winform鼠标滚轮事件

 #region 进入窗体时加载

 public FormAlarmInfoQuery()
 {
     InitializeComponent();
     pictureBox1.ImageLocation = "f:\\1.jpg";

          this.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);
          //判断是否已安装带滚轮的鼠标
     //SystemInformation.MouseWheelPresent.ToString();
     //获取鼠标滚轮在滚动时所获得的行数
     //SystemInformation.MouseWheelScrollLines.ToString();
     //判断该操作系统是否支持滚轮鼠标
     //SystemInformation.NativeMouseWheelSupport.ToString();
 }

 #endregion

 private void panel1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
 {
     MessageBox.Show("滚动事件已被捕捉");
     System.Drawing.Size t = pictureBox1.Size;
     t.Width += e.Delta;
     t.Height += e.Delta;
     pictureBox1.Width = t.Width;
     pictureBox1.Height = t.Height;
 }

下面是鼠标控制音乐播放器音量事件

         public Form1()
         {
             InitializeComponent();
             this.btnjin.MouseWheel += new MouseEventHandler(btnjin_MouseWheel);

         }
         int m1=;
         private void btnjin_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
         {
             if(m1>=&&m1<=)
             {
                 m1 += e.Delta / ;
                 if (m1 > )
                 {
                     m1 = ;
                 }
                 else if (m1 < )
                 {
                     m1 = ;
                 }
                 lblvol.Width = ( / ) * m1 / ;
                 Music.settings.volume = m1 ;
             }

         }

         private void btnjin_MouseEnter(object sender, EventArgs e)
         {
             panel2.Visible = true;
         }

         private void btnjin_MouseLeave(object sender, EventArgs e)
         {
             panel2.Visible = false;
         }