.net DisplayMemberPath 串联
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DisplayMemberPath concatenation
提问by unairoldan
I am trying to bind two values to a ComboBox display value, but I do not know how to do.
我试图将两个值绑定到一个 ComboBox 显示值，但我不知道该怎么做。
This way does not work:
这种方式不起作用：
cboRegion.DisplayMemberPath = "idregion" + "description";
Does anyone know how to do that in C#?
有谁知道如何在 C# 中做到这一点？
回答by Heinzi
Unfortunately, this is not possible with DisplayMemberPath. You have the following alternatives:
不幸的是，这是不可能的DisplayMemberPath。您有以下选择：
Specify a DataTemplate
<ComboBox> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock> <TextBlock.Text> <MultiBinding StringFormat="{}{0}: {1}"> <Binding Path="idregion"/> <Binding Path="description"/> </MultiBinding> </TextBlock.Text> </TextBlock> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox>(If you are wondering about the empty braces in the StringFormat attribute, see: What do the {} brackets mean in the StringFormat section of a Binding syntax?)
Add a property or field to your data source. How to do that depends on your data source:
If your combo box is bound to a DataTable, add a DataColumn and fill its values in a loop. Alternatively, change your SQL and add the concatenated value to your
SELECTclause.If your combo box is bound to a POCO or entity framework object, add a property that returns the concatenation.
指定数据模板
<ComboBox> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock> <TextBlock.Text> <MultiBinding StringFormat="{}{0}: {1}"> <Binding Path="idregion"/> <Binding Path="description"/> </MultiBinding> </TextBlock.Text> </TextBlock> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox>（如果您想知道 StringFormat 属性中的空大括号，请参阅：绑定语法的 StringFormat 部分中的 {} 括号是什么意思？）
向数据源添加属性或字段。如何做到这一点取决于您的数据源：
如果您的组合框绑定到 DataTable，请添加一个 DataColumn 并在循环中填充其值。或者，更改您的 SQL 并将串联值添加到您的
SELECT子句中。如果您的组合框绑定到 POCO 或实体框架对象，请添加一个返回串联的属性。
回答by Thomas Levesque
You need to use a DataTemplate:
你需要使用一个DataTemplate：
<ComboBox Name="cboRegion">
<ComboBox.ItemTemplate>
<DataTemplate>
<TextBlock>
<Run Text="{Binding idregion}" />
<Run Text="{Binding description}" />
</TextBlock>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
回答by user3542322
You could create a view, concatenate the two fields, and then refer to the concatenated field name in your DisplayMemberPath property in c#, after referring to the new view in your itemssource property (and after updating your entity framework model)
您可以创建一个视图，连接两个字段，然后在引用 itemssource 属性中的新视图后（以及更新实体框架模型后）在 c# 中的 DisplayMemberPath 属性中引用连接的字段名称
