将 ItemsControl 中项目的属性绑定到 ItemsSource 之外的值? [英] Binding property of item from ItemsControl to value outside of ItemsSource?

问题描述

我有一个 ItemsControl 和一个人员列表.人员列表中的每个元素都包含此人的姓名，而没有其他内容.在 c# 代码中，我将 testItemsControl.ItemsSource 设置为包含每个人姓名的可观察集合.公司是在代码隐藏中定义的.以下 xaml 代码正确地找到了名称，但当然没有找到公司.

I have an ItemsControl and I have a list of people. Each element in the list of people contains the person's name and nothing else. In the c# code, I set testItemsControl.ItemsSource to an observable collection that contain the name of each person. Company is defined in the code-behind. The following xaml code correctly finds the Name, but of course doesn't find the Company.

    <ItemsControl x:Name="testItemsControl">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Grid>
                    <TextBlock Text="{Binding Name}"/>
                    <TextBlock Text="{Binding Company}"/>
                </Grid>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>

如何正确绑定公司?

推荐答案

你必须使用 RelativeSource 绑定.

You have to use RelativeSource binding.

背后的代码.

public partial class Window3 : Window
{
    public Window3()
    {
        InitializeComponent();
        this.DataContext = this;
        BuildData();
        Company = "XYZ";
        testItemsControl.ItemsSource = Persons;
    }

    private void BuildData()
    {
        Persons.Add(new Person() { Name = "R1" });
        Persons.Add(new Person() { Name = "R2" });
        Persons.Add(new Person() { Name = "R3" });
    }

    public string Company { get; set; }

    private ObservableCollection<Person> _persons = new ObservableCollection<Person>();

    public ObservableCollection<Person> Persons
    {
        get { return _persons; }
        set { _persons = value; }
    }
}

XAML 代码

<ItemsControl x:Name="testItemsControl">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Name}" Margin="5"/>
                    <TextBlock Text="{Binding Company, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" Margin="5" />

                </StackPanel>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>

谢谢，拉吉尼坎特

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