从XAML传递命令参数 [英] Pass command parameter from the xaml

问题描述

我尝试做这样的事情：

 ＆LT; D​​ataGrid的名称=myGrid的ItemSource ={绑定路径= MyCollection的}＆GT;
   ＆LT; D​​ataGrid.ContextMenu＆GT;
       ＆LT;＆文本菜单GT;
          ＆LT;菜单项
              命令={结合RemoveRow}
              CommandParameter ={绑定的ElementName = myGrid，路径=的SelectedItem}＆GT;
       ＆LT; /文本菜单＆GT;
   ＆LT; / DataGridContextMenu＆GT;
＆LT; / DataGrid的＆GT;
 

但我得到空总是（我也试过和的SelectedIndex的SelectedValue）

如果我通过以下参数来执行code，它的工作原理：

 ＆LT;菜单项命令={结合RemoveRow}CommandParameter =1＆GT;
 

解决方案

尝试这样的事情在你的CommandParameter，

 ＆LT; D​​ataGrid.ContextMenu＆GT;
     ＆LT;＆文本菜单GT;
           ＆LT;菜单项标题=MyHeader
                     命令={结合MyCommand}
                     CommandParameter ={绑定的RelativeSource = {的RelativeSource FindAncestor，AncestorType = {X：类型的ContextMenu}}，路径= PlacementTarget.SelectedItem}/＆GT;
＆LT; /DataGrid.ContextMenu>
 

我已经测试了它，它应该工作。

I try to do something like this:

<DataGrid Name="myGrid" ItemSource="{Binding Path=MyCollection}">
   <DataGrid.ContextMenu>
       <ContextMenu>
          <MenuItem 
              Command="{Binding RemoveRow}" 
              CommandParameter="{Binding ElementName=myGrid, Path=SelectedItem}">
       </ContextMenu>
   </DataGridContextMenu>
</DataGrid>

but I got null always (I tried also SelectedIndex and SelectedValue)

if I pass the following parameter to the execution code, it works:

<MenuItem Command="{Binding RemoveRow}" CommandParameter="1">

解决方案

Try something like this in your CommandParameter,

<DataGrid.ContextMenu>
     <ContextMenu>
           <MenuItem Header="MyHeader" 
                     Command="{Binding MyCommand}"
                     CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContextMenu}}, Path=PlacementTarget.SelectedItem}" />
</DataGrid.ContextMenu>

I already tested it and it should work.

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