WPF：内容和DataContext的特性之间的区别是什么？ [英] WPF: What is the difference between the Content and DataContext properties?

问题描述

据我了解...

• 的DataContext 属性
  • 在控件使用此属性作为数据源
  • 是每个框架元件具有可用于流数据转换成屏幕的属性
  • 在DataContext的有范围
  的范围是根据其中的DataContext分配给对象树中建立了
  • 如果你父元素上设置DataContext的（例如，一个窗口），该属性会向下流到所有子元素（如文本框）
  • DataContext property
    • "controls use this property as a data source"
    • "is a property that each framework element has that can be used to flow data into the screen"
    • "DataContext has scope"
    • "the scope is established according to where the DataContext is assigned to in the object tree"
    • "if you set the DataContext on a parent element (e.g. a Window), that property will flow down to all child elements (e.g. a text box)"
    • 在该酒店发生在具体取决于所使用的控制许多名字：
      • ContentControl.Content
      • ItemsControl.ItemsSource
      • Items.ItemsSource
      • HeaderedContentControl.Header
      • HeaderedContentControl.Content
      • This property takes on many names depending on the control that is being used:
        • ContentControl.Content
        • ItemsControl.ItemsSource
        • Items.ItemsSource
        • HeaderedContentControl.Header
        • HeaderedContentControl.Content

        所以我的问题是：什么是内容之间的差异和的DataContext 属性？这里有一个细微之处，我很想念。难道......

        So my question is: what is the difference between the Content and DataContext properties? There is a nuance here that I am missing. Is it...

        1. 当的DataContext 流动数据到用户界面，
        2. 这是内容属性来确定的工作（通常是扔了一个绑定）究竟会显示（通过内容presenter +的ContentTemplate）
        1. While the DataContext flows data into the UI,
        2. It is the job of the Content property to determine (usually threw a binding) what will be displayed (via ContentPresenter + ContentTemplate)

        样品code

        <Window x:Name="myWindow" DataContext="{Binding ClassA}> 
            <StackPanel> <!-- DataContext is set to ClassA -->
        
                <!-- DataContext is set to ClassA, ClassA.Name will be displayed -->
                <Label Content="{Binding Name}" />
            </StackPanel>
         </Window>
        

        参考

        • MSDN：<一href="http://msdn.microsoft.com/en-us/library/system.windows.controls.contentcontrol.content%28v=vs.110%29.aspx"相对=nofollow> ContentControl.Content物业
        • MSDN：<一href="http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.datacontext%28v=vs.110%29.aspx"相对=nofollow> FrameworkElement.DataContext物业
        • 在MSDN： WPF内容模型
          • 值得一读
          • MSDN: ContentControl.Content Property
          • MSDN: FrameworkElement.DataContext Property
          • MSDN: WPF Content Model
            • worth reading

            推荐答案

            的DataContext 是在WPF更一般的特征，所建议的所有权由低层次的FrameworkElement的类。

            DataContext is a more general feature in WPF, as suggested by its ownership by the low-level FrameworkElement class.

            • 在它参与绑定的所有的框架元素，作为默认绑定源。
            • 正如你所说，一个元素的DataContext的被传递到子元素。
            • it participates in bindings for all framework elements, as the default binding source.
            • as you mentioned, an element's DataContext is passed down to child elements.

            内容是更具体的：

            • 这是针对一组控制（主要是那些从 ContentControl中继承的控制非常有限的依赖属性 - 其他控件，如的ListBox 没有自己的内容属性本身，而是使用的在他们的控制模板某处ContentControl中）。
            • 在它没有传下来像DataContext的，相反却是只关心用所拥有的控制和它的直接的关系（即绑定）
            • 在使用它调用的东西，控制要显示，在控制自身不知道或不关心什么类型的对象，这将是。
            • 在它经常被用来在cojunction与的ContentTemplate - 也就是说，内容是的什么的显示，并且的ContentTemplate是的如何，以显示它。 （按钮就是一个很好的例子。）
            • it is a dependency property specific to a very limited set of controls (mostly those controls that inherit from ContentControl -- other controls such as ListBox do not own a Content property themselves, but use a ContentControl somewhere in their control templates).
            • it is not passed down like the DataContext, but is rather concerned solely with the owning Control and its immediate relationships (ie, bindings)
            • it is used by controls that call for something to be displayed, where the control itself does not know or care what type of object that will be.
            • it is often used in cojunction with ContentTemplate -- that is, Content is what to display, and ContentTemplate is how to display it. (Button is a good example of this.)

            这篇关于WPF：内容和DataContext的特性之间的区别是什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！