Hiddenfor没有得到从视图模型正确的值 [英] Hiddenfor not getting correct value from view model

问题描述

我有一个多步骤的文件导入过程。我有我的观点，我想从视图模型的CurrentStep来填充一个隐藏的表单输入。

I have a multi-step file import process. I have a hidden form input in my view that I am trying to populate with the "CurrentStep" from the view model.

<% = Html.HiddenFor(model => model.CurrentStep) %>

CurrentStep是一个枚举，我总是得到默认值，而不是我的视图模型提供的之一。在另一方面，这让我正确的值：

CurrentStep is an Enum and I always get the default value rather than the one I provided to the view model. on the other hand this gets me the correct value:

<p><% = Model.CurrentStep %></p>

我知道我可以只手code隐藏的输入，但我想知道：我究竟做错了什么？有没有更好的方法来跟踪岗位之间当前步骤？

I realise I could just hand code the hidden input but I want to know: what am I doing wrong? Is there a better way to keep track of the current step between POSTs?

先谢谢了。

推荐答案

你在做什么错的是你要修改你的控制器动作贴出变量的值。所以我想你想做到这一点：

What you are doing wrong is that you are trying to modify the value of a POSTed variable in your controller action. So I suppose you are trying to do this:

[HttpPost]
public ActionResult Foo(SomeModel model)
{
    model.CurrentStep = Steps.SomeNewValue;
    return View(model);
}

和HTML助手，如HiddenFor总是会首先使用张贴的值，随后将在模型中的价值。

and html helpers such as HiddenFor will always first use the POSTed value and after that the value in the model.

所以，你有几个可能的原因：

So you have a couple of possibilities:

1. 从ModelState中删除值：

1. Remove the value from the modelstate:

[HttpPost]
public ActionResult Foo(SomeModel model)
{
    ModelState.Remove("CurrentStep");            
    model.CurrentStep = Steps.SomeNewValue;
    return View(model);
}

手动生成隐藏字段

Manually generate the hidden field

<input type="hidden" name="NextStep" value="<%= Model.CurrentStep %>" />

写将使用模型的价值，不是被公司发布的一个自定义的帮手

Write a custom helper which will use the value of your model and not the one that's being POSTed

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