public void CreateCopy_ReturnsNewInstance()
{
var syncContext = new SingleThreadedSynchronizationContext();
var other = syncContext.CreateCopy();
Assert.NotSame(syncContext, other);
// Verify that posting to the copy effectively gets the work to run on the original thread.
var frame = new SingleThreadedSynchronizationContext.Frame();
int?observedThreadId = null;
Task.Run(() =>
{
other.Post(
s =>
{
observedThreadId = Environment.CurrentManagedThreadId;
frame.Continue = false;
},
null);
});
syncContext.PushFrame(frame);
Assert.Equal(Environment.CurrentManagedThreadId, observedThreadId.Value);
}
public void Send_OnDifferentThread_ExecutesDelegateAndWaits_Throws()
{
int originalThreadId = Environment.CurrentManagedThreadId;
var syncContext = new SingleThreadedSynchronizationContext();
var frame = new SingleThreadedSynchronizationContext.Frame();
var task = Task.Run(delegate
{
try
{
var expectedException = new InvalidOperationException();
var actualException = Assert.Throws <TargetInvocationException>(() => syncContext.Send(s => throw expectedException, null));
Assert.Same(expectedException, actualException.InnerException);
}
finally
{
frame.Continue = false;
}
});
public void Send_OnDifferentThread_ExecutesDelegateAndWaits()
{
int originalThreadId = Environment.CurrentManagedThreadId;
var syncContext = new SingleThreadedSynchronizationContext();
var frame = new SingleThreadedSynchronizationContext.Frame();
var task = Task.Run(delegate
{
try
{
int?observedThreadId = null;
syncContext.Send(s => observedThreadId = Environment.CurrentManagedThreadId, null);
Assert.Equal(originalThreadId, observedThreadId);
}
finally
{
frame.Continue = false;
}
});
syncContext.PushFrame(frame);
task.GetAwaiter().GetResult();
}
