MVC在回发后保留值 [英] Mvc retain values after postback

问题描述

我有一个简单的TestController类和用户模型:

I have a simple TestController class and User model:

public class TestController : Controller
{
    public ActionResult TestAction()
    {
        return View();
    }

    [HttpPost]
    public ActionResult TestAction(User user)
    {
        return View();
    }
}

public class User
{
    public int Id { get; set; }

    public string Name { get; set; }

    public int Age { get; set; }
}

这是我的表格:

据我所知，MVC是无状态的，并且没有viewstate概念.但是，将数据发布到我的控制器后，当我返回视图时，我所有的数据都在那里.我希望有空字段，但它们都充满了已发布的数据.我不明白MVC在回发后如何知道这些值?

As far as I know MVC is stateless and it does not have a viewstate concept. But after posting the data to my controller and when I return the view, all my data is there. I expect empty fields but they are all filled with the posted data. I could not understand how MVC knows the values after postback?

推荐答案

@ stephen.vakil

@stephen.vakil

从HttpPost返回View时，假定您正在处理错误情况.它将发布的数据保留在ModelState中，然后在页面上重新填充数据，以便用户可以对其进行纠正.

When you return a View from an HttpPost the assumption is that you are handling an error condition. It will keep the posted data in the ModelState and re-fill the data on the page so that the user can correct it.

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