ContinueWith不处理异步回调吗？

Question

I saw Stephen Cleary's blog about Startnew being dangerous and how continuewith is also dangerous . I wanted to use it here to avoid having to write a try finally just to make a call to NSubstitute in the case of an exception. I found the Test passed when it shouldn't have and then noticed that the exception was thrown but it didn't make it out of the test to signal nunit.

Does ContinueWith act similarly to Task.Startnew with respect to async functions? I noticed this simplified equivalent will not throw the inner exception in Nunit 3.

[Test]
public async Task SimpleTest()
{
    await Task.Delay(10).ContinueWith( async t =>
    {
        await Task.Run(()=>{throw new Exception();});
    });
}

Answer 1

ContinueWith does not understand async lambdas. You would need to use Unwrap in addition to passing a task scheduler.

I wanted to use it here to avoid having to write a try finally just to make a call to NSubstitute in the case of an exception.

I don't understand this requirement. Why wouldn't this work?

await Task.Delay(10);
await Task.Run(() => { throw new Exception(); });