防止程序重复运行，显示原来的窗口解决方案

防止程序重复运行，显示原来的窗口
请问熟悉winform的前辈们，如何实现：防止winform程序重复运行，
重复运行了，显示最先打开的窗口(要是最先打开的窗口是最小化的话)。谢谢！

[解决办法]

C# code

            bool bOnlyOneInstance = false;                System.Threading.Mutex mutex = new System.Threading.Mutex(true, Application.UserAppDataPath.Replace(@"\", "_"), out bOnlyOneInstance);                if (!bOnlyOneInstance)                {                    MessageBox.Show("系统已经运行!", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Information);                    System.Environment.Exit(0);                    return;                }
[解决办法]
判断的方法
C# code
/// <summary>        /// 判断系统是否已打开        /// </summary>        /// <returns></returns>        private bool IsExistCurrentProcess()        {            bool functionReturnValue = false;            bool bTemp = false;            try            {                string assemblyName = Assembly.GetExecutingAssembly().GetName().Name;                Process current = Process.GetCurrentProcess();                Process[] processes = Process.GetProcessesByName(assemblyName);                foreach (Process pro in processes)                {                    if (current.Id != pro.Id)                    {                        bTemp = true;                        break; // TODO: might not be correct. Was : Exit For                    }                }                functionReturnValue = bTemp;            }            catch            {                functionReturnValue = bTemp;            }            return functionReturnValue;        }
[解决办法]
用放射查找 你知道它的名字吧
[解决办法]
是否运行可以遍历进行表，也可以用windows的api: FindWindow(null,"你程序的窗体名称") ;
[DllImport("user32.dll")]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

如果程序窗口存在，它返回窗口的句柄。

显示窗口的windows api showWindow(Findwindow找到的窗口句柄,5);
[DllImport("user32.dll")]
private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);
第二个参数nCmdShow：
#define SW_HIDE             0
#define SW_SHOWNORMAL       1
#define SW_NORMAL           1
#define SW_SHOWMINIMIZED    2
#define SW_SHOWMAXIMIZED    3
#define SW_MAXIMIZE         3
#define SW_SHOWNOACTIVATE   4
#define SW_SHOW             5
#define SW_MINIMIZE         6
#define SW_SHOWMINNOACTIVE  7
#define SW_SHOWNA           8
#define SW_RESTORE          9
#define SW_SHOWDEFAULT      10
#define SW_FORCEMINIMIZE    11
#define SW_MAX              11


[解决办法]
用反射,通过窗体的名字来反射窗体实例
探讨

引用:
if (IsExistCurrentProcess())
{
form.Visible = true;
form.WindowState = FormWindowState.Normal;
form.Show();
}

引用:
引用:
判断的方法

……

[解决办法]
C# code
bool runone;                System.Threading.Mutex run = new System.Threading.Mutex(true, "Frm", out runone);                if (!runone)                {                    MessageBox.Show("程序已经运行,不能重复打开！", "提示", MessageBoxButtons.OK);                    return;                }
[解决办法]
单例模式

打开A窗口  

  A a=A.GetInstance();
a.show();
  


A窗口中
       public static ManagerList form = null; 
 

       public static ManagerList GetInstance()
       {
           if (form == null || form.IsDisposed)
           {
               form = new ManagerList ();
           }
           return form;
       }