CRR0053 - Missing 'await'

• May 21, 2025
• 2 minutes to read

This analyzer identifies places where an async method should be awaited to avoid issues with exception handling and premature object disposal:

C#

public Task<T> Handle(T request, CancellationToken cancellationToken) {
    using var handler = HandlerFactory.CreateRequestHandler(request);
    return ExecuteHandlerAsync<T>(handler, cancellationToken);  // <-- CRR0053 reported for the ExecuteHandlerAsync(...) call
}

public Task<T> ExecuteHandlerAsync<T>(Handler<T> handler, CancellationToken cancellationToken) {
    // A long running operation that utilizes handler object
}

VB.NET

Public Function Handle(ByVal request As T, ByVal cancellationToken As CancellationToken) As Task(Of T)
    Using handler = HandlerFactory.CreateRequestHandler(request)
        ' CRR0053 reported for the ExecuteHandlerAsync(...) call:
        Return ExecuteHandlerAsync(Of T)(handler, cancellationToken) 
    End Using
End Function

Public Function ExecuteHandlerAsync(Of T)(ByVal handler As Handler(Of T), ByVal cancellationToken As CancellationToken) As Task(Of T)
    ' A long running operation that utilizes handler object
End Function

To fix this warning, add the await operator to the method call:

C#

public async Task<T> Handle(T request, CancellationToken cancellationToken) {
    using var handler = HandlerFactory.CreateRequestHandler(request);
    return await ExecuteHandlerAsync<T>(handler, cancellationToken).ConfigureAwait(false);  // <-- CRR0053 no longer reported for the ExecuteHandlerAsync(...) call
}

public Task<T> ExecuteHandlerAsync<T>(Handler<T> handler, CancellationToken cancellationToken) {
    // A long running operation that utilizes handler object
}

VB.NET

Public Async Function Handle(ByVal request As T, ByVal cancellationToken As CancellationToken) As Task(Of T)
    Using handler = HandlerFactory.CreateRequestHandler(request)
        ' CRR0053 no longer reported for the ExecuteHandlerAsync(...) call:
        Return Await ExecuteHandlerAsync(Of T)(handler, cancellationToken).ConfigureAwait(False) 
    End Using
End Function

Public Function ExecuteHandlerAsync(Of T)(ByVal handler As Handler(Of T), ByVal cancellationToken As CancellationToken) As Task(Of T)
    ' A long running operation that utilizes handler object
End Function