembly where the type is defined.
                /// </summary>
                public abstract Assembly Assembly {
                        get;
                }

                /// <summary>
                ///   Gets the fully qualified name for the type including the
                ///   assembly name where the type is defined.
                /// </summary>
                public abstract string AssemblyQualifiedName {
                        get;
                }

                /// <summary>
                ///   Returns the Attributes associated with the type.
                /// </summary>
                public TypeAttributes Attributes {
                        get {
                                return GetAttributeFlagsImpl ();
                        }
                }

                /// <summary>
                ///   Returns the basetype for this type
                /// </summary>
                public abstract Type BaseType {
                        get;
                }

                /// <summary>
                ///   Returns the class that declares the member.
                /// </summary>
                public override Type DeclaringType {
                        get {
                                return null;
                        }
                }

                /// <summary>
                ///
                /// </summary>
                public static Binder DefaultBinder {
                        get {
                                return Binder.DefaultBinder;
                        }
                }

                /// <summary>
                ///    The full name of the type including its namespace
                /// </summary>
                public abstract string FullName {
                        get;
                }

                public abstract Guid GUID {
                        get;
                }

                public bool HasElementType {
                        get {
                                return HasElementTypeImpl ();
                        }
                }

                public bool IsAbstract {
                        get {
                                return (Attributes & TypeAttributes.Abstract) != 0;
                        }
                }

                public bool IsAnsiClass {
                        get {
                                return (Attributes & TypeAttributes.StringFormatMask)
                                == TypeAttributes.AnsiClass;
                        }
                }

                public bool IsArray {
                        get {
                                return IsArrayImpl ();
                        }
                }

                public bool IsAutoClass {
                        get {
                                return (Attributes & TypeAttributes.StringFormatMask) == TypeAttributes.AutoClass;
                        }
                }

                public bool IsAutoLayout {
                        get {
                                return (Attributes & TypeAttributes.LayoutMask) == TypeAttributes.AutoLayout;
                        }
                }

                public bool IsByRef {
                        get {
                                return IsByRefImpl ();
                        }
                }

                public bool IsClass {
                        get {
                                //
                                // This code used to probe for "this == typeof (System.Enum)", but in
                                // The .NET Framework 1.0, the above test return false
                                //
                                if (this == typeof (System.ValueType))
                                        return true;
                                if (IsInterface)
                                        return false;
                                return !type_is_subtype_of (this, typeof (System.ValueType), false);
                        }
                }

                public bool IsCOMObject {
                        get {
                                return IsCOMObjectImpl ();
                        }
                }

                public bool IsContextful {
                        get {
                                return IsContextfulImpl ();
                        }
                }

                public bool IsEnum {
                        get {
                                return type_is_subtype_of (this, typeof (System.Enum), false) &&
                                        this != typeof (System.Enum);
                        }
                }

                public bool IsExplicitLayout {
                        get {
                                return (Attributes & TypeAttributes.LayoutMask) == TypeAttributes.ExplicitLayout;
                        }
                }

                public bool IsImport {
                        get {
                                return (Attributes & TypeAttributes.Import) != 0;
                        }
                }

                public bool IsInterface {
                        get {
                                return (Attributes & TypeAttributes.ClassSemanticsMask) == TypeAttributes.Interface;
                        }
                }

                public bool IsLayoutSequential {
                        get {
                                return (Attributes & TypeAttributes.LayoutMask) == TypeAttributes.SequentialLayout;
                        }
                }

                public bool IsMarshalByRef {
                        get {
                                return IsMarshalByRefImpl ();
                        }
                }

                public bool IsNestedAssembly {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedAssembly;
                        }
                }

                public bool IsNestedFamANDAssem {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedFamANDAssem;
                        }
                }

                public bool IsNestedFamily {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedFamily;
                        }
                }

                public bool IsNestedFamORAssem {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedFamORAssem;
                        }
                }

                public bool IsNestedPrivate {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPrivate;
                        }
                }

                public bool IsNestedPublic {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NestedPublic;
                        }
                }

                public bool IsNotPublic {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.NotPublic;
                        }
                }

