ListBox中删除项 [英] ListBox Item Removal

问题描述

我有一个管理组配置的WPF窗口，它允许用户编辑配置集（编辑按钮），删除配置集（删除按钮）。该窗口中有一个ListBox控件按名称列出配置集和它的ItemsSource有一个绑定集到的配置集列表。

I have a WPF window that manages sets of configurations and it allows users to edit a configuration set (edit button) and to remove a configuration set (remove button). The window has a ListBox control that lists the configuration sets by name and its ItemsSource has a binding set to a list of configuration sets.

我试图删除的项在代码隐藏文件的窗口。

I'm trying to remove the item in the code behind file for the window..

private void RemoveButton_Click(object sender, RoutedEventArgs e)
{
    var removedItems = configSetListBox.SelectedItems;

    foreach(ConfigSet removedItem in removedItems)
    {
        configSetListBox.Items.Remove(removedItem);
    }
}

我的代码产生一个无效操作异常，指出访问和修改与ItemsControl.ItemsSource而不是元素。我应该是什么性质的访问，以properlyremove从ListBox中的项目？还是有可能在WPF来处理这更优雅的方式？我的实现是一个有点WinForm的十岁上下，如果你会：）

My code yields an invalid operation exception stating "Access and modify elements with ItemsControl.ItemsSource instead." What property should I be accessing to properlyremove items from the ListBox? Or is there possibly a more elegant way to handle this in WPF? My implementation is a bit WinForm-ish if you will :)

解决方案

private void RemoveButton_Click(object sender, RoutedEventArgs e)
{   
    foreach(ConfigSet removedItem in configSetListBox.SelectedItems)
    {
        (configSetListBox.ItemsSource as List<ConfigSet>).Remove(removedItem);
    }
    configSetListBox.Items.Refresh();
}

在我来说，我有一个List作为的ItemSource绑定类型，所以我不得不投这种方式。无刷新项集合，列表框不更新; 。所以这是必要我的解决方案

In my case I had a List as the ItemSource binding type so I had to cast it that way. Without refreshing the Items collection, the ListBox doesn't update; so that was necessary for my solution.

推荐答案

使用：

private void RemoveButton_Click(object sender, RoutedEventArgs e)
{
  foreach(ConfigSet item in this.configSetListBox.SelectedItems)
  {
      this.configSetListBox.ItemsSource.Remove(item); // ASSUMING your ItemsSource collection has a Remove() method
  }
}

注：我使用的这一点。就是如此，因为它是更为明确 - 这也有助于一见的对象是在类命名空间中我们在方法而非变量 - 尽管很明显这里

Note: my use of this. is just so it as it is more explicit - it also helps one see the object is in the class namespace as opposed to variable in the method we are in - though it is obvious here.

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