单实例Windows窗体应用程序与最小化托盘

本文关键字:应用程序 最小化 窗体 Windows 实例 单实例 | 更新日期: 2023-09-27 18:16:58

我有一个示例WinForm应用程序名为" restore .exe"。在最小化其窗口时,它将移动到系统托盘并隐藏在任务栏中。如果我点击系统托盘中的通知图标,窗口将出现在前面。

public void notifyicon_MouseClick(object sender, System.EventArgs e)
{
    notifyicon.Visible = false;
    Show();
    Activate();
    TopMost = true;
    BringToFront();
    this.WindowState = FormWindowState.Normal;
}

但是我的实际要求是,当第二次点击应用程序时,需要从系统托盘中恢复应用程序。

对于这个,我尝试了下面的代码

Program.cs:

static void Main()
{
    if (IsServiceManagerAlreadyRunning())
    {
        Form1 form1 = new Form1();
        form1.Restore();
    }
    else
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
    }
}

Form1.cs:

public void Restore()
{
    notifyicon.Visible = false;
    Show();
    Activate();
    TopMost = true;
    BringToFront();
    this.WindowState = FormWindowState.Normal;
} 

我的实际问题是,如果应用程序已经在运行,"恢复"方法正在运行,其中列出的所有操作都在运行,窗口出现在前面。但是在完成这些操作之后,窗口再次进入系统托盘。而不是坐在前面。

谁能提供一个解决方案吗?

单实例Windows窗体应用程序与最小化托盘

创建单个实例

Microsoft.VisualBasic.dll的引用添加到您的项目中,并将该类添加到您的项目中:

using System;
using Microsoft.VisualBasic.ApplicationServices;
using System.Windows.Forms;
namespace Sample
{
    public class ApplicationController : WindowsFormsApplicationBase
    {
        private Form mainForm;
        public ApplicationController(Form form)
        {
            //We keep a reference to main form 
            //To run and also use it when we need to bring to front
            mainForm = form;
            this.IsSingleInstance = true;
            this.StartupNextInstance += this_StartupNextInstance;
        }
        void this_StartupNextInstance(object sender, StartupNextInstanceEventArgs e)
        {
            //Here we bring application to front
            e.BringToForeground = true;
            mainForm.ShowInTaskbar = true;
            mainForm.WindowState = FormWindowState.Minimized;
            mainForm.Show();
            mainForm.WindowState = FormWindowState.Normal;
        }
        protected override void OnCreateMainForm()
        {
            this.MainForm = mainForm;
        }
    }
}

然后在Program.cs中使用ApplicationController来运行程序:

using System;
using System.Windows.Forms;
namespace Sample
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            //create a controller and Pass an instance of your application main form
            var controller =  new Sample.ApplicationController(new YourMainForm());
            //Run application
            controller.Run(Environment.GetCommandLineArgs());
        }
    }
}

现在你的应用程序是单实例,当你点击你的exe文件,而不是运行另一个实例,将现有的实例带到前面。

使用NotifyIcon

在你的主窗体上放一个NotifyIcon,然后当你点击最小化按钮时隐藏窗口,当你点击通知图标时显示窗口,你可以处理这些事件:

//When click on notify icon, we bring the form to front
private void notifyIcon_Click(object sender, EventArgs e)
{
    this.ShowInTaskbar = true;
    this.WindowState = FormWindowState.Minimized;
    this.Show();
    this.WindowState = FormWindowState.Normal;
}
//here we check if the user minimized window, we hide the form
private void ApplicationMainForm_Resize(object sender, EventArgs e)
{
    if (this.WindowState == FormWindowState.Minimized)
    {
        this.ShowInTaskbar = false;
        this.Hide();
    }
}
//when the form is hidden, we show notify icon and when the form is visible we hide it
private void ApplicationMainForm_VisibleChanged(object sender, EventArgs e)
{
    this.notifyIcon1.Visible = !this.Visible;
}

问题在于main()中if块的两个分支都创建了一个新表单,因此您没有对已经运行的表单做任何事情。

如果有一个程序的实例已经在运行(IsServiceManagerAlreadyRunning() == true?),你需要从第一个实例中找到窗口并激活它,而不是创建一个新的Form。

您可以尝试通过窗口标题或更复杂的解决方案来查找窗口。在Google上搜索"windows应用程序单个实例",返回了许多文章。

我想这就是你需要的:-

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void notifyIcon1_Click(object sender, EventArgs e)
        {
            this.Show();
            this.WindowState = FormWindowState.Normal;
        }
        private void Form1_ResizeBegin(object sender, EventArgs e)
        {
            if (WindowState == FormWindowState.Minimized)
            {
                this.Hide();
            }
        }
    }