如何改变一个按钮，父母家长的DataContext的DataContext的？ [英] How to change the DataContext of a button to the parents parent DataContext?

问题描述

我有2班在WPF：

• 会议


• 个人

在会议上，我已经2 ObservableCollections ; AttendingMeeting 和 NotAttendingMeeting 包含人对象

In meeting I have 2 ObservableCollections; AttendingMeeting and NotAttendingMeeting that contain People objects

在XAML的的DataContext 设置为会议，我有2 的DataGrid S（ AttendingMeeting 和 NotAttendingMeeting ）

In the xaml the DataContext are set to Meeting, and I have 2 DataGrids (AttendingMeeting and NotAttendingMeeting)

我需要一个按钮添加到每个的DataGrid 取值添加和<$ C $删除C>会议，但后来我需要将的DataContext 在按钮，例如从改变： AttendingMeeting 到会议，使会议类可以处理添加和删除人从的ObservableCollection 秒。

I need to add a Button to each of the DataGrids to add and remove from Meeting, But then I need to change the DataContext on the Button from e.g.: AttendingMeeting to Meeting, so that the Meeting class can handle the adding and removing People from the ObservableCollections.

我怎样才能做到这一点在XAML（修改的DataContext 从 AttendingMeeting 项目向父母父 - ＆GT;会议）

How can I do this in xaml (changing the DataContext from AttendingMeeting items to the parents parent-> Meeting)?

推荐答案

假设你试图绑定到一个命令在会议类从的DataGrid 中：

Assuming you're trying to bind to a Command on the Meeting class from within the DataGrid:

您可以在您的结合才能到的DataContext 你有兴趣使用的RelativeSource 。你'重新标记将类似于这样：

You can use a RelativeSource on your binding to get to the DataContext you're interested in. You're markup would look something similar to this:

<Grid DataContext="..."> <!-- Assuming a grid is you're layout root and that it's datacontext is the Meeting you spoke of -->
   ...
   <DataGrid ...>
      ...

      <Button Content="Click Me!"
              Command="{Binding Path="DataContext.RemovePersonCommand"
                                RelativeSource={RelativeSource FindAncestor,
                                                AncestorType={x:Type Grid}}}"
              CommandParameter="{Binding}"/> <!-- This would be binding to the current person -->
      ...
   </DataGrid>
   ...
</Grid>

您也可以使用的ElementName 绑定到具有的DataContext 你感兴趣，如果你的父母再处理大量嵌套和的RelativeSource 太复杂了。

You could also use ElementName to bind to a parent that has the DataContext you're interested in if you're dealing with lots of nesting and a RelativeSource would be too complicated.

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