如何在所有控制器上处理空模型aspnet核心c#

[HttpPost]
public IActionResult MyAction(MyModel model)
{
    if (model == null)
    {
        ModelState.AddModelError("", "模型不能为空");
        return View();
    }

    if (!ModelState.IsValid)
    {
        return View(model);
    }

    // 处理有效的模型
    return RedirectToAction("Success");
}

[HttpPost]
public IActionResult MyAction(MyModel model)
{
    if (model == null)
    {
        model = new MyModel(); // 设置默认值
    }

    // 处理模型
    return RedirectToAction("Success");
}

[HttpPost]
public IActionResult MyAction(MyModel model = null)
{
    if (model == null)
    {
        // 处理空模型的情况
    }

    // 处理模型
    return RedirectToAction("Success");
}