当XAML被处理/执行时，它正在实例化所有类。

< 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?

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"/>!!