组合框打开时从 ObjectDataProvider 获取数据

发布于 2024-07-24 08:33:30 字数 579 浏览 5 评论 0原文

如何让 ObjectDataProvider 在每次展开组合框而不是仅展开一次时触发？

<UserControl.Resources>
    <ObjectDataProvider x:Key="possibleExpressionValues"
                MethodName="GetWatchVariableNames" 
                ObjectType="{x:Type mu:UserInterfaceHelper}" IsInitialLoadEnabled="False">
    </ObjectDataProvider>
</UserControl.Resources>

<Grid>
    <ComboBox IsEditable="True" Text="{Binding ID}" ItemsSource="{Binding Source={StaticResource possibleExpressionValues}}" VerticalAlignment="Top" />
</Grid>

原文

How do I go about getting an ObjectDataProvider to get triggered each time a combo box is expanded instead of just one time?

<UserControl.Resources>
    <ObjectDataProvider x:Key="possibleExpressionValues"
                MethodName="GetWatchVariableNames" 
                ObjectType="{x:Type mu:UserInterfaceHelper}" IsInitialLoadEnabled="False">
    </ObjectDataProvider>
</UserControl.Resources>

<Grid>
    <ComboBox IsEditable="True" Text="{Binding ID}" ItemsSource="{Binding Source={StaticResource possibleExpressionValues}}" VerticalAlignment="Top" />
</Grid>

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

醉殇 2024-07-31 08:33:30

当 ObjectDataProvider 被触发时，您是否想要创建一个新的 UserInterfaceHelper 对象？

在这种情况下，将组合框的 DropDownOpened 事件连接到以下方法。

private void ComboBox_DropDownOpened(object sender, EventArgs e)
{
  ObjectDataProvider odp = Resources["possibleExpressionValues"] as ObjectDataProvider;
  odp.ObjectType = null;
  odp.ObjectInstance = new UserInterfaceHelper();
}

With ObjectDataProvider get triggered, do you mean you want a fresh UserInterfaceHelper object created?

In that case, hook up the DropDownOpened event of the combobox to following method.

private void ComboBox_DropDownOpened(object sender, EventArgs e)
{
  ObjectDataProvider odp = Resources["possibleExpressionValues"] as ObjectDataProvider;
  odp.ObjectType = null;
  odp.ObjectInstance = new UserInterfaceHelper();
}

回复收藏 0 原文

~没有更多了~