WPF ContextMenu Closed Event，如何区分关闭方法

Question

在我的 Canvas 内，我有一个 ContextMenu，当您在菜单中选择一个选项或单击它外部时，它具有关闭的预期功能。但是，我希望我的程序根据用于关闭 ContextMenu 的方法做出不同的响应。据我所知，ContextMenu 上的 Closed 事件在这两种情况下都会触发。有什么办法可以区分吗？

Answer 1

你能解释一下问题吗？ 我认为很明显，你必须设想。 1：单击您创建的 ContexMenu 选项，这将确保调用一个事件，然后单击它外部将取消上下文菜单。顺便说一句，我根据对您问题的理解做出了回答。如果我错了，请告诉我。

下面的代码只是一个演示代码，背后的逻辑很重要。

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    // Windows Load event
    private void MainWindow_OnLoaded(object sender, RoutedEventArgs e)
    {
        // Very Important Because by default it's null
        this.ContextMenu = new ContextMenu();

        // Making 3 sample Menu Item for ContextMenu
        MenuItem firstMenuItem = new MenuItem()
        {
            Header = "FirsMenu"
        };

        //1st of three way to give event to Controls. 
        // Giving click Event to firstMenuItem to seprate it's click behavior from Other Menu Items
        firstMenuItem.Click += (s, e) =>
        {
            // if Tag be Null on context Menu closing it's get that non of item selected so the click must be out side or lost focused
            this.ContextMenu.Tag = 1;
            MessageBox.Show("First Menu Clicked");
        };

        MenuItem secondMenuItem = new MenuItem()
        {
            Header = "SecondMenu"
        };

        //2nd of three way to give event to Controls. 
        // Giving click Event to secondMenuItem to seprate it's click behavior from Other Menu Items
        secondMenuItem.Click += delegate
        {
            // if Tag be Null on context Menu closing it's get that non of item selected so the click must be out side or lost focused
            this.ContextMenu.Tag = 1;
            MessageBox.Show("Second Menu Clicked");
        };

        MenuItem thirdMenuItem = new MenuItem()
        {
            Header = "ThirdMenu"
        };

        //3rd of three way to give event to Controls. 
        // Giving click Event to thirdMenuItem to seprate it's click behavior from Other Menu Items
        thirdMenuItem.Click += ThirdMenuOnClick;

        this.ContextMenu.Items.Add(firstMenuItem);
        this.ContextMenu.Items.Add(secondMenuItem);
        this.ContextMenu.Items.Add(thirdMenuItem);

        this.ContextMenu.Closed += ContextMenuOnClosed;
    }

    private void ThirdMenuOnClick(object sender, RoutedEventArgs e)
    {
        // if Tag be Null on context Menu closing it's get that non of item selected so the click must be out side or lost focused
        this.ContextMenu.Tag = 1;
        MessageBox.Show("Third Menu Clicked");
    }

    // Event for opening contextmenu on right mouse button click 
    private void MainWindow_OnMouseRightButtonDown(object sender, MouseButtonEventArgs e)
    {
        this.ContextMenu.IsOpen = true;
    }

    private void ContextMenuOnClosed(object sender, RoutedEventArgs e)
    {
        // if null means click must be out side or lost focused
        if (((ContextMenu)sender).Tag == null)
        {
            MessageBox.Show("You Clicked OutSide");
        }

        // very Importnt code , because it will reset the context menu tag logically
        ((ContextMenu)sender).Tag = null;
    }

}

祝你一切顺利，海达尔。