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将DataContext设置为XAML中的当前代码隐藏对象

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我正在尝试将UserControl的DataContext设置为UserControl的代码隐藏类 . 从代码隐藏方面来看，这很容易做到：

public partial class OHMDataPage : UserControl
{
    public StringList Stuff { get; set; }

    public OHMDataPage ()
    {
        InitializeComponent();

        DataContext = this;
    }
}

<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    x:Class="LCDHardwareMonitor.Pages.OHMDataPage">

    <ScrollViewer>
        <ListBox ItemsSource="{Binding Stuff}" />
    </ScrollViewer>

</UserControl>

但是，我怎样才能完全从XAML端和UserControl级别执行此操作？如果我这样做，它适用于子节点（并从代码隐藏中删除 DataContext = this; ）：

<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    x:Class="LCDHardwareMonitor.Pages.OHMDataPage">

    <ScrollViewer
        DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=UserControl}}">
        <ListBox ItemsSource="{Binding Stuff}" />
    </ScrollViewer>

</UserControl>

我真的很想了解如何在UserControl本身上执行此操作 . 我希望这可行：

<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    x:Class="LCDHardwareMonitor.Pages.OHMDataPage"
    DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}">

    <ScrollViewer>
        <ListBox ItemsSource="{Binding Stuff}" />
    </ScrollViewer>

</UserControl>

但事实并非如此 .

c# wpf xaml

1 回答

  • 6
    DataContext="{Binding Mode=OneWay, RelativeSource={RelativeSource Self}}"

    应该管用 .

    但是如果在调用 InitializeComponent() 之前未设置属性，则WPF绑定机制不会更改't know that your property'的值 .

    为了给你一个快速的想法：

    // the binding should work
public StringList Stuff { get; set; }
public Constructor()
{
    Stuff = new StringList { "blah", "blah", "foo", "bar" };
    InitializeComponent();
}

// the binding won't work
public StringList Stuff { get; set; }
public Constructor()
{
    InitializeComponent();
    Stuff = new StringList { "blah", "blah", "foo", "bar" };
}

    如果您使用的是字符串列表，请考虑使用 ObservableCollection . 这将在添加或删除项目时通知WPF绑定机制 .

    回复于

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