74 lines
3.3 KiB
C#
74 lines
3.3 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="SynchronizationContextUtil.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.Web;
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internal static class SynchronizationContextUtil {
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public static SynchronizationContextMode CurrentMode {
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get {
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return (!AppSettings.UseTaskFriendlySynchronizationContext) ? SynchronizationContextMode.Legacy : SynchronizationContextMode.Normal;
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}
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}
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private static string FormatErrorMessage(string specificErrorMessage, SynchronizationContextMode requiredMode) {
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// The output of this function will be a message like this:
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// "What you're trying to do is unsupported. Follow these steps to resolve it. For more
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// info, see this URL."
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string resolutionMessage;
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if (HttpRuntime.TargetFramework < VersionUtil.Framework45 && requiredMode == SynchronizationContextMode.Normal) {
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// upgrade to 4.5 mode
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resolutionMessage = SR.SynchronizationContextUtil_UpgradeToTargetFramework45Instructions;
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}
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else if (HttpRuntime.TargetFramework >= VersionUtil.Framework45 && requiredMode == SynchronizationContextMode.Legacy) {
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// already in 4.5 mode, add the back-compat switch
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resolutionMessage = SR.SynchronizationContextUtil_AddDowngradeAppSettingsSwitch;
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}
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else {
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// remove the <appSettings> switch
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resolutionMessage = SR.SynchronizationContextUtil_RemoveAppSettingsSwitch;
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}
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return SR.GetString(specificErrorMessage)
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+ " " + SR.GetString(resolutionMessage)
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+ "\r\n" + SR.GetString(SR.SynchronizationContextUtil_ForMoreInformation);
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}
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public static void ValidateMode(SynchronizationContextMode currentMode, SynchronizationContextMode requiredMode, string specificErrorMessage) {
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Debug.Assert(specificErrorMessage != null);
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if (currentMode != requiredMode) {
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string errorMessage = FormatErrorMessage(specificErrorMessage, requiredMode);
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throw new InvalidOperationException(errorMessage);
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}
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}
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public static void ValidateModeForAspCompat() {
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ValidateMode(
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currentMode: CurrentMode,
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requiredMode: SynchronizationContextMode.Legacy,
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specificErrorMessage: SR.SynchronizationContextUtil_AspCompatModeNotCompatible);
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}
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public static void ValidateModeForPageAsyncVoidMethods() {
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ValidateMode(
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currentMode: CurrentMode,
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requiredMode: SynchronizationContextMode.Normal,
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specificErrorMessage: SR.SynchronizationContextUtil_PageAsyncVoidMethodsNotCompatible);
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}
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public static void ValidateModeForWebSockets() {
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ValidateMode(
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currentMode: CurrentMode,
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requiredMode: SynchronizationContextMode.Normal,
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specificErrorMessage: SR.SynchronizationContextUtil_WebSocketsNotCompatible);
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}
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}
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}
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