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Process[] processes1 = Process.GetProcessesByName("XXX.exe"); //xxx表示项目名
 if (processes1.Length<1)
                    {
                          OpenExe.StartProcess("XXX.exe", Application.StartupPath + @"\XXX.exe");
                    }
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原文地址:http://www.cnblogs.com/yanglovezhi/p/5328491.html