c# – 从“系统托盘”图标打开一个窗口

所以我创建了一个带有系统托盘图标的窗口.窗口开始最小化,并在单击系统托盘图标时重新显示.但是,它仅在您单击最小化按钮时有效.如果单击红色退出按钮,窗口将消失,系统托盘图标将保留(应该如此),但是当您单击它时,程序将抛出错误.

Cannot set Visibility or call Show, ShowDialog, or
WindowInteropHelper.EnsureHandle after a Window has closed.

这是相关的代码

public partial class MainWindow : Window
{
    public static NotifyIcon icon;

    List<string> food = new List<string>();
    bool on = false;

    public MainWindow()
    {
        InitializeComponent();

        food.Add("Breakfast");
        food.Add("Soups");
        food.Add("Vegetables");
        food.Add("Crab roll");
        food.Add("Sushi");
        food.Add("Egg rolls");
        food.Add("Salad");


        MainWindow.icon = new NotifyIcon();

        window1.WindowState = WindowState.Minimized; 

        icon.Icon = new System.Drawing.Icon("favicon.ico");
        icon.Visible = true;

        icon.Click += new EventHandler(icon_Click);
        icon.BalloonTipClicked += new EventHandler(icon_BalloonTipClicked);
        icon.DoubleClick += new EventHandler(icon_DoubleClick);
        icon.BalloonTipClosed += new EventHandler(icon_BalloonTipClosed);
        icon.MouseMove += new System.Windows.Forms.MouseEventHandler(icon_MouseMove);
        StateChanged += new EventHandler(MainWindow_StateChanged);

    }

    void icon_BalloonTipClicked(object sender, EventArgs e)
    {
        this.Show(); //This is where the error is 
        window1.WindowState = WindowState.Normal;
    }

    void icon_DoubleClick(object sender, EventArgs e)
    {
        this.Show(); //This is where the error is 
        window1.WindowState = WindowState.Normal;
    }

    void icon_BalloonTipClosed(object sender, EventArgs e)
    {
        on = false;
    }

    void icon_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
    {

        if (!on)
        {
            icon.BalloonTipText = "";
            foreach(string item in food){
                if (!item.Contains("Breakfast") && !item.Contains("Soups") && !item.Contains("Vegetables"))
                {
                    icon.BalloonTipText += item+"\n";
                }
            }
            icon.ShowBalloonTip(10);
            on = true;
        }

    }

    void MainWindow_StateChanged(object sender, EventArgs e)
    {
        if (window1.WindowState == WindowState.Minimized)
        {
            this.Hide();
        }
    }

    private void icon_Click(Object sender, EventArgs e)
    {
        icon.BalloonTipText = "";
        foreach (string item in food)
        {
            if (!item.Contains("Breakfast") && !item.Contains("Soups") && !item.Contains("Vegetables"))
            {
                icon.BalloonTipText += item + "\n";
            }
        }
        icon.ShowBalloonTip(10);
        on = true;

    }        
}

解决方法:

截取窗口的Closing事件,并取消它(这将阻止窗口关闭) – 然后隐藏窗口：

    public MainWindow()
    {
        // Subscribe to closing event (when X is pressed)
        this.Closing += MainWindow_Closing;
        InitializeComponent();
    }

    void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
    {
        // Prevent window from closing
        e.Cancel = true;

        // Hide window
        this.Hide();
    }

标签：c,icons,wpf,windowstate
来源： https://codeday.me/bug/20190520/1143297.html