                public bool IsPointer {
                        get {
                                return IsPointerImpl ();
                        }
                }

                public bool IsPrimitive {
                        get {
                                return IsPrimitiveImpl ();
                        }
                }

                public bool IsPublic {
                        get {
                                return (Attributes & TypeAttributes.VisibilityMask) == TypeAttributes.Public;
                        }
                }

                public bool IsSealed {
                        get {
                                return (Attributes & TypeAttributes.Sealed) != 0;
                        }
                }

                public bool IsSerializable {
                        get {
                                // Enums and delegates are always serializable
                                return (Attributes & TypeAttributes.Serializable) != 0 || IsEnum || 
                                        type_is_subtype_of (this, typeof (System.Delegate), false);
                        }
                }

                public bool IsSpecialName {
                        get {
                                return (Attributes & TypeAttributes.SpecialName) != 0;
                        }
                }

                public bool IsUnicodeClass {
                        get {
                                return (Attributes & TypeAttributes.StringFormatMask) == TypeAttributes.UnicodeClass;
                        }
                }

                public bool IsValueType {
                        get {
                                return IsValueTypeImpl ();
                        }
                }

                public override MemberTypes MemberType {
                        get {return MemberTypes.TypeInfo;}
                }

#if NET_2_0 || BOOTSTRAP_NET_2_0
                override
#endif
                public abstract Module Module {get;}
        
                public abstract string Namespace {get;}

                public override Type ReflectedType {
                        get {
                                return null;
                        }
                }

                public abstract RuntimeTypeHandle TypeHandle {get;}

                public ConstructorInfo TypeInitializer {
                        get {
                                return GetConstructorImpl (
                                        BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static,
                                        null,
                                        CallingConventions.Any,
                                        EmptyTypes,
                                        null);
                        }
                }

                public abstract Type UnderlyingSystemType {get;}

                public override bool Equals (object o)
                {
                        if (o == null)
                                return false;
                        
                        // TODO: return UnderlyingSystemType == o.UnderlyingSystemType;
                        Type cmp = o as Type;
                        if (cmp == null)
                                return false;
                        return Equals (cmp);
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                public extern bool Equals (Type type);
                
                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                private static extern Type internal_from_handle (IntPtr handle);
                
                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                private static extern Type internal_from_name (string name, bool throwOnError, bool ignoreCase);

                public static Type GetType(string typeName)
                {
                        if (typeName == null)
                                throw new ArgumentNullException ("typeName");

                        return internal_from_name (typeName, false, false);
                }

                public static Type GetType(string typeName, bool throwOnError)
                {
                        if (typeName == null)
                                throw new ArgumentNullException ("typeName");

                        Type type = internal_from_name (typeName, throwOnError, false);
                        if (throwOnError && type == null)
                                throw new TypeLoadException ("Error loading '" + typeName + "'");

                        return type;
                }

                public static Type GetType(string typeName, bool throwOnError, bool ignoreCase)
                {
                        if (typeName == null)
                                throw new ArgumentNullException ("typeName");

                        Type t = internal_from_name (typeName, throwOnError, ignoreCase);
                        if (throwOnError && t == null)
                                throw new TypeLoadException ("Error loading '" + typeName + "'");

                        return t;
                }

                public static Type[] GetTypeArray (object[] args) {
                        if (args == null)
                                throw new ArgumentNullException ("args");

                        Type[] ret;
                        ret = new Type [args.Length];
                        for (int i = 0; i < args.Length; ++i)
                                ret [i] = args[i].GetType ();
                        return ret;
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                public extern static TypeCode GetTypeCode (Type type);

                [MonoTODO]
                public static Type GetTypeFromCLSID (Guid clsid)
                {
                        throw new NotImplementedException ();
                }

                [MonoTODO]
                public static Type GetTypeFromCLSID (Guid clsid, bool throwOnError)
                {
                        throw new NotImplementedException ();
                }

                [MonoTODO]
                public static Type GetTypeFromCLSID (Guid clsid, string server)
                {
                        throw new NotImplementedException ();
                }

