绑定到当前ItemsSource上下文之前的DataContext [英] Binding to DataContext outside current ItemsSource context

问题描述

我有一个 DataSet 绑定到 Window.DataContext ;我还有一个 DataGrid ：

I have a DataSet bound to the Window.DataContext; I also have a DataGrid:

<DataGrid ItemsSource={Binding Tables[Items]}>
    <DataGrid.Columns>
        <DataGridTextBoxColumn Header={Binding Path=DataContext.Tables[Names]/Test, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}} />
    </DataGrid.Columns>
</DataGrid>

基本上，我试图将该列的标题绑定到DataTableNames，Column测试，第一行。

Basically, I'm trying to bind the Header of that column to DataTable "Names", Column "Test", first row.

但是，我无法得到正确的。请注意，我可以在DataGrid之外绑定它。 Grid的ItemsSource会更改数据上下文，我不知道如何引用原来的DataContext。

However, I can't get it right. Note that I can bind it fine outside the DataGrid. The Grid's ItemsSource changes the data context and I don't know how to refer outside to the original DataContext.

似乎绑定成功;但是问题是Window.DataContext中的Tables [Names]的当前项目（第一行）丢失了。

It seems that the binding succeeds; but the problem is that the current item (first row) of the Tables[Names] in the Window.DataContext got lost.

如果我让DataSet静态访问它通过{x：Static local：dataset}然后事情工作正常。但是我不能使用静态数据集，因为会有多个实例（多用户）。

If I make the DataSet static and access it via {x:Static local:dataset} then things work fine. But I can't use static datasets because there will be multiple instances (multi-user).

任何人都可以指向正确的方向？

Can anyone please point me in the right direction?

推荐答案

我很确定你可以使用 RelativeSource 绑定

I'm pretty sure you could do what you're trying to do by using RelativeSource binding.

<DataGrid ItemsSource="{Binding StringCollection}" 
          AutoGenerateColumns="False">
  <DataGrid.Columns>
    <DataGridTextColumn Binding="{Binding}" />
    <DataGridTextColumn Binding="{
                          Binding RelativeSource={
                            RelativeSource FindAncestor, 
                            AncestorType={x:Type Window}},
                          Path=DataContext.SomethingOutsideDataContext}" />
  </DataGrid.Columns>
</DataGrid>

我做了一个简单的例子： http://bitbucket.org/claus/wpf-bindingoutsidedatacontext

I made a quick example at: http://bitbucket.org/claus/wpf-bindingoutsidedatacontext

它允许你绑定到父窗口，在我的例子中有viewmodel作为datacontext（在它上面有SomethingOutsideDataContext属性）。

It allows you to bind to the parent Window, which in my case has the viewmodel as datacontext (with the SomethingOutsideDataContext property on it).

你应该知道，这只能用于WPF，而不是Silverlight - FindAncestor，AncestorType的东西还没有在Silverlight中实现...我不知道还有另外一种方法，除了使用静态资源。

You should be aware though, this will only work with WPF and not Silverlight - the 'FindAncestor, AncestorType' stuff has not been implemented in Silverlight yet... I'm not sure if there's another method, besides using static resources.

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