C# Winform不重复运行程序

/// <summary>
/// 不重复运行程序
/// </summary>
/// <returns></returns>
private static Process RunningInstance()
{
Process current = Process.GetCurrentProcess();
Process[] processes = Process.GetProcessesByName(current.ProcessName);
//遍历与当前进程名称相同的进程列表 
foreach (Process process in processes)
{
//如果实例已经存在则忽略当前进程 
if (process.Id != current.Id)
{
//保证要打开的进程同已经存在的进程来自同一文件路径
if (Assembly.GetExecutingAssembly().Location.Replace("/", "\\") == current.MainModule.FileName)
{
//返回已经存在的进程
return process;
}
}
}
return null;
}

// 将窗口放置最前端
[DllImport("User32.dll")]
private static extern bool ShowWindowAsync(System.IntPtr hWnd, int cmdShow);
[DllImport("User32.dll")]
private static extern bool SetForegroundWindow(System.IntPtr hWnd);

private static void HandleRunningInstance(Process instance)
{
    ShowWindowAsync(instance.MainWindowHandle, 1); //调用api函数，正常显示窗口
    SetForegroundWindow(instance.MainWindowHandle); //将窗口放置最前端
}

Program

            Process instance = RunningInstance();
            if (instance == null)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Form1());
            }
            else
            {
                //1.2 已经有一个实例在运行
                HandleRunningInstance(instance);
            }