開機畫面變成黑色6秒

我有一個閃屏，我使用它時，我從一個智能卡裝載數據，因爲它需要大約35秒來獲取數據我的加載屏幕有一個白色的背景色和我設置後將TransparencyKey設置爲白色以使屏幕透明。和它工作正常，但大約6秒後回顏色變爲黑色這裏是加載屏幕的代碼：開機畫面變成黑色6秒

partial class LoadingForm : Form 
{ 
    int tickcount = 0; 
    public bool CloseIt = false; 
    public string Message = "من فضلك إنتظر قليلا ..."; 
    public Point LocationPoint; 
    public LoadingForm() 
    { 
     SetStyle(ControlStyles.UserPaint, true); 
     SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.SupportsTransparentBackColor | ControlStyles.DoubleBuffer, true); 
     InitializeComponent(); 
     SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.SupportsTransparentBackColor | ControlStyles.DoubleBuffer, true); 
     LocationPoint = new Point(); 
     LocationPoint.X = -300; 
     LocationPoint.Y = -300; 
     lblMessage.Text = Message; 

    } 

    private void LoadingForm_Load(object sender, EventArgs e) 
    { 
     Left = LocationPoint.X; 
     Top = LocationPoint.Y; 
     timer1.Start(); 

    } 

    private void timer1_Tick(object sender, EventArgs e) 
    { 
     if (Created) 
     { 
      if (tickcount++ == 1) 
      { 
       LocationPoint.X = Screen.PrimaryScreen.Bounds.Width/2 - 240; 
       LocationPoint.Y = Screen.PrimaryScreen.Bounds.Height/2 - 140; 
       lblMessage.Text = Message; 

       Left = LocationPoint.X; 
       Top = LocationPoint.Y; 
       Width = 480; 
       Height = 185; 
      } 
      if (CloseIt) 
      { 
       pictureBox1.Image = null; 
       Close(); 
       Application.ExitThread(); 
      } 
     } 
    } 

    private void LoadingForm_FormClosing(object sender, FormClosingEventArgs e) 
    { 
     timer1.Stop(); 
     timer1.Dispose(); 
    } 
}

這是創建一個線程在其上運行的形式類：

public class LoadingProgress 
{ 
    LoadingForm frm = new LoadingForm(); 
    string Message = "من فضلك إنتظر قليلا ..."; 
    Thread th; 

    public void StartProgress() 
    { 
     th = new Thread(new ThreadStart(ShowForm)); 
     if (frm == null) 
      frm = new LoadingForm(); 
     frm.Message = Message; 
     th.Start(); 
    } 

    public void Set_Message(string msg) 
    { 
     Message = msg; 
     frm.Message = Message; 
    } 

    void ShowForm() 
    { 
     frm.ShowDialog(); 

     frm.Dispose(); 
     frm = null; 

     if (th.ThreadState == ThreadState.Running) 
      th.Abort(); 
    } 

    public void Stop() 
    { 
     frm.CloseIt = true; 
    } 

    public void Set_Position(System.Drawing.Point p) 
    { 
     frm.LocationPoint = p; 
    } 
}

來源

2011-08-17 Dark_Knight