wpf 使用 ItemsSource 时操作无效。改为使用 ItemsControl.ItemsSource 访问和修改元素。解析 XAML 时出错
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Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead. Error while parsing XAML
提问by Lee Louviere
I get a runtime error that crashes when it tries to parse my XAML.
我收到一个运行时错误，当它尝试解析我的XAML.
<TreeViewItem Header="{Binding Header}" ItemsSource="{Binding DataGroups}">
<ListView ItemsSource="{Binding DataGroups}">
<ListView.View>
<GridView>
<GridViewColumn Header="Group Name" DisplayMemberBinding="{Binding Path=Name}" />
<GridViewColumn Header="Group Type" DisplayMemberBinding="{Binding Path=Type}" />
</GridView>
</ListView.View>
</ListView>
</TreeViewItem>
采纳答案by Lee Louviere
After searching through all the questions related to this, I couldn't find the answer. Most involved people changing the Items property on the TreeViewItem, which will throw this error.
在搜索了与此相关的所有问题后，我找不到答案。大多数涉及人员更改 上的 Items 属性TreeViewItem，这将引发此错误。
In my case, I didn't change anything.
就我而言，我没有改变任何东西。
However, if you notice.
然而，如果你注意到了。
<TreeViewItem Header="{Binding Header}" ItemsSource="{Binding DataGroups}">
<ListView ItemsSource="{Binding DataGroups}">
I have bound to the same collection twice.
我已经两次绑定到同一个集合。
So, double check you haven't bound to the same collection twice if you get this error.
因此，如果出现此错误，请仔细检查您是否两次绑定到同一个集合。
![WPF 数据网格 [System.Windows.Data 错误：4]](/res/img/loading.gif)