SingleInstanceApplication_Class.zip
   1:  using System;
   2:  using System.Windows.Forms;
   3:  using System.IO;
   4:  using System.Runtime.InteropServices;
   5:  using Microsoft.VisualBasic.ApplicationServices;
   6:   
   7:  namespace YourApplicationNamespace
   8:  {
   9:      class SingleInstanceApplication : WindowsFormsApplicationBase
  10:      {
  11:          [DllImport("user32.dll")]
  12:          static extern bool SetForegroundWindow(IntPtr hWnd);
  13:   
  14:          public SingleInstanceApplication()
  15:          {
  16:              this.IsSingleInstance = true;
  17:              this.EnableVisualStyles = true;
  18:              this.Startup += new StartupEventHandler(SingleInstanceApplication_Startup);
  19:              this.StartupNextInstance += new StartupNextInstanceEventHandler(SingleInstanceApplication_StartupNextInstance);
  20:          }
  21:   
  22:          ~SingleInstanceApplication()
  23:          {
  24:              this.Startup -= new StartupEventHandler(SingleInstanceApplication_Startup);
  25:              this.StartupNextInstance -= new StartupNextInstanceEventHandler(SingleInstanceApplication_StartupNextInstance);
  26:          }
  27:   
  28:          void SingleInstanceApplication_StartupNextInstance(object sender, StartupNextInstanceEventArgs eventArgs)
  29:          {
  30:              foreach (string s in eventArgs.CommandLine)
  31:              {
  32:                  foreach (string ThisFileName in Directory.GetFiles(Path.GetDirectoryName(s), Path.GetFileName(s), SearchOption.TopDirectoryOnly))
  33:                  {
  34:                      ((ManagerMDI)this.MainForm).OpenFile(ThisFileName);
  35:                  }
  36:              }
  37:              SetForegroundWindow(this.MainForm.Handle);
  38:          }
  39:   
  40:          void SingleInstanceApplication_Startup(object sender, StartupEventArgs eventArgs)
  41:          {
  42:              this.MainForm = new ManagerMDI(null);
  43:              foreach (string s in eventArgs.CommandLine)
  44:              {
  45:                  foreach (string ThisFileName in Directory.GetFiles(Path.GetDirectoryName(s), Path.GetFileName(s), SearchOption.TopDirectoryOnly))
  46:                  {
  47:                      ((ManagerMDI)this.MainForm).OpenFile(ThisFileName);
  48:                  }
  49:              }
  50:              SetForegroundWindow(this.MainForm.Handle);
  51:          }
  52:      }
  53:   
  54:      static class Program
  55:      {
  56:          /// <summary>
  57:          /// The main entry point for the application.
  58:          /// This application is a single-instance application.
  59:          /// </summary>
  60:          /// 
  61:          [STAThread]
  62:          static void Main(string[] args)
  63:          {
  64:              Application.SetCompatibleTextRenderingDefault(false);
  65:              SingleInstanceApplication app = new SingleInstanceApplication();
  66:              app.Run(args);
  67:          }
  68:      }
  69:  }