                [MonoTODO]
                public static Type GetTypeFromCLSID (Guid clsid, string server, bool throwOnError)
                {
                        throw new NotImplementedException ();
                }

                public static Type GetTypeFromHandle (RuntimeTypeHandle handle)
                { 
                        return internal_from_handle (handle.Value);
                }

                [MonoTODO]
                public static Type GetTypeFromProgID (string progID)
                {
                        throw new NotImplementedException ();
                }

                [MonoTODO]
                public static Type GetTypeFromProgID (string progID, bool throwOnError)
                {
                        throw new NotImplementedException ();
                }

                [MonoTODO]
                public static Type GetTypeFromProgID (string progID, string server)
                {
                        throw new NotImplementedException ();
                }

                [MonoTODO]
                public static Type GetTypeFromProgID (string progID, string server, bool throwOnError)
                {
                        throw new NotImplementedException ();
                }

                public static RuntimeTypeHandle GetTypeHandle (object o)
                {
                        return o.GetType().TypeHandle;
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                internal static extern bool type_is_subtype_of (Type a, Type b, bool check_interfaces);

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                internal static extern bool type_is_assignable_from (Type a, Type b);
                
                public virtual bool IsSubclassOf (Type c)
                {
                        if (c == null)
                                return false;

                        return (this != c) && type_is_subtype_of (this, c, false);
                }

                public virtual Type[] FindInterfaces (TypeFilter filter, object filterCriteria)
                {
                        if (filter == null)
                                throw new ArgumentNullException ("filter");

                        ArrayList ifaces = new ArrayList ();
                        foreach (Type iface in GetInterfaces ()) {
                                if (filter (iface, filterCriteria))
                                        ifaces.Add (iface);
                        }

                        return (Type []) ifaces.ToArray (typeof (Type));
                }
                
                public Type GetInterface (string name) {
                        return GetInterface (name, false);
                }

                public abstract Type GetInterface (string name, bool ignoreCase);

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                internal static extern void GetInterfaceMapData (Type t, Type iface, out MethodInfo[] targets, out MethodInfo[] methods);
                
                public virtual InterfaceMapping GetInterfaceMap (Type interfaceType) {
                        InterfaceMapping res;
                        if (interfaceType == null)
                                throw new ArgumentNullException ("interfaceType");
                        if (!interfaceType.IsInterface)
                                throw new ArgumentException (Locale.GetText ("Argument must be an interface."), "interfaceType");
                        res.TargetType = this;
                        res.InterfaceType = interfaceType;
                        GetInterfaceMapData (this, interfaceType, out res.TargetMethods, out res.InterfaceMethods);
                        if (res.TargetMethods == null)
                                throw new ArgumentException (Locale.GetText ("Interface not found"), "interfaceType");

                        return res;
                }

                public abstract Type[] GetInterfaces ();

                public virtual bool IsAssignableFrom (Type c)
                {
                        if (c == null)
                                return false;

                        if (Equals (c))
                                return true;

                        return type_is_assignable_from (this, c);
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                public extern virtual bool IsInstanceOfType (object o);

                public virtual int GetArrayRank ()
                {
                        throw new NotSupportedException ();     // according to MSDN
                }

                public abstract Type GetElementType ();

                public EventInfo GetEvent (string name)
                {
                        return GetEvent (name, DefaultBindingFlags);
                }

                public abstract EventInfo GetEvent (string name, BindingFlags bindingAttr);

                public virtual EventInfo[] GetEvents ()
                {
                        return GetEvents (DefaultBindingFlags);
                }

                public abstract EventInfo[] GetEvents (BindingFlags bindingAttr);

                public FieldInfo GetField( string name)
                {
                        return GetField (name, DefaultBindingFlags);
                }

                public abstract FieldInfo GetField( string name, BindingFlags bindingAttr);

                public FieldInfo[] GetFields ()
                {
                        return GetFields (DefaultBindingFlags);
                }

                public abstract FieldInfo[] GetFields (BindingFlags bindingAttr);
                
                public override int GetHashCode()
                {
                        return (int)_impl.Value;
                }

