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VSTHRD103 Call async methods when in an async method

In a method which is already asynchronous, calls to other methods should be to their async versions, where they exist.

Examples of patterns that are flagged by this analyzer

Task DoAsync()
{
    file.Read(buffer, 0, 10);
}

All methods where an Async-suffixed equivalent exists will produce this warning when called from a Task-returning method. In addition, calling Task.Wait(), Task<T>.Result or Task.GetAwaiter().GetResult() will produce this warning.

Solution

Await the async version of the method:

async Task DoAsync()
{
    await file.ReadAsync(buffer, 0, 10);
}

Configuration

This analyzer can be configured to exclude specific APIs from generating diagnostics. Some APIs may have async versions that are less efficient or inappropriate for certain use cases.

See our configuration topic to learn how to exclude specific methods using the vs-threading.SyncMethodsToExcludeFromVSTHRD103.txt file.

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