Question

请解释为什么这样做不可行。

 <ContextMenu>     
      <MenuItem>
          <MenuItem.Header>
               <TextBox Name="tbColor" Text="Black" />
          </MenuItem.Header>
          <MenuItem.Icon>
               <TextBox Text="{Binding ElementName=tbColor,Path=Text}" />
          </MenuItem.Icon>                                                                    
      </MenuItem>
 </ContextMenu>

I have tried several ways but nothing. RelativeSource doesn t work..

Edit. binding from another control work.

<DataGrid Foreground="{Binding ElementName=tbColor,Path=Text,Converter={StaticResource textToBrushConverter}}">          
        <DataGrid.ContextMenu>
            <ContextMenu>....

Answer 1

最初的法典就是这样,只是为了我自己的先辈。

<MenuItem.Header>
   <TextBox Name="tbColor" Text="Black" TextChanged="tbColor_TextChanged" />
</MenuItem.Header>
<MenuItem.Icon>
   <Rectangle Name="rectangleColor" Width="20" Height="20" />
</MenuItem.Icon>

And in code behind..

private void tbColor_TextChanged(object sender, TextChangedEventArgs e)
    {
        try
        {
            rectangleColor.Fill = new SolidColorBrush((Color) ColorConverter.ConvertFromString(((TextBox) sender).Text));
        }
        catch (Exception)
        {
            return;
        }
    }

Answer 2

Header a MenuItem 的财产实际上正在寻找一种扼杀。可在<代码>Header内安装<代码>TextBlock,但不得在上安装<代码>。

尽管我已经深入审视了这个问题,但我怀疑,<代码>I上的同样(除图像外)情况是<代码>。

Answer 3

Context menu outside the visual tree of your control so can t find element name. Try -

{Binding PlacementTarget, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContextMenu}}}"

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