WPF：自动完成框选定项

发布于 2024-11-05 06:18:51 字数 940 浏览 0 评论 0原文

我有一个对象绑定到窗口中的控件。该对象有一个名为“Region”的属性，以及一个填充了可用“Regions”列表的 ObjectDataProvider。我正在使用 WPF 工具包 AutoCompleteBox 来选择所选区域，但所选值不会更新以反映对象的区域。例如：如果我使用下面的代码，我可以打开/保存表单，并且 AutoCompleteBox 显示为空白，即使该区域已保存（因此它必须绑定，但不可见？）

<input:AutoCompleteBox x:Name="txtRegionAuto" Grid.Row="0" Grid.Column="1" 
IsTextCompletionEnabled="False" ValueMemberPath="Region"   ItemTemplate="{StaticResource RegionDataTemplate}" Margin="2,4" Style="{StaticResource AutoCompleteComboBoxStyle}" TabIndex="8" SelectedItem="{Binding Region,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" 
SelectionChanged="lstRegion_SelectionChanged" 
ItemsSource="{Binding Source={StaticResource regionProvider}}" MinimumPopulateDelay="400" />

我可以让该区域显示的唯一方法该框是：

txtRegionAuto.SelectedItem = regions.FirstOrDefault(c => c.RegionID == region.RegionID);

但是当我保存表单时，我的对象上的 Region 属性为空。我确信这只是设置正确的值绑定的情况，但我不确定要使用什么。

原文

I have an object bound to controls in a window. There's a property on this object called "Region", and an ObjectDataProvider which is populated with a list of available "Regions". I'm using a WPF toolkit AutoCompleteBox to select the region selected but the value selected isn't update to reflect the region of the object. Eg: If I use the code below, I can open/save the form and the AutoCompleteBox appears blank, even though the region is saved (so it must be bound, but invisible?)

<input:AutoCompleteBox x:Name="txtRegionAuto" Grid.Row="0" Grid.Column="1" 
IsTextCompletionEnabled="False" ValueMemberPath="Region"   ItemTemplate="{StaticResource RegionDataTemplate}" Margin="2,4" Style="{StaticResource AutoCompleteComboBoxStyle}" TabIndex="8" SelectedItem="{Binding Region,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" 
SelectionChanged="lstRegion_SelectionChanged" 
ItemsSource="{Binding Source={StaticResource regionProvider}}" MinimumPopulateDelay="400" />

The only way I can get the region to display in the box is with:

txtRegionAuto.SelectedItem = regions.FirstOrDefault(c => c.RegionID == region.RegionID);

But then when I come to save the form, the Region property on my object is null. I'm sure it's just a case of setting the right value binding, but I'm not sure what to use.

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