                public MemberInfo[] GetMember (string name)
                {
                        return GetMember (name, DefaultBindingFlags);
                }
                
                public virtual MemberInfo[] GetMember (string name, BindingFlags bindingAttr)
                {
                        return GetMember (name, MemberTypes.All, bindingAttr);
                }

                public virtual MemberInfo[] GetMember (string name, MemberTypes type, BindingFlags bindingAttr)
                {
                        if ((bindingAttr & BindingFlags.IgnoreCase) != 0)
                                return FindMembers (type, bindingAttr, FilterNameIgnoreCase, name);
                        else
                                return FindMembers (type, bindingAttr, FilterName, name);
                }

                public MemberInfo[] GetMembers ()
                {
                        return GetMembers (DefaultBindingFlags);
                }

                public abstract MemberInfo[] GetMembers (BindingFlags bindingAttr);

                public MethodInfo GetMethod (string name)
                {
                        if (name == null)
                                throw new ArgumentNullException ("name");
                        return GetMethodImpl (name, DefaultBindingFlags, null, CallingConventions.Any, null, null);
                }

                public MethodInfo GetMethod (string name, BindingFlags bindingAttr)
                {
                        if (name == null)
                                throw new ArgumentNullException ("name");
                        
                        return GetMethodImpl (name, bindingAttr, null, CallingConventions.Any, null, null);
                }
                
                public MethodInfo GetMethod (string name, Type[] types)
                {
                        return GetMethod (name, DefaultBindingFlags, null, CallingConventions.Any, types, null);
                }

                public MethodInfo GetMethod (string name, Type[] types, ParameterModifier[] modifiers)
                {
                        return GetMethod (name, DefaultBindingFlags, null, CallingConventions.Any, types, modifiers);
                }

                public MethodInfo GetMethod (string name, BindingFlags bindingAttr, Binder binder,
                                             Type[] types, ParameterModifier[] modifiers)
                {
                        
                        return GetMethod (name, bindingAttr, binder, CallingConventions.Any, types, modifiers);
                }

                public MethodInfo GetMethod (string name, BindingFlags bindingAttr, Binder binder,
                                             CallingConventions callConvention, Type[] types, ParameterModifier[] modifiers)
                {
                        if (name == null)
                                throw new ArgumentNullException ("name");
                        if (types == null)
                                throw new ArgumentNullException ("types");

                        for (int i = 0; i < types.Length; i++) 
                                if (types[i] == null)
                                        throw new ArgumentNullException ("types");

                        return GetMethodImpl (name, bindingAttr, binder, callConvention, types, modifiers);
                }

                protected abstract MethodInfo GetMethodImpl (string name, BindingFlags bindingAttr, Binder binder,
                                                             CallingConventions callConvention, Type[] types,
                                                             ParameterModifier[] modifiers);

                public MethodInfo[] GetMethods ()
                {
                        return GetMethods (DefaultBindingFlags);
                }

                public abstract MethodInfo[] GetMethods (BindingFlags bindingAttr);

                public Type GetNestedType (string name)
                {
                        return GetNestedType (name, DefaultBindingFlags);
                }

                public abstract Type GetNestedType (string name, BindingFlags bindingAttr);

                public Type[] GetNestedTypes ()
                {
                        return GetNestedTypes (DefaultBindingFlags);
                }

                public abstract Type[] GetNestedTypes (BindingFlags bindingAttr);


                public PropertyInfo[] GetProperties ()
                {
                        return GetProperties (DefaultBindingFlags);
                }

                public abstract PropertyInfo[] GetProperties (BindingFlags bindingAttr);


                public PropertyInfo GetProperty (string name)
                {
                        if (name == null)
                                throw new ArgumentNullException ("name");

