mcs/class/System.ComponentModel.Composition.4.5/src/ComponentModel/System/ComponentModel/Composition/Primitives/ExportedDelegate.cs

   1 // -----------------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 // -----------------------------------------------------------------------
   4 using System;
   5 using System.Diagnostics.CodeAnalysis;
   6 using System.Reflection;
   7 using Microsoft.Internal;
   8 using System.Linq.Expressions;
   9
  10 namespace System.ComponentModel.Composition.Primitives
  11 {
  12     [SuppressMessage("Microsoft.Naming", "CA1711:IdentifiersShouldNotHaveIncorrectSuffix")]
  13     public class ExportedDelegate
  14     {
  15         private object _instance;
  16         private MethodInfo _method;
  17
  18         protected ExportedDelegate() { }
  19
  20 #if FEATURE_CAS_APTCA
  21         [System.Security.SecurityCritical]
  22 #endif //FEATURE_CAS_APTCA
  23         public ExportedDelegate(object instance, MethodInfo method)
  24         {
  25             Requires.NotNull(method, "method");
  26
  27             this._instance = instance;
  28             this._method = method;
  29         }
  30
  31         public virtual Delegate CreateDelegate(Type delegateType)
  32         {
  33             Requires.NotNull(delegateType, "delegateType");
  34
  35             if (delegateType == typeof(Delegate) || delegateType == typeof(MulticastDelegate))
  36             {
  37                 delegateType = this.CreateStandardDelegateType();
  38             }
  39
  40             return Delegate.CreateDelegate(delegateType, this._instance, this._method, false);
  41         }
  42
  43         private Type CreateStandardDelegateType()
  44         {
  45 #if MONOTOUCH
  46             throw new NotImplementedException ();
  47 #else
  48             ParameterInfo[] parameters = this._method.GetParameters();
  49
  50             // This array should contains a lit of all argument types, and the last one is the return type (could be void)
  51             Type[] parameterTypes = new Type[parameters.Length + 1];
  52             parameterTypes[parameters.Length] = this._method.ReturnType;
  53             for (int i = 0; i < parameters.Length; i++ )
  54             {
  55                 parameterTypes[i] = parameters[i].ParameterType;
  56             }
  57
  58             return Expression.GetDelegateType(parameterTypes);
  59 #endif
  60         }
  61     }
  62 }