在WPF中为UserControl设置数据上下文时出错

Question

I have usercontrol where I am trying to set the DataContext as below:

<UserControl.DataContext>
    <Binding ElementName="dataGrid" Path="MyViewModel">

    </Binding>
</UserControl.DataContext>

Here dataGrid is a child DataGrid control and MyViewModel is my ViewModel class. Currently its giving following error while runtime:

Cannot find source for binding with reference 'ElementName=dataGrid'. BindingExpression:Path=MyViewModel; DataItem=null; target element is 'UserControl1' (Name=''); target property is 'DataContext' (type 'Object')

Can anyone please help what is the problem here?

Answer 1

The issue is most likely due to Name Scoping constraints. ElementName Bindings only work properly within defined boundaries. This specific error is saying that it can't find the named element "dataGrid". Can you show more of the surrounding XAML?

Answer 2

Is MyViewModel set on the DataContext of dataGrid?

If so change MyViewModel in Path to DataContext and you are good to go... If not, set your MyViewModel class to DataContext and remove the ElementName from the Binding, and it should work as well ;)

Answer 3

此绑定尝试访问dataGrid.MyViewModel ，但是MyViewModel不是DataGrid的属性...您应该执行类似的操作：

<Binding ElementName="dataGrid" Path="DataContext.MyViewModel">