c# - 带参数的 RoutedCommand

Question

我正在玩RoutedCommand，我在寻找如何传递参数以便我的Executed方法将它包含在 e.Parameter 时遇到问题？

我的路由命令：

public static readonly RoutedCommand Foo = new RoutedCommand();

用法：

menuItem.Command = Commands.Foo;

执行：

private void Foo_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            object parameter = e.Parameter; // this is always null
        }

Answer 1

You're parameter is always null because you never set it anywhere

You can set it using the CommandParameter property

menuItem.Command = Commands.Foo;
menuItem.CommandParameter = "Bar";

Answer 2

You should use MenuItem.CommandParameter.

For example, you could set binding to some property, from which parameter is delivered.