WinForm程序只运行一次

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace CaiPiaoBa
{
    static class Program
    {
        /// <summary>
        /// API 查找窗体
        /// </summary>
        /// <param name="classname"></param>
        /// <param name="title"></param>
        /// <returns></returns>
        [DllImport("user32.dll")]
        private static extern IntPtr FindWindow(String classname, String title);
        /// <summary>
        /// API 显示查找到的窗体
        /// </summary>
        /// <param name="hWnd"></param>
        /// <param name="cmdShow"></param>
        /// <returns></returns>
        [DllImport("User32.dll")]
        private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow);
        /// <summary>
        /// API 窗体置于最前
        /// </summary>
        /// <param name="hwnd"></param>
        [DllImport("user32.dll")]
        private static extern void SetForegroundWindow(IntPtr hwnd);

        // 0-Hidden, 1-Centered, 2-Minimized, 3-Maximized
        private const int WS_SHOWNORMAL = 1;

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            string curProc = Process.GetCurrentProcess().ProcessName;
            if (Process.GetProcessesByName(curProc).Length != 0)
            {
                try
                {
                    IntPtr ip = FindWindow(null, "彩票吧");
                    if (ip != IntPtr.Zero)
                    {
                        ShowWindowAsync(ip, WS_SHOWNORMAL);
                        SetForegroundWindow(ip);
                        return;
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "彩票吧", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
            }
            Application.Run(new frmCaiPiao());
        }
    }
}
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