The current SynchronizationContext may not be used as a TaskScheduler

Question

I am using Tasks to run long running server calls in my ViewModel and the results are marshalled back on Dispatcher using TaskScheduler.FromSyncronizationContext(). For example:

var context = TaskScheduler.FromCurrentSynchronizationContext();
this.Message = "Loading...";
Task task = Task.Factory.StartNew(() => { ... })
            .ContinueWith(x => this.Message = "Completed"
                          , context);

This works fine when I execute the application. But when I run my NUnit tests on Resharper I get the error message on the call to FromCurrentSynchronizationContext as:

The current SynchronizationContext may not be used as a TaskScheduler.

I guess this is because the tests are run on worker threads. How can I ensure the tests are run on main thread ? Any other suggestions are welcome.

Answer 1

You need to provide a SynchronizationContext. This is how I handle it:

[SetUp]
public void TestSetUp()
{
  SynchronizationContext.SetSynchronizationContext(new SynchronizationContext());
}