Remove the async/await warning CS1998, when implementing interface

Question

Suppose I implement an interface where there are two methods: Create and CreateAsync. The Async method in my case is not really async, and it uses the syncronous Create method to return the created object:

public Task<GrandeurDTO> CreateAsync()
{
    var dto = Create();
    return Task.FromResult(dto);
}
public GrandeurDTO Create()
{
    var bo = new Grandeur();

    var dto = _mapper.Map<GrandeurDTO>(bo);
    return dto;
}

How should I remove the warning

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(CS1998)

knowing I can't rename the method in Create (I already have one; cause if not the question is similar to this one)

Answer 1

I believe this is just a case of a tired Visual Studio and 1) a recompile or 2) VS restart will fix the issue.