WPF UserControls - 在UserControl内的按钮上设置.Command属性

Question

我有一个UserControl包含一个按钮和一些其他控件:

<UserControl>
  <StackPanel>
     <Button x:Name="button" />
     ...
  </StackPanel>
</UserControl>

当我创建该控件的新实例时,我想要获取Button的Command属性:

<my:GreatUserControl TheButton.Command="{Binding SomeCommandHere}">
</my:GreatUserControl>

当然,"TheButton.Command"的东西不起作用.

所以我的问题是:使用XAML,如何在用户控件中设置按钮的.Command属性？

Answer 1

将依赖项属性添加到UserControl并将按钮的Command属性绑定到该属性.

所以在你的GreatUserControl中:

public ICommand SomeCommand
{
    get { return (ICommand)GetValue(SomeCommandProperty); }
    set { SetValue(SomeCommandProperty, value); }
}

public static readonly DependencyProperty SomeCommandProperty =
    DependencyProperty.Register("SomeCommand", typeof(ICommand), typeof(GreatUserControl), new UIPropertyMetadata(null));

在你的GreatUserControl的XAML中:

<UserControl 
    x:Class="Whatever.GreatUserControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Name="me"
    >
    <Button Command="{Binding SomeCommand,ElementName=me}">Click Me!</Button>
</UserControl>

所以你的按钮绑定到UserControl本身的命令.现在您可以在父窗口中设置它:

<my:GreatUserControl SomeCommand="{Binding SomeCommandHere}" />