                        return GetPropertyImpl (name, DefaultBindingFlags, null, null, new Type[0], null);
                }

                public PropertyInfo GetProperty (string name, BindingFlags bindingAttr)
                {
                        if (name == null)
                                throw new ArgumentNullException ("name");
                        return GetPropertyImpl (name, bindingAttr, null, null, new Type[0], null);
                }

                public PropertyInfo GetProperty (string name, Type returnType)
                {
                        if (name == null)
                                throw new ArgumentNullException ("name");
                        return GetPropertyImpl (name, DefaultBindingFlags, null, returnType, new Type[0], null);
                }

                public PropertyInfo GetProperty (string name, Type[] types)
                {
                        return GetProperty (name, DefaultBindingFlags, null, null, types, null);
                }

                public PropertyInfo GetProperty (string name, Type returnType, Type[] types)
                {
                        return GetProperty (name, DefaultBindingFlags, null, returnType, types, null);
                }

                public PropertyInfo GetProperty( string name, Type returnType, Type[] types, ParameterModifier[] modifiers)
                {
                        return GetProperty (name, DefaultBindingFlags, null, returnType, types, modifiers);
                }

                public PropertyInfo GetProperty (string name, BindingFlags bindingAttr, Binder binder, Type returnType,
                                                 Type[] types, ParameterModifier[] modifiers)
                {
                        if (name == null)
                                throw new ArgumentNullException ("name");
                        if (types == null)
                                throw new ArgumentNullException ("types");

                        return GetPropertyImpl (name, bindingAttr, binder, returnType, types, modifiers);
                }

                protected abstract PropertyInfo GetPropertyImpl (string name, BindingFlags bindingAttr, Binder binder,
                                                                 Type returnType, Type[] types, ParameterModifier[] modifiers);

                protected abstract ConstructorInfo GetConstructorImpl (BindingFlags bindingAttr,
                                                                       Binder binder,
                                                                       CallingConventions callConvention,
                                                                       Type[] types,
                                                                       ParameterModifier[] modifiers);

                protected abstract TypeAttributes GetAttributeFlagsImpl ();
                protected abstract bool HasElementTypeImpl ();
                protected abstract bool IsArrayImpl ();
                protected abstract bool IsByRefImpl ();
                protected abstract bool IsCOMObjectImpl ();
                protected abstract bool IsPointerImpl ();
                protected abstract bool IsPrimitiveImpl ();
                
                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                internal static extern bool IsArrayImpl (Type type);

                protected virtual bool IsValueTypeImpl ()
                {
                        if (this == typeof (Enum) || this == typeof (ValueType))
                                return false;

                        return IsSubclassOf (typeof (ValueType));
                }
                
                protected virtual bool IsContextfulImpl ()
                {
                        return typeof (ContextBoundObject).IsAssignableFrom (this);
                }

                protected virtual bool IsMarshalByRefImpl ()
                {
                        return typeof (MarshalByRefObject).IsAssignableFrom (this);
                }

                public ConstructorInfo GetConstructor (Type[] types)
                {
                        return GetConstructorImpl (
                                DefaultBindingFlags, null, CallingConventions.Any, types, null);
                }

                public ConstructorInfo GetConstructor (BindingFlags bindingAttr, Binder binder,
                                                       Type[] types, ParameterModifier[] modifiers)
                {
                        return GetConstructorImpl (
                                bindingAttr, binder, CallingConventions.Any, types, modifiers);
                }

                public ConstructorInfo GetConstructor (BindingFlags bindingAttr, Binder binder,
                                                       CallingConventions callConvention,
                                                       Type[] types, ParameterModifier[] modifiers)
                {
                        if (types == null)
                                throw new ArgumentNullException ("types");

                        return GetConstructorImpl (bindingAttr, binder, callConvention, types, modifiers);
                }

                public ConstructorInfo[] GetConstructors ()
                {
                        return GetConstructors (BindingFlags.Public | BindingFlags.Instance);
                }
                
                public abstract ConstructorInfo[] GetConstructors (BindingFlags bindingAttr);

                public virtual MemberInfo[] GetDefaultMembers ()
                {
                        object [] att = GetCustomAttributes (typeof (DefaultMemberAttribute), true);
                        if (att.Length == 0)
                                return new MemberInfo [0];

