class/System.ComponentModel.Composition/src/ComponentModel/Microsoft/Internal/ContractServices.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.ComponentModel.Composition.Hosting;
   4 using System.Linq;
   5 using System.Text;
   6 using System.Threading;
   7 using System.ComponentModel.Composition.Primitives;
   8
   9 namespace Microsoft.Internal
  10 {
  11     internal class ContractServices
  12     {
  13         public static T Cast<T>(object o)
  14         {
  15             return (T)o;
  16         }
  17
  18         public static bool TryCast(Type contractType, object value, out object result)
  19         {
  20             if (value == null)
  21             {
  22                 result = null;
  23                 return true;
  24             }
  25             if (contractType.IsInstanceOfType(value))
  26             {
  27                 result = value;
  28                 return true;
  29             }
  30
  31             // We couldn't cast see if a delegate works for us.
  32             if (typeof(Delegate).IsAssignableFrom(contractType))
  33             {
  34                 ExportedDelegate exportedDelegate = value as ExportedDelegate;
  35                 if (exportedDelegate != null)
  36                 {
  37                     result = exportedDelegate.CreateDelegate(contractType);
  38                     return (result != null);
  39                 }
  40             }
  41
  42             result = null;
  43             return false;
  44         }
  45     }
  46 }
  47