[英]Is it possible to bind a WPF control to multiple data contexts?
I've written an UserControl whose DataContext contains a collection and an bool property. 我编写了一个UserControl,其DataContext包含一个集合和一个bool属性。 The collection is being displayed (and editited) within a data grid, which has custrom column templates.
该集合在一个具有custrom列模板的数据网格内显示(和编辑)。 The DataContext of a control in a column is of course an item of the collection of the UserControl's DataContext.
列中控件的DataContext当然是UserControl的DataContext集合的一项。 However I need to bind one property of the control in a column to the bool property of the UserControl's DataContext and not to the collection item.
但是,我需要将列中控件的一个属性绑定到UserControl的DataContext的bool属性,而不是集合项。
Do you have any ideas on how to solve this? 您对如何解决这个问题有任何想法吗?
Best Regards, Oliver 最好的问候,奥利弗
I'm pulling this straight from my answer on another post 我正在从另一篇文章的答案中直接得出这个结论
Getting at the "parent" of a databound object? 到达数据绑定对象的“父级”?
Here's the code from the post that I think might pertain to what youre trying to do: 这是我认为可能与您要执行的操作相关的文章代码:
<ListBox Name="list" ItemsSource="{Binding Items}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding}"/>
<ComboBox ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBox}}, Path=DataContext.Values}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Basically the DataContext of the ListBox in this case contains a few lists and a combobox within the DataTemplate of the ItemTemplate is bound to a different member of the DataContext of the ListBox while the ItemsSource is bound to the Items member of DataContext. 基本上,在这种情况下,ListBox的DataContext包含一些列表,并且ItemTemplate的DataTemplate中的组合框绑定到ListBox的DataContext的其他成员,而ItemsSource绑定到DataContext的Items成员。 I would think this could apply to your DataGrid and column templates.
我认为这可能适用于您的DataGrid和列模板。
Solution 1. Create a custom class which contains the collection and a bool property and set the DataContext to an instance of that class. 解决方案1.创建一个包含集合和bool属性的自定义类,并将DataContext设置为该类的实例。
Solution 2. Set the user control's DataContext to the collection and add a bool property to your user control. 解决方案2.将用户控件的DataContext设置为集合,并将bool属性添加到用户控件。
XAML: XAML:
<UserControl x:Class="DataContextDemo.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Name="self">
<StackPanel>
<ListBox ItemsSource="{Binding}" />
<CheckBox IsChecked="{Binding Path=MyBoolProp, ElementName=self}" />
</StackPanel>
</UserControl>
Code behind: 后面的代码:
using System.Windows;
using System.Windows.Controls;
namespace DataContextDemo
{
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}
public bool MyBoolProp
{
get { return (bool)GetValue(MyBoolPropProperty); }
set { SetValue(MyBoolPropProperty, value); }
}
public static readonly DependencyProperty MyBoolPropProperty =
DependencyProperty.Register("MyBoolProp",
typeof(bool),
typeof(UserControl1),
new UIPropertyMetadata(true));
}
}
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