Casting in MVVM Light CommandParameterValue

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

이 항목과 관련된 문제입니다 검색에서 콘텐츠 유형을 무시하십시오

또는 이것이 도움이 될 수 있습니다 - isDocument : 1 http://www.dotnetmafia.com/blogs/dotnettipoftheday/archive/2009/08/26/excluding-folders-from-search-results.aspx

Answer 2

You can pass datatypes other than string to the command using the following syntax:

<i:EventTrigger EventName="MouseLeftButtonDown">
    <cmd:EventToCommand Command="{Binding ButtonPress}">
        <cmd:EventToCommand.CommandParameterValue>
            <s:Int32>1</s:Int32>
        </cmd:EventToCommand.CommandParameterValue>
    </cmd:EventToCommand>
</i:EventTrigger>

Add the flowing namespace declaration for s:

xmlns:s="clr-namespace:System;assembly=mscorlib"