class/System.ComponentModel.Composition/src/Composition.Initialization/System/ComponentModel/Composition/ExportFactoryOfT.cs

   1 // -----------------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 // -----------------------------------------------------------------------
   4 using System;
   5 using Microsoft.Internal;
   6 using System.ComponentModel.Composition.Primitives;
   7
   8 namespace System.ComponentModel.Composition
   9 {
  10     public class ExportFactory<T>
  11     {
  12         private Func<Tuple<T, Action>> _exportLifetimeContextCreator;
  13
  14         public ExportFactory(Func<Tuple<T, Action>> exportLifetimeContextCreator)
  15         {
  16             if (exportLifetimeContextCreator == null)
  17             {
  18                 throw new ArgumentNullException("exportLifetimeContextCreator");
  19             }
  20
  21             this._exportLifetimeContextCreator = exportLifetimeContextCreator;
  22         }
  23
  24         public ExportLifetimeContext<T> CreateExport()
  25         {
  26             Tuple<T, Action> untypedLifetimeContext = this._exportLifetimeContextCreator.Invoke();
  27             return new ExportLifetimeContext<T>(untypedLifetimeContext.Item1, untypedLifetimeContext.Item2);
  28         }
  29     }
  30 }