C# WinForm主畫面基本程式

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/// <summary>         /// 應用程式的主進入點。         /// </summary>         [STAThread]         static void Main()         {             CustomExceptionHandler eh = new CustomExceptionHandler();             Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(eh.OnThreadException);             Process instance = RunningInstance();             if (instance == null)             {                 Application.EnableVisualStyles();                 Application.DoEvents();                 Application.Run(new frmMain());             }             else             {                 MessageBox.Show("目前已有啟動!　　", "請確認", MessageBoxButtons.OK, MessageBoxIcon.Information);                 HandleRunningInstance(instance);                 Application.Exit();             }         }         internal class CustomExceptionHandler         {             public void OnThreadException(object sender, System.Threading.ThreadExceptionEventArgs t)             {                 MessageBox.Show("無法預期的錯誤發生，錯誤訊息如下： \n \n" + t.Exception.Message + t.Exception.StackTrace);                 Application.Exit();             }         }                  #region 檢查是否已啟動程式         private static Process RunningInstance()         {             Process current = Process.GetCurrentProcess();             Process[] processes = Process.GetProcessesByName(current.ProcessName);             //Loop through  the running processes in with the same name                   foreach (Process process in processes)             {                 //Ignore   the   current   process                      if (process.Id != current.Id)                 {                     //Make sure that the process is running from the exe file.                           if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)                     {                         //Return   the   other   process   instance.                              return process;                     }                 }             }             //No other instance was found, return null.                 return null;         }         private static void HandleRunningInstance(Process instance)         {             //Make sure the window is not minimized or maximized                 ShowWindowAsync(instance.MainWindowHandle, WS_SHOWNORMAL);             //Set the real intance to foreground window                SetForegroundWindow(instance.MainWindowHandle);         }         [DllImport("User32.dll")]         private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);         [DllImport("User32.dll")]         private static extern bool SetForegroundWindow(IntPtr hWnd);         //1:normal   2:minimized   3:maximized            private const int WS_SHOWNORMAL = 3;         #endregion                  private void frmMain_Load(object sender, System.EventArgs e)         {             //登入的子視窗             m_loginFrm = (Form)LoginUIFactory.getLoginInstance(APP_NAME);             m_loginFrm.ShowDialog();             if (m_loginFrm.Tag == null || m_loginFrm.Tag.ToString().IndexOf(":") == -1)             {                 Application.Exit();                 return;             }             userID = m_loginFrm.Tag.ToString().Split(":".ToCharArray()[0])[1];             tslLoginID.Text = "登入身份：" + userID;             this.toolStripStatusLabel1.Text = "就緒";         }                  private void frmMain_MdiChildActivate(object sender, EventArgs e)         {             if (this.ActiveMdiChild != null)                 this.toolStripStatusLabel1.Text = this.ActiveMdiChild.Text;             else                 this.toolStripStatusLabel1.Text = "就緒";         }                  private void MenuItem1ToolStripMenuItem_Click(object sender, EventArgs e)         {             if (checkOpenSubWin("MenuItem1subForm") == true)                 return;             MenuItem1subForm frm = new MenuItem1subForm();             frm.MdiParent = this;             frm.Show();             this.toolStripStatusLabel1.Text = frm.Text;           }                  #region 視窗基本功能         private void 重疊顯示ToolStripMenuItem_Click(object sender, EventArgs e)         {             this.LayoutMdi(System.Windows.Forms.MdiLayout.Cascade);         }         private void 水平並排ToolStripMenuItem_Click(object sender, EventArgs e)         {             this.LayoutMdi(System.Windows.Forms.MdiLayout.TileHorizontal);         }         private void 垂直並排ToolStripMenuItem_Click(object sender, EventArgs e)         {             this.LayoutMdi(System.Windows.Forms.MdiLayout.TileVertical);         }         private void 全部最大化ToolStripMenuItem_Click(object sender, EventArgs e)         {             Form[] charr = this.MdiChildren;             foreach (Form chform in charr)             {                 if (chform.MaximizeBox)                     chform.WindowState = FormWindowState.Maximized;                 else                     chform.WindowState = FormWindowState.Normal;             }         }         private void 全部最小化ToolStripMenuItem_Click(object sender, EventArgs e)         {             Form[] charr = this.MdiChildren;             foreach (Form chform in charr)                 chform.WindowState = FormWindowState.Minimized;         }         private void 全部關閉ToolStripMenuItem_Click(object sender, EventArgs e)         {             Form[] charr = this.MdiChildren;             foreach (Form chform in charr)                 chform.Close();         }         private void myItem_Click(object sender, EventArgs e)         {             this.checkOpenSubWin(((ToolStripMenuItem)sender).Tag.ToString());         }         private void menuStrip1_MenuActivate(object sender, EventArgs e)         {             // 讓視窗選單列出開啟中的子視窗，可在此切換點選已開啟的子視窗             if (this.視窗ToolStripMenuItem.DropDownItems.Count > 10)             {                 for (int i = this.視窗ToolStripMenuItem.DropDownItems.Count - 1; i > 9; i--)                     this.視窗ToolStripMenuItem.DropDownItems.RemoveAt(i);             }             if (this.MdiChildren.Length > 0)                 this.視窗ToolStripMenuItem.DropDownItems.Add(new ToolStripSeparator());             foreach (Form frm in this.MdiChildren)             {                 ToolStripMenuItem myItem = new ToolStripMenuItem(frm.Text);                 myItem.Tag = frm.Name;                 myItem.Click += new EventHandler(myItem_Click);                 if (this.ActiveMdiChild.Name == frm.Name)                     myItem.CheckState = CheckState.Checked;                 this.視窗ToolStripMenuItem.DropDownItems.Add(myItem);             }         }         public bool checkOpenSubWin(string chkName)         {             foreach (Form frm in this.MdiChildren)             {                 if (frm.Name == chkName)                 {                     frm.Activate();                     if (frm.MaximizeBox)                         frm.WindowState = FormWindowState.Maximized;                     else                         frm.WindowState = FormWindowState.Normal;                     return true;                 }             }             return false;         }         public void CloseSubWin(string chkName)         {             foreach (Form frm in this.MdiChildren)             {                 if (frm.Name == chkName)                 {                            frm.Close();                     return;                 }             }         }         private void 關於ToolStripMenuItem_Click(object sender, EventArgs e)         {             new About().ShowDialog();         }         private void 離開ToolStripMenuItem_Click(object sender, EventArgs e)         {             Form[] charr = this.MdiChildren;             foreach (Form chform in charr)                 chform.Close();             Application.Exit();         }         #endregion