将DataContext设置为XAML中的当前代码隐藏对象

Question

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(并DataContext = this;从代码隐藏中删除)它适用于子节点:

<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.

Answer 1

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

应该管用.

但是如果在InitializeComponent()调用之前未设置属性,则WPF绑定机制不知道您的属性的值已更改.

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.