public static void MainThreadEntrypoint(Func <Task> mainThreadEntrypoint)
{
UIDispatcherMock syncContext = new UIDispatcherMock();
SynchronizationContext oldSyncContext = Current;
SetSynchronizationContext(syncContext);
Exception unhandledException = null;
syncContext.Post(
async state =>
{
try
{
await mainThreadEntrypoint?.Invoke();
}
catch (Exception ex)
{
unhandledException = ex;
}
finally
{
syncContext.Continue = false;
}
},
null);
syncContext.Loop();
SetSynchronizationContext(oldSyncContext);
if (unhandledException != null)
{
ExceptionDispatchInfo.Capture(unhandledException).Throw();
}
}
public void OpenFileForRead_NoHangForSync()
{
// Simulate the UI thread of an app.
UIDispatcherMock.MainThreadEntrypoint(delegate
{
// Arrange
IFolder folder = TestFileSystem.LocalStorage;
string fileName = "fileToOpenForRead.txt";
IFile file = folder.CreateFileAsync(fileName, CreationCollisionOption.FailIfExists).Result;
// Act
using (Stream stream = file.OpenAsync(FileAccess.Read).Result)
{
// Assert
Assert.IsFalse(stream.CanWrite);
Assert.IsTrue(stream.CanRead);
Assert.IsTrue(stream.CanSeek);
}
// Cleanup
file.DeleteAsync().Wait();
});
}
