wpf 上下文菜单绑定到父窗口的数据上下文
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Context Menu Binding to Parent Window's Datacontext
提问by Helic
I have a TreeListControl that binds to a collection in my VM. I also want to define the context menu inside the treelistcontrol having its header text bind to another string in my VM. how can I set the data context in this case? I tried to
我有一个 TreeListControl 绑定到我的 VM 中的集合。我还想在 treelistcontrol 中定义上下文菜单，使其标题文本绑定到我的 VM 中的另一个字符串。在这种情况下如何设置数据上下文？我试过了
<Window.DataContext>
<model:ViewModel></model:ViewModel>
</Window.DataContext>
<Grid>
<Button Grid.Row="1" Command="{Binding CellCheckedCommand}"></Button>
<TextBlock Text="{Binding HeaderText}" Grid.Row="2">
<TextBlock.ContextMenu>
<ContextMenu>
<MenuItem DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=DataContext}" Header="{Binding HeaderText}"></MenuItem>
</ContextMenu>
</TextBlock.ContextMenu>
</TextBlock>
</Grid>
but it doesn't work.
但它不起作用。
Here is the ViewModel
这是视图模型
public DelegateCommand CellCheckedCommand { get; set; }
private String _HeaderText;
public String HeaderText
{
get
{
return _HeaderText;
}
set
{
_HeaderText = value;
NotifyPropertyChanged("HeaderText");
}
}
public void NotifyPropertyChanged(String name)
{
if(PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
private void CellCheckedMethod()
{
HeaderText = "Changed";
}
采纳答案by ΩmegaMan
Provide a name for your window and explicitly bind to it such as
为您的窗口提供一个名称并明确绑定到它，例如
<window x:Name="ReportsPage"/>
...
<MenuItem DataContext="{Binding ElementName=ReportsPage}"/>
UPDATE
更新
Since the context menu is actually in its own window, binding is a bit trickier. Hence the best bet is to walk up the RelativeSourceto the context's parent and pull the header text from there:
由于上下文菜单实际上在其自己的窗口中，因此绑定有点棘手。因此，最好的办法是走到RelativeSource上下文的父级并从那里拉出标题文本：
<Window.DataContext>
<local:MainVM HeaderText="Jabberwocky" />
</Window.DataContext>
...
<TextBlock Text="{Binding HeaderText}">
<TextBlock.ContextMenu>
<ContextMenu>
<MenuItem Header="{Binding Path=Parent.DataContext.HeaderText,
RelativeSource={RelativeSource Self}}" />
</ContextMenu>
</TextBlock.ContextMenu>
Which for this context produces this
对于这种情况，这会产生
回答by lisp
This binds to a Window:
这绑定到一个Window：
DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}}"
If the command AddItemCommandand property AddItemTextare defined on the WindowViewModel, bind to WindowDataContext:
如果命令AddItemCommand和属性AddItemText在 上定义，则WindowViewModel绑定到WindowDataContext：
DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=DataContext}"
