什么是我误解有关如何Html.TextBoxFor作品 [英] What am I misunderstanding about how Html.TextBoxFor works

问题描述

我只是试图重新进入.NET MVC的新版本，我不能让我的头一轮的方式可以查看绑定到数据模型。

I'm just trying to get back into .NET MVC with the new release and I can't get my head round the way may view is binding to the DataModel.

我有一个属性FIRST_NAME和HTML表单我有以下范围内的模型

I have a model with a property "first_name" and within an HTML form I have the following

<%= Html.TextBox("first_name", Model.first_name)%>
<%= Html.TextBoxFor(model => model.first_name) %> 
<input type="text" name="first_name" id="first_name" class="myLabel" 
       value="<%=Model.first_name %>" />

在一个控制器上的行动，如果我把我的模型FIRST_NAME财产并做

In an action on a controller if I set the first_name property on my model and do

mymodelObject.first_name = "Test";
return View(mymodelObject);

什么是只有第三个文本框在这个FIRST_NAME值回升，另外两个没有什么原因呢？

What is the reason only the third textbox picks up on this first_name value and the other two don't?

编辑：

我可能没有解释这个不够好，对不起。想象一下，我有2个控制器方法 -

I probably haven't explained this well enough, sorry. Imagine I have 2 controller methods -

public ActionResult Register()
{
    Registration model = new Registration();
    model.first_name = "test";
    return View(model);
}

通过这一个或者绑定的工作。

With this one either binding works.

在此已经显示我，然后单击窗体上的一个按钮，并尝试并运行此：

After this has been displayed I then click a button on the form and try and run this:

[HttpPost]
public ActionResult Register(Registration_ViewData model)
{
    model.first_name = "Steve";
    return View(model);
}

什么我问的是为什么第三，但不是第2绑定到史蒂夫作为新名称。

What I'm asking is why does the 3rd but not the first 2 bind to "Steve" as the new name.

推荐答案

由于HTML助手宣读了ModelState中，而不是从模型的价值。为了这种行为，你需要用的ModelState工作以及变化。结果
（参见：<一href=\"http://stackoverflow.com/questions/707569/asp-net-mvc-changing-models-properties-on-postback\">Changing模型对回传属性）

Because HTML helpers read the value from the ModelState and not from the model. In order the change that behavior you'll need to work with the ModelState as well.
(see: Changing model’s properties on postback)

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