Question

C# 如何实现在系统托盘显示程序运行的多种图标？

就像QQ一样，来消息时显示的是每个好友的头像，请问要怎么实现这样的功能呢？如何给一个程序添加多个图标并显示？谢谢！

Answer 1

声明多个NotifyIcon实例不就行了？

通知区域中的图标是一些进程的快捷方式，这些进程在计算机后台运行，如防病毒程序或音量控制。这些进程不会具有自己的用户界面。NotifyIcon 类提供了编写此功能的方法。 Icon 属性定义显示在通知区域中的图标。 图标的弹出菜单由 ContextMenu 属性确定。 Text 属性分配工具提示文本。 要在通知区域中显示图标，必须将 Visible 属性设置为 true。

示例下面的代码示例演示如何使用 NotifyIcon 类在通知区域中显示某一应用程序的图标。 该示例演示如何设置 Icon、 ContextMenu、 Text 和 Visible 属性以及如何处理 DoubleClick 事件。 一个带有 “退出”项的 ContextMenu 被分配给 NotifyIcon ..::.ContextMenu 属性，使用户可以关闭应用程序。 当发生 DoubleClick 事件时，将通过调用 Form ..::.Activate 方法来激活该应用程序窗体。

using System;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.NotifyIcon notifyIcon1;
private System.Windows.Forms.ContextMenu contextMenu1;
private System.Windows.Forms.MenuItem menuItem1;
private System.ComponentModel.IContainer components;

[STAThread]
static void Main()
{
Application.Run(new Form1());
}

public Form1()
{
this.components = new System.ComponentModel.Container();
this.contextMenu1 = new System.Windows.Forms.ContextMenu();
this.menuItem1 = new System.Windows.Forms.MenuItem();

// Initialize contextMenu1
this.contextMenu1.MenuItems.AddRange(
new System.Windows.Forms.MenuItem[] {this.menuItem1});

// Initialize menuItem1
this.menuItem1.Index = 0;
this.menuItem1.Text = "E&xit";
this.menuItem1.Click += new System.EventHandler(this.menuItem1_Click);

// Set up how the form should be displayed.
this.ClientSize = new System.Drawing.Size(292, 266);
this.Text = "Notify Icon Example";

// Create the NotifyIcon.
this.notifyIcon1 = new System.Windows.Forms.NotifyIcon(this.components);

// The Icon property sets the icon that will appear
// in the systray for this application.
notifyIcon1.Icon = new Icon("appicon.ico");

// The ContextMenu property sets the menu that will
// appear when the systray icon is right clicked.
notifyIcon1.ContextMenu = this.contextMenu1;

// The Text property sets the text that will be displayed,
// in a tooltip, when the mouse hovers over the systray icon.
notifyIcon1.Text = "Form1 (NotifyIcon example)";
notifyIcon1.Visible = true;

// Handle the DoubleClick event to activate the form.
notifyIcon1.DoubleClick += new System.EventHandler(this.notifyIcon1_DoubleClick);

}

protected override void Dispose( bool disposing )
{
// Clean up any components being used.
if( disposing )
if (components != null)
components.Dispose();

base.Dispose( disposing );
}

private void notifyIcon1_DoubleClick(object Sender, EventArgs e)
{
// Show the form when the user double clicks on the notify icon.

// Set the WindowState to normal if the form is minimized.
if (this.WindowState == FormWindowState.Minimized)
this.WindowState = FormWindowState.Normal;

// Activate the form.
this.Activate();
}

private void menuItem1_Click(object Sender, EventArgs e) {
// Close the form, which closes the application.
this.Close();
}
}