CODEWITHSUNDEEP
c#xamarin.forms
user8393563
user8393563

Reputation:

Can someone explain me how I use Command(Action, CanExecute)

I want CanExecute to turn to true when my 5 entries are validated.

Right now I've got this which is binded to my send-button

SendCommand = new Command(() => SendData());

I got no idea how to use CanExecute and how to set this value to true when all 5 entries are validated.

Has somebody a reference or an advice?

Upvotes: 0

Views: 78

Answers (1)

user8393563
user8393563

Reputation:

I got it thanks to @Scott Chamberlain. Sorry for the dumb question .... it was as easy as you would expect.

SendCommand = new Command(() => SendData(),() => CanSend());

Edit: Make sure you add the EventHandler and raise him in the setters of your booleans.

public event EventHandler CanExecuteChanged;

I did it like that:

public bool CanExecute()
    {
        if (IsValid1 && IsValid2 && IsValid3 && IsValid4 && IsValid5)
        {
            return true;
        } else
        {
            return false;
        }
    }

and like 

public bool IsValid1 
    {
        get => _isvalid1;
        set
        {
            _isvalid1 = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsValid1)));
            ((Command)SendCommand).ChangeCanExecute();
        }
    }

Upvotes: 1

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