这是什么Html.HiddenFor办？ [英] What does Html.HiddenFor do?

问题描述

虽然我已阅读Html.HiddenFor的文件，我还没有掌握它是干什么用的？

Although I have read the documentation on Html.HiddenFor, I've not grasped what is it used for...

有人能解释其用途并给出一个简短的例子？

Could somebody explain its uses and give a short example?

应该在哪里这些佣工在code去了？

Where should those helpers go in the code?

推荐答案

创建表单字段上的一个隐藏的输入（从你的模型），你传递给它。

Creates a hidden input on the form for the field (from your model) that you pass it.

它，你需要坚持在页面上，并传回时，由另一个呼叫，但不应该在你的模型/视图模型领域是非常有用的修改<击>用户看到的。

It is useful for fields in your Model/ViewModel that you need to persist on the page and have passed back when another call is made but shouldn't be modified seen by the user.

考虑下面ViewModel类：

Consider the following ViewModel class:

public class ViewModel
{
    public string Value { get; set; }
    public int Id { get; set; }
}

现在你要编辑页面存储ID但它不会是<打击>编辑<​​/击>看到：

Now you want the edit page to store the ID but have it not be editable seen:

<% using(Html.BeginForm() { %>
    <%= Html.HiddenFor(model.Id) %><br />
    <%= Html.TextBoxFor(model.Value) %>
<% } %>

这导致以下HTML的当量：

Which results in the equivalent of the following HTML:

<form name="form1">
    <input type="hidden" name="Id">2</input>
    <input type="text" name="Value" value="Some Text" />
</form>

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