class/System.Xaml/System.Windows.Markup/StaticExtension.cs

   1 //
   2 // Copyright (C) 2010 Novell Inc. http://novell.com
   3 //
   4 // Permission is hereby granted, free of charge, to any person obtaining
   5 // a copy of this software and associated documentation files (the
   6 // "Software"), to deal in the Software without restriction, including
   7 // without limitation the rights to use, copy, modify, merge, publish,
   8 // distribute, sublicense, and/or sell copies of the Software, and to
   9 // permit persons to whom the Software is furnished to do so, subject to
  10 // the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be
  13 // included in all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  19 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  20 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  21 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 //
  23 using System;
  24 using System.Collections.Generic;
  25 using System.ComponentModel;
  26 using System.Reflection;
  27 using System.Xaml.Schema;
  28
  29 namespace System.Windows.Markup
  30 {
  31         [MarkupExtensionReturnType (typeof (object))]
  32         [TypeConverter (typeof (StaticExtensionConverter))]
  33         [System.Runtime.CompilerServices.TypeForwardedFrom (Consts.AssemblyPresentationFramework_3_5)]
  34         public class StaticExtension : MarkupExtension
  35         {
  36                 public StaticExtension ()
  37                 {
  38                 }
  39
  40                 public StaticExtension (string member)
  41                 {
  42                         Member = member;
  43                 }
  44
  45                 [ConstructorArgument ("member")]
  46                 public string Member { get; set; }
  47
  48                 [DefaultValue (null)]
  49                 public Type MemberType { get; set; }
  50
  51                 public override object ProvideValue (IServiceProvider serviceProvider)
  52                 {
  53                         if (Member == null)
  54                                 throw new InvalidOperationException ("Member property must be set to StaticExtension before calling ProvideValue method.");
  55                         if (MemberType != null) {
  56                                 var pi = MemberType.GetProperty (Member, BindingFlags.Public | BindingFlags.Static);
  57                                 if (pi != null)
  58                                         return pi.GetValue (null, null);
  59                                 var fi = MemberType.GetField (Member, BindingFlags.Public | BindingFlags.Static);
  60                                 if (fi != null)
  61                                         return fi.GetValue (null);
  62                         }
  63                         // there might be some cases that it could still
  64                         // resolve a static member without MemberType,
  65                         // but we don't know any of such so far.
  66                         throw new ArgumentException (String.Format ("Member '{0}' could not be resolved to a static member", Member));
  67                 }
  68         }
  69 }