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);
}