Win32 程序在启动时激活前一个启动程序的窗口

[STAThread]
static void Main(string[] args)
{
    var current = Process.GetCurrentProcess();
    var process = Process.GetProcessesByName(current.ProcessName).FirstOrDefault(x => x.Id != current.Id);
    if (process != null)
    {
        var hwnd = process.MainWindowHandle;
        ShowWindow(hwnd, 9);
        return;
    }

    // 启动自己的主窗口，此部分代码省略。
}

[DllImport("user32.dll")]
private static extern int ShowWindow(IntPtr hwnd, uint nCmdShow);

[DllImport("USER32.DLL")]
public static extern bool SetForegroundWindow(IntPtr hWnd);

var hwnd = process.MainWindowHandle;
ShowWindow(hwnd, 9);
SetForegroundWindow(hwnd);

[STAThread]
static void Main(string[] args)
{
    var hwnd = FindWindow(null, "那个窗口的标题栏文字");
    if (hwnd != IntPtr.Zero)
    {
        ShowWindow(hwnd, 9);
        return;
    }

    // 启动自己的主窗口，此部分代码省略。
}

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);