Generate source for RelayCommandAttribute on record as well

[virzak]

Overview

Records should also be able to generate RelayCommand just like classes do.

API breakdown

No new API

Usage example

Data layer has a record:

public record DataRecord(int Stuff, IList<int>ListOfStuff);

In the MVVM layer we want to provide commands to add or remove from the ListOfStuff:

public partial record DataRecordVM(DataRecord dr) : DataRecord(dr.Stuff, dr.ListOfStuff)
{
}

Inside DataRecordVM I'd like to add to the list

[RelayCommand]
private void Add(int newStuff) => ListOfStuff.Add(newStuff);

Breaking change?

No

Alternatives

The alternative is to instantiate RelayCommand by hand.

The other alternative is to use a class which has the record as its member, but it is too verbose:

public partial class DataClassVM(DataRecord dr)
{
    [RelayCommand]
    private void Add(int newStuff) => dr.ListOfStuff.Add(newStuff);

    // expose if necessary
    public IList<int> DataRecord => dr.ListOfStuff;
    public int Stuff => dr.Stuff;
}

Additional context

No response

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