42 lines
2.2 KiB
C#
42 lines
2.2 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ExecutionContextUtil.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.Util {
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using System;
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using System.Reflection;
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using System.Security.Permissions;
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using System.Threading;
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// This class contains utility methods for dealing with security contexts when crossing AppDomain boundaries.
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[SecurityPermission(SecurityAction.LinkDemand, Unrestricted = true)]
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internal static class ExecutionContextUtil {
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private static readonly ContextCallback s_actionToActionObjShunt = obj => ((Action)obj)();
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private static readonly ExecutionContext s_dummyDefaultEC = GetDummyDefaultEC();
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[ReflectionPermission(SecurityAction.Assert, MemberAccess = true)]
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private static ExecutionContext GetDummyDefaultEC() {
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// The ExecutionContext.PreAllocatedDefault property is special-cased by ExecutionContext to be a blank context and to allow multiple invocation.
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PropertyInfo propInfo = typeof(ExecutionContext).GetProperty("PreAllocatedDefault", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
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if (propInfo == null) {
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throw new Exception(SR.GetString(SR.Type_doesnt_have_property, typeof(ExecutionContext).FullName, "PreAllocatedDefault"));
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}
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return (ExecutionContext) propInfo.GetValue(null, null);
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}
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// Removes all context associated with the current thread (call context, IPrincipal, etc.) and invokes the provided callback.
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// The intent of this method is to get any user-provided context off the current thread before crossing an AppDomain boundary,
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// as the existence of that context could lead to behavioral problems (see DevDiv #205764) or security problems (see DevDiv #206598).
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internal static void RunInNullExecutionContext(Action callback) {
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ExecutionContext.Run(s_dummyDefaultEC, s_actionToActionObjShunt, callback);
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}
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}
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}
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