53 lines
2.2 KiB
C#
53 lines
2.2 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="SystemWebProxy.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.Collections.Generic;
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using System.Diagnostics;
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using System.Reflection;
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using System.Web.Security;
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using System.Security.Permissions;
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// Because this assembly ships in the client SKU, whereas System.Web.dll ships in the Extended SKU, we need to
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// proxy any usage of System.Web.dll. This allows us to fail gracefully if the Extended SKU is not present.
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// Users can avoid this failure by overridding all virtual members on both of these types which will prevent
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// this class, and hence, System.Web.dll, from ever being called.
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internal static class SystemWebProxy {
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public static readonly IMembershipAdapter Membership = GetMembershipAdapter();
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private static IMembershipAdapter GetMembershipAdapter() {
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IMembershipAdapter membership = CreateSystemWebMembershipAdapter();
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if (membership == null) {
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membership = new DefaultMembershipAdapter();
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}
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return membership;
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}
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private static IMembershipAdapter CreateSystemWebMembershipAdapter() {
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Type type = Type.GetType("System.Web.Security.MembershipAdapter, " + AssemblyRef.SystemWeb, throwOnError:false);
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if (type != null) {
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// Running on Extended SKU
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return (IMembershipAdapter)DangerousCreateInstance(type);
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}
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// Running on Client SKU
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return null;
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}
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// Partially trusted callers might not have permissions to create an instance of
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// System.Web’s MembershipAdapter type (it’s an internal type), so give them access.
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[ReflectionPermission(SecurityAction.Assert, Flags=ReflectionPermissionFlag.MemberAccess)]
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private static object DangerousCreateInstance(Type type) {
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return Activator.CreateInstance(type);
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}
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}
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}
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