CRR0033 - The void async method should be in a try/catch block | CodeRush

Apr 16, 2018

This analyzer detects asynchronous methods that returns nothing and does not catch the inner exceptions.

C#
VB.NET

async void DemoMethodAsync(CancellationToken token) {
    await Task.Run(() => { DemoMethodSync(); }, token).ConfigureAwait(false);
}

Async Sub DemoMethodAsync(token As CancellationToken)
    Await Task.Run(Sub() DemoMethodSync(), token).ConfigureAwait(False)
End Sub

The shown code can cause the app to crash because the exceptions thrown within a void async method cannot be caught from the outside — you should always catch them inside the method.

C#
VB.NET

async void DemoMethodAsync(CancellationToken token) {
    try {
        await Task.Run(() => { DemoMethodSync(); }, token).ConfigureAwait(false);
    } catch(Exception ex) {
        Console.WriteLine(ex);
    }
}

Async Sub DemoMethodAsync(token As CancellationToken)
    Try
        Await Task.Run(Sub() DemoMethodSync(), token).ConfigureAwait(False)
    Catch ex As Exception
        Console.WriteLine(ex)
    End Try
End Sub

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CRR0033 - The void async method should be in a try/catch block