public void TargetsCurrentSynchronizationContext()
{
RunWithoutSyncCtx(() =>
{
var tsc = new TrackingSynchronizationContext();
SynchronizationContext.SetSynchronizationContext(tsc);
Progress<int> p = new Progress<int>(i => { });
for (int i = 0; i < 3; i++)
((IProgress<int>)p).Report(i);
Assert.Equal(3, tsc.Posts);
SynchronizationContext.SetSynchronizationContext(null);
});
}
public void NoWorkQueuedIfNoHandlers()
{
RunWithoutSyncCtx(() =>
{
var tsc = new TrackingSynchronizationContext();
SynchronizationContext.SetSynchronizationContext(tsc);
Progress<int> p = new Progress<int>();
for (int i = 0; i < 3; i++)
((IProgress<int>)p).Report(i);
Assert.Equal(0, tsc.Posts);
SynchronizationContext.SetSynchronizationContext(null);
});
}
public static void SynchronizationContextCurrent_NotUsedForAsyncOperations()
{
Task.Run(() =>
{
var sc = new TrackingSynchronizationContext();
SynchronizationContext.SetSynchronizationContext(sc);
using (XmlReader reader = XmlReader.Create(new DribbleReadXmlAsyncStream(_dummyXml), new XmlReaderSettings {
Async = true,
}))
{
while (reader.ReadAsync().GetAwaiter().GetResult())
{
;
}
}
Assert.True(sc.CallStacks.Count == 0, "Sync Ctx used: " + string.Join(Environment.NewLine + Environment.NewLine, sc.CallStacks));
}).GetAwaiter().GetResult();
}
public async Task ConfiguredAwaiter_ContinuesOnCapturedContext(bool continueOnCapturedContext)
{
await Task.Run(() =>
{
var tsc = new TrackingSynchronizationContext();
SynchronizationContext.SetSynchronizationContext(tsc);
try
{
ValueTask <int> t = new ValueTask <int>(42);
var mres = new ManualResetEventSlim();
t.ConfigureAwait(continueOnCapturedContext).GetAwaiter().OnCompleted(() => mres.Set());
Assert.True(mres.Wait(10000));
Assert.Equal(continueOnCapturedContext ? 1 : 0, tsc.Posts);
}
finally
{
SynchronizationContext.SetSynchronizationContext(null);
}
});
}
public async Task ConfiguredAwaiter_ContinuesOnCapturedContext(bool continueOnCapturedContext)
{
await Task.Run(() =>
{
var tsc = new TrackingSynchronizationContext();
SynchronizationContext.SetSynchronizationContext(tsc);
try
{
ValueTask<int> t = 42;
var mres = new ManualResetEventSlim();
t.ConfigureAwait(continueOnCapturedContext).GetAwaiter().OnCompleted(() => mres.Set());
Assert.True(mres.Wait(10000));
Assert.Equal(continueOnCapturedContext ? 1 : 0, tsc.Posts);
}
finally
{
SynchronizationContext.SetSynchronizationContext(null);
}
});
}
