WPF 嵌套对象数据绑定
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WPF nested objects databinding
提问by crk1337
Hi I am having issues with understanding WPF databinding with nested objects.
嗨，我在理解嵌套对象的 WPF 数据绑定时遇到问题。
I have a workgroup class containing a List of User_activation objects called ListMembersand I would like to display its properties. How do I access its nested properties? This class contains another object called Userthat has its username and ultimately I would like to display the username in the combobox instead of WPF_test.User_activation.
我有一个包含名为ListMembers的 User_activation 对象列表的工作组类，我想显示其属性。如何访问其嵌套属性？这个类包含另一个名为User 的对象，它有它的用户名，最终我想在组合框中显示用户名而不是 WPF_test.User_activation。
Below is the XAML code and corresponding layout:
下面是 XAML 代码和相应的布局：
<ListView x:Name="ListViewWorkgroups" VerticalAlignment="Top" Height="Auto" Width="Auto" ItemsSource="{Binding listWorkgroups}">
<ListView.View>
<GridView>
<GridViewColumn Width="auto" Header="Workgroup" DisplayMemberBinding="{Binding Name}"></GridViewColumn>
<GridViewColumn Width="auto" Header="Skills">
<GridViewColumn.CellTemplate>
<DataTemplate>
<ComboBox IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding ListSkills}" ></ComboBox>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Width="auto" Header="Members">
<GridViewColumn.CellTemplate>
<DataTemplate >
<ComboBox IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding ListMembers}" ></ComboBox>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
Layout: http://i50.tinypic.com/ydy5h.png
布局：http: //i50.tinypic.com/ydy5h.png
Thank you!
谢谢！
回答by TimothyP
You need to set the ItemTemplate for the ComboBox
您需要为 ComboBox 设置 ItemTemplate
<ComboBox IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding ListMembers}" >
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding User.Username}"/>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
As an alternative, if you don't need anything complex you can bind the DisplayMemberPath
作为替代方案，如果您不需要任何复杂的东西，您可以绑定 DisplayMemberPath
<ComboBox IsSynchronizedWithCurrentItem="True" ItemsSource="{Binding ListMembers}" DisplayMemberPath="{Binding User.Username}"/>
You use the "." to access properties like you would in normal c# code
您使用“。” 像在普通 c# 代码中一样访问属性
回答by Travis Banger
This is just a follow-up to the previous answer. I just discovered that in Bindings, you may use a leading period in a filesystem fashion:
这只是对上一个答案的跟进。我刚刚发现在 Bindings 中，您可以以文件系统方式使用前导句点：
<ComboBox ItemsSource="{Binding .ListMembers}">
<DataTemplate>
<TextBlock Text="{Binding .User.Username}"/>
</DataTemplate>
That syntax adds nothing semantically, but in some cases makes the statement more readable (and XAML can certaintlyuse that!)
该语法在语义上没有添加任何内容，但在某些情况下使语句更具可读性（XAML肯定可以使用它！）
Here's a better example:
这是一个更好的例子：
<ComboBox ItemsSource="{Binding Caliber}" DisplayMemberPath=".Thickness" />
where Thicknessis a property of Caliber.
Thickness的属性在哪里Caliber。
