C#代码实现，确保windows程序只有一个实例（instance）

 

        ///<summary>

        ///应用程序的主入口点。

        ///</summary>

        [STAThread]

        staticvoid Main()

        {

            //防止程序多次运行

            if(!OneInstance.IsFirst("GetPayInfo"))

            {

                MessageBox.Show ("警告:程序正在运行中! 请不要重复打开程序!可在右下角系统栏找到!","程序错误提示:",MessageBoxButtons.OK,MessageBoxIcon.Stop);

                return;

            }

            Application.Run(new Form1());

        }

        // ******************* 防止程序多次执行 **************************

        publicabstractclass OneInstance

        {

            ///<summary>

            ///判断程序是否正在运行

            ///</summary>

            ///<param name="appId">程序名称</param>

            ///<returns>如果程序是第一次运行返回True,否则返回False</returns>

            publicstaticbool IsFirst(string appId)

            {

                bool ret=false;

                if(OpenMutex(0x1F0001,0,appId)==IntPtr.Zero)

                {

                    CreateMutex(IntPtr.Zero,0,appId);

                    ret=true;

                }

                return ret;

            }  

            [DllImport("Kernel32.dll",CharSet=CharSet.Auto)]

            privatestaticextern IntPtr OpenMutex(

                uint dwDesiredAccess, // access

                int bInheritHandle,    // inheritance option

                string lpName          // object name

                );

 

            [DllImport("Kernel32.dll",CharSet=CharSet.Auto)]

            privatestaticextern IntPtr CreateMutex(

                IntPtr lpMutexAttributes, // SD

                int bInitialOwner,                       // initial owner

                string lpName                            // object name

                );

        }