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//该程序进程数
int processCount = 0;
//系统进程集
Process[] processes = Process.GetProcesses();
foreach (Process process in processes)
{
if (process.ProcessName == Process.GetCurrentProcess().ProcessName)
{
processCount += 1;
}
}
if(0 < processCount)
{
MessageBox.Show("程序已启动。","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
}