WPF Combobox DisplayMemberPath [英] WPF Combobox DisplayMemberPath

问题描述

好吧，我看了其他问题，似乎没有得到我的回答，所以希望有人在这里可以。

很简单的问题为什么DisplayMemberPath属性不绑定到项目？

 < ComboBox Grid.Row =1Grid.Column =2ItemsSource ={Binding PromptList}DisplayMemberPath ={绑定名称}SelectedItem ={绑定提示}/> 
  

跟踪输出显示它试图绑定到持有IEnumerable而不是实际项目的类IEnumerable。我困惑为一个简单的方法来填充组合框，而不添加一行在xaml。

它只是为itemssource中的对象调用ToString（）。我有一个工作是这样的：

 < ComboBox Grid.Row =1Grid.Column =2 ItemsSource ={Binding PromptList}SelectedItem ={Binding Prompt}> 
< ComboBox.ItemTemplate> 
< DataTemplate> 
< TextBlock Text ={Binding Name}/> 
< / DataTemplate> 
< /ComboBox.ItemTemplate> 
< / ComboBox> 
  

但在我看来，这太简单了。我可以使用relativesource绑定吗？

解决方案

DisplayMemberPath 每个项目的显示字符串属性。在您的情况下，您可以将它设置为Name，而不是{Binding Name} p>

Ok, I looked at other questions and didn't seem to get my answer so hopefully someone here can.

Very simple question why does the DisplayMemberPath property not bind to the item?

<ComboBox Grid.Row="1" Grid.Column="2" ItemsSource="{Binding PromptList}" DisplayMemberPath="{Binding Name}" SelectedItem="{Binding Prompt}"/>

The trace output shows that it is trying to bind to the class holding the IEnumerable not the actual item in the IEnumerable. I'm confused as to a simple way to fill a combobox without adding a bunch a lines in xaml.

It simply calls the ToString() for the object in itemssource. I have a work around which is this:

<ComboBox Grid.Row="1" Grid.Column="2" ItemsSource="{Binding PromptList}"  SelectedItem="{Binding Prompt}">
    <ComboBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Name}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

But in my opinion it's too much for such a simple task. Can I use a relativesource binding?

解决方案

DisplayMemberPath specifies the path to the display string property for each item. In your case, you'd set it to "Name", not "{Binding Name}".

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