防止winform进程重复运行

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;

namespace ZSYH
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            int processCount = 0;
            Process[] ps = Process.GetProcesses();
            foreach (Process item in ps)
            {
                if (item.ProcessName.Equals(Process.GetCurrentProcess().ProcessName))
                    processCount++;
            }

            if (processCount>1)
            {
                MessageBox.Show(string.Format("{0} 已在运行！", Process.GetCurrentProcess().ProcessName)
                    ,"退出程序"
                    ,MessageBoxButtons.OK
                    ,MessageBoxIcon.Error);
                return;
            }

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}