MVVM Light RelayCommand Parameters

Question

I\'m having an issue with passing a parameter to a relaycommand using the GalaSoft MVVM Light framework. I know that mvvm light\'s implementation of relaycommand doesn\'t u

Answer 1

I don't think that RelayCommand() has a constructor that is not empty. you're trying to pass the wrong kind of method to it.

If you want the RelayCommand to support Command Parameters, you should use RelayCommand<T> where T can be any type of parameter. In your situation it would be RelayCommand<String> which would accept a method with void(string) signature. (and therefor would also be strongly typed and won't use the ugly object)

Answer 2

I believe this will work:

_projmenuItem_Edit = new RelayCommand<object>((txt)=>ProjEditNode(txt));

-- EDIT --

You'll need to define your RelayCommand with the type as well:

e.g.

public RelayCommand<string> myCommand { get; private set; }
myCommand = new RelayCommand<string>((s) => Test(s));

private void Test(string s)
{
    throw new NotImplementedException();
}

Answer 3

Another way to declare relay commands, will help to reduce your code

public RelayCommand ChartCommand
{
    set
    {
        RelayCommand<string> chartCommand = 
            new RelayCommand<string>(e => ExecuteChartCommand(e));               
    }
}

public void ExecuteChartCommand(string vendor)
{

}