实体图绑定无法在深层工作
的实体图
假设我有像People ->Student 这样
，那么在 xaml 中，我有以下类型的绑定（People 是 VM 的属性）：
<TextBox Text="{Binding People.Name, Mode=TwoWay}" />
<TextBox Text="{Binding People.Student.StudentNo, Mode=TwoWay}" /> <!-- this bounding is not working -->
在 VM 中，实现 IEditableObject。我有一些代码，例如：
public void BeginEdit()
{
((IEditableObject)this.People).BeginEdit();
((IEditableObject)this.People.Student).BeginEdit(); //this code not working
//....
}
运行应用程序时，绑定到人员的所有数据都很好。
绑定到学生的所有数据都不起作用。
如何修复它？
Suppose I have entity graph like
People ->Student
then in xaml, I have following kind of binding(People is property of VM):
<TextBox Text="{Binding People.Name, Mode=TwoWay}" />
<TextBox Text="{Binding People.Student.StudentNo, Mode=TwoWay}" /> <!-- this bounding is not working -->
in VM, implementing IEditableObject. I have some code like:
public void BeginEdit()
{
((IEditableObject)this.People).BeginEdit();
((IEditableObject)this.People.Student).BeginEdit(); //this code not working
//....
}
When runing the app, all data bound to People is fine.
All data bound to Student is not working.
How to fix it?
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我猜想 Student 属性在客户端为空。您需要将 [Include] 属性添加到服务器端的 Student 属性，以便 RIA 服务将其传递到客户端。您可能还需要为服务器端添加一个包含项以从数据库中检索它，具体取决于数据访问的编写方式。
I'd guess that the Student property is null on the client side. You need to add the [Include] attribute to the Student property on the server-side, so that it gets taken across to the client side by RIA services. You may also need to add an include for your server-side to retrieve it from the database, depending on how your data-access is written.