我正在尝试使用一些嵌套属性来开发用户控件,这些属性允许使用数据绑定来设置它。例如,我有这样的事情:
// Top level control
public class MyControl : Control
{
public string TopLevelTestProperty
{
get { return (string)GetValue(TopLevelTestPropertyProperty); }
set { SetValue(TopLevelTestPropertyProperty, value); }
}
public static readonly DependencyProperty TopLevelTestPropertyProperty =
DependencyProperty.Register("TopLevelTestProperty", typeof(string), typeof
(MyControl), new UIPropertyMetadata(""));
// This property contains nested object
public MyNestedType NestedObject
{
get { return (MyNestedType)GetValue(NestedObjectProperty); }
set { SetValue(NestedObjectProperty, value); }
}
public static readonly DependencyProperty NestedObjectProperty =
DependencyProperty.Register("NestedObject", typeof(MyNestedType), typeof
(MyControl), new UIPropertyMetadata(null));
}
// Nested object's type
public class MyNestedType : DependencyObject
{
public string NestedTestProperty
{
get { return (string)GetValue(NestedTestPropertyProperty); }
set { SetValue(NestedTestPropertyProperty, value); }
}
public static readonly DependencyProperty NestedTestPropertyProperty =
DependencyProperty.Register("NestedTestProperty", typeof(string), typeof
(MyNestedType), new UIPropertyMetadata(""));
}
// Sample data context
public class TestDataContext
{
public string Value
{
get
{
return "TEST VALUE!!!";
}
}
}
...
this.DataContext = new TestDataContext();
...
XAML:
<local:mycontrol x:name="myControl" topleveltestproperty="{Binding Value}" >
<local:mycontrol.nestedobject>
<local:mynestedtype x:name="myNestedControl" nestedtestproperty="{Binding Value}" />
</local:mycontrol.nestedobject>
</local:mycontrol>
它适用于属性 TopLevelTestProperty,但不适用于 NestedTestProperty。
看来嵌套绑定不起作用。有人可以帮我吗?有什么办法可以进行这样的绑定吗?
我认为发生这种情况是因为我的嵌套对象没有任何对顶级对象的引用,因此无法使用 MyControl 的 DataContext 来解析它。
H.B.对,嵌套控件不继承 DataContextmycontrol
。
尝试明确设置它:
<local:mycontrol x:name="myControl"
topleveltestproperty="{Binding Value}" >
<local:mycontrol.nestedobject>
<local:mynestedtype x:name="myNestedControl"
DataContext="{Binding ElementName=myControl,
Path=DataContext}"
nestedtestproperty="{Binding Value}" />
</local:mycontrol.nestedobject>
</local:mycontrol>
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