Func syntax for async call

Question

I try to create an AsyncCommand with a parameter.

I used this method but it's not working.

 public static AsyncCommand<T> Create(Func<System.Threading.Tasks.Task<T>> func)
    {

        return new AsyncCommand<T>(new Command<T>(async (x) =>  await func(x)));
    }

And when I call it with my viewmodel:

 public ICommand OnRemoveTagCommand = AsyncCommand<ResultElementRatingDto>.Create(RemoveTag);

 private async Task<ResultElementRatingDto> RemoveTag(ResultElementRatingDto ratingDto)
    {

        return null;
    }

The error is:

cannot convert from 'method group' to 'Func'

What's wrong in my code?

Comes from a binding with command parameter of a listview datatemplate Command="{ Binding OnRemoveTagCommand}" CommandParameter="{ Binding . }" — dalton5
– dalton5, Commented Feb 19, 2020 at 23:51
You could define the command directly like OnRemoveTagCommand= new Command(async(obj) => {}); — Lucas Zhang
– Lucas Zhang, Commented Feb 20, 2020 at 1:45

Stephen Cleary · Accepted Answer · 2020-02-20 02:01:15Z

2

Depending on the overloads of Create that are available, and depending on the language version you're using, the compiler sometimes cannot resolve a method group to an unambiguous overload when only considering return types. In that case, call the method with a lambda expression:

public ICommand OnRemoveTagCommand = AsyncCommand<ResultElementRatingDto>.Create(x => RemoveTag(x));

answered Feb 20, 2020 at 2:01

Stephen Cleary

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