我将接受的答案改编为。net Core，使用推荐的替换已弃用类:

腰椎->腰椎 ->工具箱

Program.cs

namespace TrayOnlyWinFormsDemo
{
    internal static class Program
    {
        [STAThread]
        static void Main()
        {
            ApplicationConfiguration.Initialize();
            Application.Run(new MyCustomApplicationContext());
        }
    }
}

MyCustomApplicationContext.cs

using TrayOnlyWinFormsDemo.Properties;  // Needed for Resources.AppIcon

namespace TrayOnlyWinFormsDemo
{
    public class MyCustomApplicationContext : ApplicationContext
    {
        private NotifyIcon trayIcon;

        public MyCustomApplicationContext()
        {
            trayIcon = new NotifyIcon()
            {
                Icon = Resources.AppIcon,
                ContextMenuStrip = new ContextMenuStrip()
                {
                    Items = { new ToolStripMenuItem("Exit", null, Exit) }
                },
                Visible = true
            };
        }

        void Exit(object? sender, EventArgs e)
        {
            trayIcon.Visible = false;
            Application.Exit();
        }
    }
}

在。net 6中，我必须像这样工作我的类的核心:

private NotifyIcon trayIcon;
private ContextMenuStrip contextMenu1;
private ToolStripMenuItem menuItem1;

public MyCustomApplicationContext()
{
    contextMenu1 = new System.Windows.Forms.ContextMenuStrip();
    menuItem1 = new System.Windows.Forms.ToolStripMenuItem();
    this.menuItem1.Text = "E&xit";
    this.menuItem1.Click += new System.EventHandler(Exit);
    this.contextMenu1.Items.AddRange(
            new System.Windows.Forms.ToolStripMenuItem[] {this.menuItem1 });
    trayIcon = new NotifyIcon(){Icon = Resources.AppIcon, ContextMenuStrip = this.contextMenu1, Visible = true };            

}

据我所知，您仍然必须使用表单编写应用程序，但在表单上没有控件，并且永远不会将其设置为可见。使用NotifyIcon(可以在这里找到它的MSDN示例)来编写应用程序。

您可以创建表单，修改它，然后将它传递给应用程序。作为参数运行。：

    internal static class Program
    {
        /// <summary>
        ///  The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            ApplicationConfiguration.Initialize();
            var form = new Form1();
            form.Hide();
            form.Opacity = 0;
            form.ShowInTaskbar = false;
            Application.Run(form);
        }
    }

添加你的通知图标和上下文菜单(如果需要)到你的表单在设计时作为一个常规的应用程序。确保你的通知图标是可见的，并有一个相关的图标。这还将允许您使用以后可能出于任何原因需要的表单

我将接受的答案改编为。net Core，使用推荐的替换已弃用类:

腰椎->腰椎 ->工具箱

Program.cs

namespace TrayOnlyWinFormsDemo
{
    internal static class Program
    {
        [STAThread]
        static void Main()
        {
            ApplicationConfiguration.Initialize();
            Application.Run(new MyCustomApplicationContext());
        }
    }
}

MyCustomApplicationContext.cs

using TrayOnlyWinFormsDemo.Properties;  // Needed for Resources.AppIcon

namespace TrayOnlyWinFormsDemo
{
    public class MyCustomApplicationContext : ApplicationContext
    {
        private NotifyIcon trayIcon;

        public MyCustomApplicationContext()
        {
            trayIcon = new NotifyIcon()
            {
                Icon = Resources.AppIcon,
                ContextMenuStrip = new ContextMenuStrip()
                {
                    Items = { new ToolStripMenuItem("Exit", null, Exit) }
                },
                Visible = true
            };
        }

        void Exit(object? sender, EventArgs e)
        {
            trayIcon.Visible = false;
            Application.Exit();
        }
    }
}

“系统托盘”应用程序只是一个普通的win表单应用程序，唯一的区别是它在windows系统托盘区域创建了一个图标。为了创建sys。托盘图标使用NotifyIcon组件，你可以在工具箱(常用控件)中找到它，并修改它的属性:图标，工具提示。它还允许您处理鼠标单击和双击消息。

还有一件事，为了实现外观和感觉或标准托盘应用程序。添加followinf行在你的主窗体显示事件:

private void MainForm_Shown(object sender, EventArgs e)
{
    WindowState = FormWindowState.Minimized;
    Hide();
}