48 lines
1.8 KiB
C#
48 lines
1.8 KiB
C#
namespace System.Web.Mvc.Async {
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Threading;
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internal static class SynchronizationContextUtil {
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public static SynchronizationContext GetSynchronizationContext() {
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// In a runtime environment, SynchronizationContext.Current will be set to an instance
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// of AspNetSynchronizationContext. In a unit test environment, the Current property
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// won't be set and we have to create one on the fly.
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return SynchronizationContext.Current ?? new SynchronizationContext();
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}
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "The exception is swallowed and immediately re-thrown")]
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public static T Sync<T>(this SynchronizationContext syncContext, Func<T> func) {
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T theValue = default(T);
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Exception thrownException = null;
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syncContext.Send(o =>
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{
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try {
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theValue = func();
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}
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catch (Exception ex) {
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// by default, the AspNetSynchronizationContext type will swallow thrown exceptions,
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// so we need to save and propagate them
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thrownException = ex;
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}
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}, null);
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if (thrownException != null) {
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throw Error.SynchronizationContextUtil_ExceptionThrown(thrownException);
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}
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return theValue;
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}
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public static void Sync(this SynchronizationContext syncContext, Action action) {
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Sync<AsyncVoid>(syncContext, () =>
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{
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action();
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return default(AsyncVoid);
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});
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}
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}
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}
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