                        MemberInfo [] member = GetMember (((DefaultMemberAttribute) att [0]).MemberName);
                        return (member != null) ? member : new MemberInfo [0];
                }

                public virtual MemberInfo[] FindMembers (MemberTypes memberType, BindingFlags bindingAttr,
                                                         MemberFilter filter, object filterCriteria)
                {
                        MemberInfo[] result;
                        ArrayList l = new ArrayList ();

                        // Console.WriteLine ("FindMembers for {0} (Type: {1}): {2}",
                        // this.FullName, this.GetType().FullName, this.obj_address());

                        if ((memberType & MemberTypes.Constructor) != 0) {
                                ConstructorInfo[] c = GetConstructors (bindingAttr);
                                if (filter != null) {
                                        foreach (MemberInfo m in c) {
                                                if (filter (m, filterCriteria))
                                                        l.Add (m);
                                        }
                                } else {
                                        l.AddRange (c);
                                }
                        }
                        if ((memberType & MemberTypes.Event) != 0) {
                                EventInfo[] c = GetEvents (bindingAttr);
                                if (filter != null) {
                                        foreach (MemberInfo m in c) {
                                                if (filter (m, filterCriteria))
                                                        l.Add (m);
                                        }
                                } else {
                                        l.AddRange (c);
                                }
                        }
                        if ((memberType & MemberTypes.Field) != 0) {
                                FieldInfo[] c = GetFields (bindingAttr);
                                if (filter != null) {
                                        foreach (MemberInfo m in c) {
                                                if (filter (m, filterCriteria))
                                                        l.Add (m);
                                        }
                                } else {
                                        l.AddRange (c);
                                }
                        }
                        if ((memberType & MemberTypes.Method) != 0) {
                                MethodInfo[] c = GetMethods (bindingAttr);
                                if (filter != null) {
                                        foreach (MemberInfo m in c) {
                                                if (filter (m, filterCriteria))
                                                        l.Add (m);
                                        }
                                } else {
                                        l.AddRange (c);
                                }
                        }
                        if ((memberType & MemberTypes.Property) != 0) {
                                PropertyInfo[] c;
                                int count = l.Count;
                                Type ptype;
                                if (filter != null) {
                                        ptype = this;
                                        while ((l.Count == count) && (ptype != null)) {
                                                c = ptype.GetProperties (bindingAttr);
                                                foreach (MemberInfo m in c) {
                                                        if (filter (m, filterCriteria))
                                                                l.Add (m);
                                                }
                                                ptype = ptype.BaseType;
                                        }
                                } else {
                                        c = GetProperties (bindingAttr);
                                        l.AddRange (c);
                                }
                        }
                        if ((memberType & MemberTypes.NestedType) != 0) {
                                Type[] c = GetNestedTypes (bindingAttr);
                                if (filter != null) {
                                        foreach (MemberInfo m in c) {
                                                if (filter (m, filterCriteria)) {
                                                        l.Add (m);
                                                }
                                        }
                                } else {
                                        l.AddRange (c);
                                }
                        }
                        result = new MemberInfo [l.Count];
                        l.CopyTo (result);
                        return result;
                }

                [DebuggerHidden]
                [DebuggerStepThrough] 
                public object InvokeMember (string name, BindingFlags invokeAttr, Binder binder, object target, object[] args)
                {
                        return InvokeMember (name, invokeAttr, binder, target, args, null, null, null);
                }

                [DebuggerHidden]
                [DebuggerStepThrough] 
                public object InvokeMember (string name, BindingFlags invokeAttr, Binder binder,
                                            object target, object[] args, CultureInfo culture)
                {
                        return InvokeMember (name, invokeAttr, binder, target, args, null, culture, null);
                }

                public abstract object InvokeMember (string name, BindingFlags invokeAttr,
                                                     Binder binder, object target, object[] args,
                                                     ParameterModifier[] modifiers,
                                                     CultureInfo culture, string[] namedParameters);

                public override string ToString()
                {
                        return FullName;
                }

                internal object[] GetPseudoCustomAttributes () {
                        int count = 0;

                        /* StructLayoutAttribute is not returned by MS.NET */

                        if (IsSerializable)
                                count ++;

