mcs/class/referencesource/System.Runtime.Caching/System/Caching/SRef.cs

   1 // <copyright file="SRef.cs" company="Microsoft">
   2 //   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
   3 // </copyright>
   4 using System;
   5 using System.Globalization;
   6 using System.Reflection;
   7 using System.Security;
   8 using System.Security.Permissions;
   9 using System.Diagnostics.CodeAnalysis;
  10
  11 namespace System.Runtime.Caching {
  12     internal class SRef {
  13         private static Type s_type = Type.GetType("System.SizedReference", true, false);
  14         private Object _sizedRef;
  15
  16         internal SRef(Object target) {
  17             _sizedRef = Activator.CreateInstance(s_type,
  18                     BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.CreateInstance,
  19                     null,
  20                     new object[] { target },
  21                     null);
  22         }
  23
  24         internal long ApproximateSize {
  25             [SecuritySafeCritical]
  26             [PermissionSet(SecurityAction.Assert, Unrestricted = true)]
  27             get {
  28                 object o = s_type.InvokeMember("ApproximateSize",
  29                                                BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty,
  30                                                null, // binder
  31                                                _sizedRef, // target
  32                                                null, // args
  33                                                CultureInfo.InvariantCulture);
  34                 return (long)o;
  35             }
  36         }
  37
  38         //
  39         [SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Justification = "Grandfathered suppression from original caching code checkin")]
  40         [SecuritySafeCritical]
  41         [PermissionSet(SecurityAction.Assert, Unrestricted = true)]
  42         internal void Dispose() {
  43             s_type.InvokeMember("Dispose",
  44                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.InvokeMethod,
  45                                 null, // binder
  46                                 _sizedRef, // target
  47                                 null, // args
  48                                 CultureInfo.InvariantCulture);
  49         }
  50     }
  51 }