public static void EnlistWithSyncContext_BeforeCancel_ThrowingExceptionInSyncContextDelegate_ThrowOnFirst()
{
ManualResetEvent mre_CancelHasBeenEnacted = new ManualResetEvent(false); //synchronization helper
CancellationTokenSource tokenSource = new CancellationTokenSource();
CancellationToken token = tokenSource.Token;
// Install a SynchronizationContext...
SynchronizationContext prevailingSyncCtx = SynchronizationContext.Current;
TestingSynchronizationContext testContext = new TestingSynchronizationContext();
SetSynchronizationContext(testContext);
// Main test body
ArgumentException caughtException = null;
// register a null delegate, but use the currently registered syncContext.
// the testSyncContext will track that it was used when the delegate is invoked.
token.Register(() => { throw new ArgumentException(); }, true);
Task.Run(
() =>
{
try
{
tokenSource.Cancel(true);
}
catch (ArgumentException ex)
{
caughtException = ex;
}
mre_CancelHasBeenEnacted.Set();
}
);
mre_CancelHasBeenEnacted.WaitOne();
Assert.True(testContext.DidSendOccur,
"EnlistWithSyncContext_BeforeCancel_ThrowingExceptionInSyncContextDelegate_ThrowOnFirst: the delegate should have been called via Send to SyncContext.");
Assert.NotNull(caughtException);
//Cleanup
SetSynchronizationContext(prevailingSyncCtx);
}
public static void EnlistWithSyncContext_BeforeCancel()
{
ManualResetEvent mre_CancelHasBeenEnacted = new ManualResetEvent(false); //synchronization helper
CancellationTokenSource tokenSource = new CancellationTokenSource();
CancellationToken token = tokenSource.Token;
// Install a SynchronizationContext...
SynchronizationContext prevailingSyncCtx = SynchronizationContext.Current;
TestingSynchronizationContext testContext = new TestingSynchronizationContext();
SetSynchronizationContext(testContext);
// Main test body
// register a null delegate, but use the currently registered syncContext.
// the testSyncContext will track that it was used when the delegate is invoked.
token.Register(() => { }, true);
Task.Run(
() =>
{
tokenSource.Cancel();
mre_CancelHasBeenEnacted.Set();
}
);
mre_CancelHasBeenEnacted.WaitOne();
Assert.True(testContext.DidSendOccur,
"EnlistWithSyncContext_BeforeCancel: the delegate should have been called via Send to SyncContext.");
//Cleanup.
SetSynchronizationContext(prevailingSyncCtx);
}
