Question

我有ListBox，其中包含ContentMenu，如下所示：

<ListBox x:Name="lb_Configuration" SelectionMode="Single" SelectionChanged="lb_Configuration_SelectionChanged" ItemsSource="{Binding Products}" SelectedItem="{Binding SelectedProduct}" >
     <ListBox.ContextMenu>
          <ContextMenu>
               <MenuItem Header="Delete" Click="MenuItemDelete_Click"/>
               <MenuItem Header="Replace" Click="MenuItemReplace_Click"/>
               <MenuItem Header="Insert" Click="MenuItemInsert_Click"/>
          </ContextMenu>
     </ListBox.ContextMenu>                                                    
</ListBox>

当我想Delete中的ListBox项目时，private void MenuItemDelete_Click(object sender, RoutedEventArgs e) { Product itemToDelete = lb_Configuration.SelectedItem as Product; if (lb_Configuration.SelectedIndex < 0) return; else { lb_Configuration.Items.RemoveAt(lb_Configuration.SelectedIndex); } }

SelectedItem

现在问题是我还想替换列表框中的ContextMenu，所以我假设我还应该弹出ItemsSource并将SELECT sc FROM ShoppingCart sc JOIN sc.endUser as endUser WHERE endUser.name EQ someName and endUser.addressDetails.zip EQ 1234绑定到它？我怎么想这样做？提前谢谢！

Answer 1

您应该能够像删除方法一样删除旧条目。然后只需使用Items.InsertAt(Int32, Object)将项目插入到同一索引中。

例如，

private void MenuItemReplace_Click(object sender, RoutedEventArgs e)
{
     Product replacementProduct = new Product();
     // Grab the old index
     int index = lb_Configuration.SelectedIndex;
     // Do any product setup configuration here 

     if (index < 0) return;
     else
     {
         // Remove, insert, and refresh the ListBox
         lb_Configuration.Items.RemoveAt(index);
         lb_Configuration.Items.InsertAt(index, replacementProduct); 
         lb_Configuration.RefreshItems();
     }
}

如果您想了解更多详细信息，请查看ListBox.Items.InsertAt()

如何替换列表框中的项目？

1 个答案: