mcs/class/System.Web/System.Web.UI/PropertyConverter.cs

   1
   2 //
   3 // Permission is hereby granted, free of charge, to any person obtaining
   4 // a copy of this software and associated documentation files (the
   5 // "Software"), to deal in the Software without restriction, including
   6 // without limitation the rights to use, copy, modify, merge, publish,
   7 // distribute, sublicense, and/or sell copies of the Software, and to
   8 // permit persons to whom the Software is furnished to do so, subject to
   9 // the following conditions:
  10 //
  11 // The above copyright notice and this permission notice shall be
  12 // included in all copies or substantial portions of the Software.
  13 //
  14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  17 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  18 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  19 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  20 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21 //
  22 /**
  23  * Namespace: System.Web.UI
  24  * Class:     PropertyConverter
  25  *
  26  * Author:  Gaurav Vaish
  27  * Maintainer: gvaish@iitk.ac.in
  28  * Implementation: yes
  29  * Contact: <gvaish@iitk.ac.in>
  30  * Status:  100%
  31  *
  32  * (C) Gaurav Vaish (2001)
  33  */
  34
  35 using System;
  36 using System.ComponentModel;
  37 using System.Globalization;
  38 using System.Reflection;
  39
  40 namespace System.Web.UI
  41 {
  42         public sealed class PropertyConverter
  43         {
  44                 private static Type[] parseMethodTypes;
  45                 private static Type[] parseMethodTypesWithSOP;
  46
  47                 static PropertyConverter()
  48                 {
  49                         parseMethodTypes = new Type[1];
  50                         parseMethodTypes[0] = typeof(string);
  51                         parseMethodTypesWithSOP = new Type[2];
  52                         parseMethodTypesWithSOP[0] = typeof(string);
  53                         parseMethodTypesWithSOP[1] = typeof(IServiceProvider);
  54                 }
  55
  56                 private PropertyConverter()
  57                 {
  58                         // Prevent any instance
  59                 }
  60
  61                 public static object EnumFromString(Type enumType, string enumValue)
  62                 {
  63                         object retVal = null;
  64                         try
  65                         {
  66                                 retVal = Enum.Parse(enumType, enumValue, true);
  67                         } catch
  68                         {
  69                                 retVal = null;
  70                         }
  71                         return retVal;
  72                 }
  73
  74                 public static string EnumToString(Type enumType, object enumValue)
  75                 {
  76                         string retVal = Enum.Format(enumType, enumValue, "G");
  77                         return retVal.Replace('_','-');
  78                 }
  79
  80                 public static object ObjectFromString(Type objType, MemberInfo propertyInfo, string objValue)
  81                 {
  82                         if(objValue == null)
  83                                 return null;
  84                         if(! (!objType.Equals(typeof(Boolean)) || objValue.Length > 0) )
  85                         {
  86                                 return null;
  87                         }
  88                         if(objType.IsEnum)
  89                         {
  90                                 return EnumFromString(objType, objValue);
  91                         }
  92                         if(objType.Equals(typeof(string)))
  93                         {
  94                                 return objValue;
  95                         }
  96                         PropertyDescriptor pc = null;
  97                         if(propertyInfo != null)
  98                         {
  99                                 pc = (TypeDescriptor.GetProperties(propertyInfo.ReflectedType))[propertyInfo.Name];
 100                         }
 101                         if(pc != null)
 102                         {
 103                                 TypeConverter converter = pc.Converter;
 104                                 if(converter!=null && converter.CanConvertFrom(typeof(string)))
 105                                 {
 106                                         return converter.ConvertFromInvariantString(objValue);
 107                                 }
 108                         }
 109                         MethodInfo mi = objType.GetMethod("Parse", parseMethodTypesWithSOP);
 110                         object o = null;
 111                         if(mi != null)
 112                         {
 113                                 object[] parameters = new object[2];
 114                                 parameters[0] = objValue;
 115                                 parameters[1] = CultureInfo.InvariantCulture;
 116                                 try
 117                                 {
 118                                         o = Utils.InvokeMethod(mi, null, parameters);
 119                                 } catch
 120                                 {
 121                                 }
 122                         }
 123                         if(o == null)
 124                         {
 125                                 mi = objType.GetMethod("Parse", parseMethodTypes);
 126                                 if(mi!=null)
 127                                 {
 128                                         object[] parameters = new object[1];
 129                                         parameters[0] = objValue;
 130                                         try
 131                                         {
 132                                                 o = Utils.InvokeMethod(mi, null, parameters);
 133                                         } catch
 134                                         {
 135                                         }
 136                                 }
 137                         }
 138                         if(o == null)
 139                         {
 140                                 throw new HttpException(/*HttpRuntime.FormatResourceString(*/"Type_not_creatable_from_string"/*, objType.FullName, objValue, propertyInfo.Name)*/);
 141                         }
 142                         return o;
 143                 }
 144         }
 145 }