XAML数据绑定类 [英] XAML Data Binding Class

问题描述

我对WPF中的数据绑定有疑问。从Microsoft的文档，这里： http://msdn.microsoft.com/en-us/library/ms752347。 aspx [ ^ ]那里是关于源类的东西。

 <   DockPanel   
   
       xmlns   =  http://schemas.microsoft.com/winfx/2006/xaml/presentation  
   
       xmlns：x   =  http://schemas.microsoft.com/winfx / 2006 / xaml  
   
       xmlns：c   =   clr-namespace：SDKSample >  
 <   DockPanel.Resources  >  
 <   c：MyData     x：Key   =  myDataSource  /  >  
 <   / DockPanel.Resources  >  
 <   DockPanel.DataContext  >  
 <  绑定    Source   =  {StaticResource myDataSource} < span class =code-keyword> /  >  
 <   / DockPanel.DataContext  >  
 <  按钮   背景  =  {Binding Path = ColorName}  
   
      < span class =code-attribute>                宽度  =  150   高度  =  30  > 我一定是RED！<   / Button  >  
 <   / DockPanel  >  

这里我们有一个MyData的源类。但仅作为一个类，它没有被实例化。所以我们不知道它的Binding Path = ColorName是否为红色。但它为按钮提供了红色。所以我的问题是如何在没有实例化的情况下发生这种情况？这是一个静态类还是我们有一个代码隐藏，微软没有显示实例化MyData？

解决方案

当XAML被处理/执行时，它正在实例化< b>所有类。

< DockPanel> ...< / DockPanel> 被实例化， 所以< Button> ...< /按钮>

以及< c：MyData x：Key =myDataSource/> !!

Hi, i have a question about data binding in WPF. From Microsoft's documentation,here: http://msdn.microsoft.com/en-us/library/ms752347.aspx[^] there is something that bugs me about the source class.

<DockPanel

  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

  xmlns:c="clr-namespace:SDKSample">
  <DockPanel.Resources>
    <c:MyData x:Key="myDataSource"/>
  </DockPanel.Resources>
  <DockPanel.DataContext>
    <Binding Source="{StaticResource myDataSource}"/>
  </DockPanel.DataContext>
  <Button Background="{Binding Path=ColorName}"

          Width="150" Height="30">I am bound to be RED!</Button>
</DockPanel>

Here we have a source class of MyData. But as a class alone it's not instantiated. So we don't know if it's Binding Path = ColorName is red. But it gives the color red to the button. So my question is how did that happen without instantiation? Was that a static class or we have a code behind that Microsoft didn't show that instantiates MyData?

解决方案

When the XAML is processed/executed, it is instantiating all of the classes.
The <DockPanel> ... </DockPanel> is instantiated, so is the <Button>...</Button>
and so is the <c:MyData x:Key="myDataSource"/>!!

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