我如何绑定到的RelativeSource自我？ [英] How do I bind to RelativeSource Self?

问题描述

我想结合我的XAML中几个不同的属性：

I am trying to bind several different properties in my Xaml:

<Label Content="{Binding Description}" 
Visibility="{Binding Path=DescriptionVisibility, 
ElementName=_UserInputOutput}"               
FontSize="{Binding Path=FontSizeValue, ElementName=_UserInputOutput}"  
HorizontalAlignment="Left" VerticalAlignment="Top" Padding="0" />

您会注意到我在这里用了两个不同的结合技术。使用元素名称的工作的人，其他没有。这里是code背后：

You will noticed I have used two Different binding techniques here. The ones using Element Name work, the other does not. Here is code behind:

public string Description
{
     get { return (string)GetValue(DescriptionProperty); }
     set { SetValue(DescriptionProperty, value); }
}
public static readonly DependencyProperty DescriptionProperty = 
DependencyProperty.Register("Description", typeof(string), typeof(UserControl), 
new UIPropertyMetadata(""));

每个绑定都有不同的名字，但他们都像这样大部分。
我希望我的绑定到能够一起工作：

Each Binding has a different name but they all look like this for the most part. I want my Binding to be able to work with:

{Binding Description}

而不是：

{Binding Path=Description, ElementName=_UserInputOutput}

这似乎只是用来当的ElementName是工作。我需要导出/导入此XAML，所以我不能有一个的ElementName或导入将无法正常工作。

It only seems to be working when ElementName is used. I need to export/import this XAML, so I can't have a ElementName or the import won't work.

我想这将是最好的：

{Binding Path=Description, RelativeSource={RelativeSource Self}}

这并不工作。

任何想法？谢谢！

推荐答案

您还没有设置DataContext的，这是什么的RelativeSource使用，以确定它的相对。您需要设置在DataContext在较高的水平，如用户控件。我通常有：

You haven't set the DataContext, which is what the RelativeSource is using to determine what it's relative to. You need to set the DataContext at a higher level, like the UserControl. I typically have:

<UserControl ... DataContext="{Binding RelativeSource={RelativeSource Self}}">
</UserControl>

这告诉用户控件本身的类绑定在codebehind。

This tells the UserControl to bind itself the class in the codebehind.

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