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bool isRunning;
System.Threading.Mutex mutex = new System.Threading.Mutex(true, "OnlyRunOneInstance", out isRunning);
if (isRunning)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
else
{
MessageBox.Show("程序已启动", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}