C#实现winform渐变效果的方法

static void Main() 
{ 
  Application.EnableVisualStyles(); 
  Application.SetCompatibleTextRenderingDefault(false); 
  Application.Run(new Aform()); 
}

public partial class Aform: Form 
{ 
       public Form() 
       { 
           InitializeComponent();  
       } 
 
       private void Start_Load(object sender, EventArgs e) 
       { 
           StartWindowShowTime.Start(); 
           HideWindowStart.Start(); 
       } 
 
       private void ShowMainwindow(object sender, EventArgs e) 
       { 
           Bform showmainwindows = new Bform();             
           this.Hide(); 
           StartWindowShowTime.Stop(); 
           HideWindowStart.Stop(); 
           HideWindowSpeed.Stop(); 
           showmainwindows.ShowDialog(); 
           this.Close(); 
       } 
 
       private void HideWindow(object sender, EventArgs e) 
       { 
           HideWindowSpeed.Start(); 
       } 
 
       private void HideWindowSpeedStart(object sender, EventArgs e) 
       { 
           this.Opacity = this.Opacity - 0.02; 
       } 
 
       private void ShowWindow(object sender, EventArgs e) 
       { 
           if (this.Opacity == 1) 
           { 
               ShowWindowStart.Stop(); 
           } 
           else 
           { 
               this.Opacity = this.Opacity + 0.02; 
           } 
       } 
}