                        if (count == 0)
                                return null;
                        object[] attrs = new object [count];
                        count = 0;

                        if (IsSerializable)
                                attrs [count ++] = new SerializableAttribute ();

                        return attrs;
                }

#if NET_2_0 || BOOTSTRAP_NET_2_0
                public abstract Type[] GetGenericArguments ();

                public abstract bool HasGenericArguments {
                        get;
                }

                public abstract bool ContainsGenericParameters {
                        get;
                }

                public extern bool IsGenericTypeDefinition {
                        [MethodImplAttribute(MethodImplOptions.InternalCall)]
                        get;
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                extern Type GetGenericTypeDefinition_impl ();

                public virtual Type GetGenericTypeDefinition ()
                {
                        Type res = GetGenericTypeDefinition_impl ();
                        if (res == null)
                                throw new InvalidOperationException ();

                        return res;
                }

                public extern bool IsGenericInstance {
                        [MethodImplAttribute(MethodImplOptions.InternalCall)]
                        get;
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                static extern Type BindGenericParameters (Type gt, Type [] types);
                
                public Type BindGenericParameters (Type [] types)
                {
                        if (types == null)
                                throw new ArgumentNullException ("types");
                        foreach (Type t in types) {
                                if (t == null)
                                        throw new ArgumentNullException ("types");
                        }
                        Type res = BindGenericParameters (this, types);
                        if (res == null)
                                throw new TypeLoadException ();
                        return res;
                }

                public abstract bool IsGenericParameter {
                        get;
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                extern int GetGenericParameterPosition ();
                
                public virtual int GenericParameterPosition {
                        get {
                                int res = GetGenericParameterPosition ();
                                if (res < 0)
                                        throw new InvalidOperationException ();
                                return res;
                        }
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                extern GenericParameterAttributes GetGenericParameterAttributes ();

                public virtual GenericParameterAttributes GenericParameterAttributes {
                        get {
                                if (!IsGenericParameter)
                                        throw new InvalidOperationException ();

                                return GetGenericParameterAttributes ();
                        }
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                extern Type[] GetGenericParameterConstraints_impl ();

                public virtual Type[] GetGenericParameterConstraints ()
                {
                        if (!IsGenericParameter)
                                throw new InvalidOperationException ();

                        return GetGenericParameterConstraints_impl ();
                }

                public abstract MethodInfo DeclaringMethod {
                        get;
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                extern Type make_array_type (int rank);

                public virtual Type MakeArrayType ()
                {
                        return MakeArrayType (1);
                }

                public virtual Type MakeArrayType (int rank)
                {
                        if (rank < 1)
                                throw new IndexOutOfRangeException ();
                        return make_array_type (rank);
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                extern Type make_byref_type ();

                public virtual Type MakeByRefType ()
                {
                        return make_byref_type ();
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                public extern virtual Type MakePointerType ();

                [MonoTODO]
                public static Type ReflectionOnlyGetType (string typeName, 
                                                                                                  bool throwIfNotFound, 
                                                                                                  bool ignoreCase)
                {
                        throw new NotImplementedException ();
                }

                [MethodImplAttribute(MethodImplOptions.InternalCall)]
                extern void GetPacking (out int packing, out int size);         

                public virtual StructLayoutAttribute StructLayoutAttribute {
                        get {
                                LayoutKind kind;

                                if (IsLayoutSequential)
                                        kind = LayoutKind.Sequential;
                                else if (IsExplicitLayout)
                                        kind = LayoutKind.Explicit;
                                else
                                        kind = LayoutKind.Auto;

                                StructLayoutAttribute attr = new StructLayoutAttribute (kind);

                                if (IsUnicodeClass)
                                        attr.CharSet = CharSet.Unicode;
                                else if (IsAnsiClass)
                                        attr.CharSet = CharSet.Ansi;
                                else
                                        attr.CharSet = CharSet.Auto;

                                if (kind != LayoutKind.Auto)
                                        GetPacking (out attr.Pack, out attr.Size);

                                return attr;
                        }
                }
#endif
        }
}