Question

here is my Problem, I want to pass the integer 1 when this canvas is pressed. Every time I click the canvas, I get a An unhandled exception of type ‘System.InvalidCastException’ occurred in GalaSoft.MvvmLight.dll. Now I could make my life easier and just do the RelayCommand to accept a String instead of int but for the sake of learning. How would i go about doing it this way,

    <i:Interaction.Triggers>
   <i:EventTrigger EventName="MouseLeftButtonDown">
         <cmd:EventToCommand Command="{Binding ButtonPress}"
                 CommandParameterValue="1"
              </i:EventTrigger>
    </i:Interaction.Triggers>

Answer 1

You just found a limitation of the generic casting. I am sorry about this. I will try to find a better way to handle simple values in a further version (maybe with some reflection to check if the Parse method is present on the type) and opened a bug in my backlog. In the mean time, please use RelayCommand and do the parsing yourself.

Cheers,
Laurent