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