mcs/class/referencesource/mscorlib/system/runtime/interopservices/windowsruntime/clrikeyvaluepairimpl.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 //
   7 // <OWNER>Microsoft</OWNER>
   8 // <OWNER>Microsoft</OWNER>
   9
  10 using System;
  11 using System.Collections.Generic;
  12 using System.Diagnostics.Contracts;
  13
  14 namespace System.Runtime.InteropServices.WindowsRuntime
  15 {
  16     // Provides access to a System.Collections.Generic.KeyValuePair<K, V> via the IKeyValuePair<K, V> WinRT interface.
  17     internal sealed class CLRIKeyValuePairImpl<K, V> : IKeyValuePair<K, V>
  18     {
  19         private readonly KeyValuePair<K, V> _pair;
  20
  21         public CLRIKeyValuePairImpl([In] ref KeyValuePair<K, V> pair)
  22         {
  23             _pair = pair;
  24         }
  25
  26         // IKeyValuePair<K, V> implementation
  27         [Pure]
  28         public K Key
  29         {
  30             get { return _pair.Key; }
  31         }
  32
  33         [Pure]
  34         public V Value
  35         {
  36             get { return _pair.Value; }
  37         }
  38
  39         // Called from the VM to wrap a boxed KeyValuePair with a CLRIKeyValuePairImpl.
  40         internal static object BoxHelper(object pair)
  41         {
  42             Contract.Requires(pair != null);
  43
  44             KeyValuePair<K, V> unboxedPair = (KeyValuePair<K, V>)pair;
  45             return new CLRIKeyValuePairImpl<K, V>(ref unboxedPair);
  46         }
  47
  48         // Called from the VM to get a boxed KeyValuePair out of a CLRIKeyValuePairImpl.
  49         internal static object UnboxHelper(object wrapper)
  50         {
  51             Contract.Requires(wrapper != null);
  52
  53             CLRIKeyValuePairImpl<K, V> reference = (CLRIKeyValuePairImpl<K, V>)wrapper;
  54             return reference._pair;
  55         }
  56
  57         public override string ToString()
  58         {
  59             return _pair.ToString();
  60         }
  61     }
  62 }