C#程式多使用者只啟動一個進程的方法[轉載]

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http://greenlandy.blogbus.com/logs/14388828.html

Code Snippet

1. [STAThread]
2.      private static void Main()
3.      {
4.          Application.EnableVisualStyles();
5.          Application.SetCompatibleTextRenderingDefault(false);
6.          var wb = new Form1();
7.          Process current = Process.GetCurrentProcess();
8.          bool newinstance = true;
9.          Process[] processes = Process.GetProcessesByName(current.ProcessName);
10.  
11.          //?曆正在有相同名字??的常式  
12.          foreach (Process process in processes)
13.          {
14.              //忽略現有的常式  
15.              if (process.Id != current.Id)
16.              {
17.                  //確保常式從EXE檔案??  
18.                  if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
19.                  {
20.                      //?回另一個常式執行個體  
21.                      current = process;
22.                      newinstance = false;
23.                      break;
24.                  }
25.              }
26.          }
27.          if (newinstance)
28.          {
29.              Application.Run(wb);
30.          }
31.          else
32.          {
33.              ShowWindowAsync(current.MainWindowHandle, 1);
34.  
35.              //?置真執行個體程為foreground   window  
36.              SetForegroundWindow(current.MainWindowHandle);
37.          }
38.      }

引入這兩個API函數

Code Snippet

1. [DllImport("User32.dll")]
2. private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
3.  
4. [DllImport("User32.dll")]
5. private static extern bool SetForegroundWindow(IntPtr hWnd);