NotifyIcon 类

指定在通知区域中创建图标的组件。无法继承此类。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
Public NotInheritable Class NotifyIcon
    Inherits Component
用法
Dim instance As NotifyIcon

public sealed class NotifyIcon : Component

public ref class NotifyIcon sealed : public Component

public final class NotifyIcon extends Component

public final class NotifyIcon extends Component

备注

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。

Imports System
Imports System.Drawing
Imports System.Windows.Forms

Public NotInheritable Class Form1
    Inherits System.Windows.Forms.Form

    Private contextMenu1 As System.Windows.Forms.ContextMenu
    Friend WithEvents menuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents notifyIcon1 As System.Windows.Forms.NotifyIcon
    Private components As System.ComponentModel.IContainer

    <System.STAThread()> _
    Public Shared Sub Main()
        System.Windows.Forms.Application.Run(New Form1)
    End Sub 'Main

    Public Sub New()

        Me.components = New System.ComponentModel.Container
        Me.contextMenu1 = New System.Windows.Forms.ContextMenu
        Me.menuItem1 = New System.Windows.Forms.MenuItem

        ' Initialize contextMenu1
        Me.contextMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() _
                            {Me.menuItem1})

        ' Initialize menuItem1
        Me.menuItem1.Index = 0
        Me.menuItem1.Text = "E&xit"

        ' Set up how the form should be displayed.
        Me.ClientSize = New System.Drawing.Size(292, 266)
        Me.Text = "Notify Icon Example"

        ' Create the NotifyIcon.
        Me.notifyIcon1 = New System.Windows.Forms.NotifyIcon(Me.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 = Me.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
    End Sub 'New
    
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        ' Clean up any components being used.
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub 'Dispose

    Private Sub notifyIcon1_DoubleClick(Sender as object, e as EventArgs) handles notifyIcon1.DoubleClick
        ' Show the form when the user double clicks on the notify icon.

        ' Set the WindowState to normal if the form is minimized.
        if (me.WindowState = FormWindowState.Minimized) then _
            me.WindowState = FormWindowState.Normal

        ' Activate the form.
        me.Activate()
    end sub

    Private Sub menuItem1_Click(Sender as object, e as EventArgs) handles menuItem1.Click
        ' Close the form, which closes the application.
        me.Close()
    end sub

End Class 'Form1

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();
    }
}

#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
public ref class Form1: public System::Windows::Forms::Form
{
private:
   System::Windows::Forms::NotifyIcon^ notifyIcon1;
   System::Windows::Forms::ContextMenu^ contextMenu1;
   System::Windows::Forms::MenuItem^ menuItem1;
   System::ComponentModel::IContainer^ components;

public:
   Form1()
   {
      this->components = gcnew System::ComponentModel::Container;
      this->contextMenu1 = gcnew System::Windows::Forms::ContextMenu;
      this->menuItem1 = gcnew System::Windows::Forms::MenuItem;
      
      // Initialize contextMenu1
      array<System::Windows::Forms::MenuItem^>^temp0 = {this->menuItem1};
      this->contextMenu1->MenuItems->AddRange( temp0 );
      
      // Initialize menuItem1
      this->menuItem1->Index = 0;
      this->menuItem1->Text = "E&xit";
      this->menuItem1->Click += gcnew System::EventHandler( this, &Form1::menuItem1_Click );
      
      // Set up how the form should be displayed.
      this->ClientSize = System::Drawing::Size( 292, 266 );
      this->Text = "Notify Icon Example";
      
      // Create the NotifyIcon.
      this->notifyIcon1 = gcnew System::Windows::Forms::NotifyIcon( this->components );
      
      // The Icon property sets the icon that will appear
      // in the systray for this application.
      notifyIcon1->Icon = gcnew System::Drawing::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 += gcnew System::EventHandler( this, &Form1::notifyIcon1_DoubleClick );
   }

protected:
   ~Form1()
   {
      if ( components != nullptr )
      {
         delete components;
      }
   }

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();
   }

   void menuItem1_Click( Object^ /*Sender*/, EventArgs^ /*e*/ )
   {
      
      // Close the form, which closes the application.
      this->Close();
   }

};

[STAThread]
int main()
{
   Application::Run( gcnew Form1 );
}

import System.*;
import System.Drawing.*;
import System.Windows.Forms.*;

public class Form1 extends 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;

    /** @attribute STAThread()
     */
    public static void main(String[] args)
    {
        Application.Run(new Form1());
    } //main

    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.get_MenuItems().AddRange(
            new System.Windows.Forms.MenuItem[] { this.menuItem1 });
        // Initialize menuItem1
        this.menuItem1.set_Index(0);
        this.menuItem1.set_Text("E&xit");
        this.menuItem1.add_Click(new System.EventHandler(this.menuItem1_Click));
        // Set up how the form should be displayed.
        this.set_ClientSize(new System.Drawing.Size(292, 266));
        this.set_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.set_Icon(new Icon("appicon.ico"));
        // The ContextMenu property sets the menu that will
        // appear when the systray icon is right clicked.
        notifyIcon1.set_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.set_Text("Form1 (NotifyIcon example)");
        notifyIcon1.set_Visible(true);
        // Handle the DoubleClick event to activate the form.
        notifyIcon1.add_DoubleClick(
            new System.EventHandler(this.notifyIcon1_DoubleClick));
    } //Form1

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

        super.Dispose(disposing);
    } //Dispose

    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.get_WindowState().Equals(FormWindowState.Minimized)) {
            this.set_WindowState(FormWindowState.Normal);
        }
        // Activate the form.
        this.Activate();
    } //notifyIcon1_DoubleClick

    private void menuItem1_Click(Object Sender, EventArgs e)
    {
        // Close the form, which closes the application.
        this.Close();
    } //menuItem1_Click
} //Form1

.NET Framework 安全性

• UIPermission  用于创建 NotifyIcon 组件。关联的枚举：UIPermissionWindow.AllWindows

继承层次结构

System.Object
   System.MarshalByRefObject
     System.ComponentModel.Component
      System.Windows.Forms.NotifyIcon

线程安全

此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

请参见

参考

NotifyIcon 成员
System.Windows.Forms 命名空间