无法在silverlight中输出类型问题

Question

点击按钮后，我收到此错误。

http://cid-3dbfac44f49def30.skydrive.live.com/self.aspx/New%20album/error.JPG

这是我的代码

<sdk:DataGrid MinHeight="100" x:Name="dgCounty" AutoGenerateColumns="False"
 VerticalAlignment="Top"  IsReadOnly="True"  Margin="5,5,5,0"
 RowDetailsVisibilityChanged="dgCounty_RowDetailsVisibilityChanged"
 RowDetailsVisibilityMode="VisibleWhenSelected">
 <sdk:DataGrid.Columns>
   <data:DataGridTemplateColumn.CellTemplate>
     <DataTemplate>
        <Button Content="+" Click="Button_Click"></Button>
     </DataTemplate>
   </data:DataGridTemplateColumn.CellTemplate>
   <sdk:DataGridTextColumn Header="Countryname" Width="100"
     Binding="{Binding Region Name}" CanUserReorder="False"/>
     <sdk:DataGridTextColumn Header="Populution" Width="80"
       Binding="{Binding Number Of People}" CanUserReorder="False"/>
     </sdk:DataGrid.Columns>
     <sdk:DataGrid.RowDetailsTemplate>
       <DataTemplate>
         <sdk:DataGrid x:Name="dgrdRowDetail" Width="400" AutoGenerateColumns="False"
           HorizontalAlignment="Center" IsReadOnly="True" Grid.Row="1">
           <sdk:DataGrid.Columns>
             <sdk:DataGridTextColumn Header="county" Binding="{Binding CompanyName}" />
             <sdk:DataGridTextColumn Header="Number Of People" Binding="{Binding CompanyID}"/>
           </sdk:DataGrid.Columns>
         </sdk:DataGrid>
       </DataTemplate>
     </sdk:DataGrid.RowDetailsTemplate>
   </sdk:DataGrid>

代码： -

private void Button_Click(object sender, RoutedEventArgs e)
        {
            Button btnExpandCollapse = sender as Button;

            var Row = DataGridRow.GetRowContainingElement(sender as FrameworkElement);
            if (Row.DetailsVisibility == Visibility.Collapsed)
            {
                Row.DetailsVisibility = Visibility.Visible;
            }
            else
            {
                Row.DetailsVisibility = Visibility.Collapsed;
            }



            if (btnExpandCollapse.Content.ToString() == "+")
            {
                btnExpandCollapse.Content = "-";
            }
            else if (btnExpandCollapse.Content.ToString() == "-")
            {
                btnExpandCollapse.Content = "+";
            }


        }

 void dtg_RowDetailsVisibilityChanged(object sender, DataGridRowDetailsEventArgs e)
        {

            DataGrid RowDetails = e.DetailsElement as DataGrid

            if(RowDetails.YourDesiciveFlag = true)
            {

            }
             else
              {

            }


        }
}

过去3天处理此问题  任何想法如何解决这个问题。只是对这个问题发疯了。   用于silverlight数据网格中的扩展/ collpase。

如果有人能为我提供任何可以解决我问题的代码，请告诉我。

提前谢谢  王子

Answer 1

从代码的外观来看，你正在尝试做我在这里展示的内容：

http://gallery.expression.microsoft.com/en-us/ToggleRowDetail

希望代码示例（行为）可以帮助您。 迈克尔