C#鼠标左键点击事件如何 绑定命令

要将C#中的鼠标左键点击事件(MouseLeftButtonDown)绑定到命令，可以使用以下步骤：

1. 在XAML中添加事件触发器：

<Button Content="Click Me" MouseLeftButtonDown="Button_MouseLeftButtonDown"/>

2. 在C#中创建命令和命令绑定器：

public class MyCommand : ICommand
{
    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        // 命令要执行的代码
    }
}

public class MyCommandBinding : DependencyObject
{
    public static readonly DependencyProperty CommandProperty = DependencyProperty.RegisterAttached(
        "Command", typeof(ICommand), typeof(MyCommandBinding), new PropertyMetadata(null, CommandPropertyChanged));

    public static ICommand GetCommand(DependencyObject obj)
    {
        return (ICommand)obj.GetValue(CommandProperty);
    }

    public static void SetCommand(DependencyObject obj, ICommand value)
    {
        obj.SetValue(CommandProperty, value);
    }

    private static void CommandPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        var element = obj as UIElement;
        if (element != null)
        {
            element.MouseLeftButtonDown += (sender, args) =>
            {
                var command = e.NewValue as ICommand;
                if (command != null && command.CanExecute(null))
                {
                    command.Execute(null);
                }
            };
        }
    }
}

3. 在XAML中绑定命令：

<Button Content="Click Me" local:MyCommandBinding.Command="{Binding MyCommand}"/>

这将使用自定义的命令绑定器将命令绑定到鼠标左键点击事件(MouseLeftButtonDown)。当按钮被点击时，命令将被执行。