.net Html.HiddenFor 有什么作用？
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What does Html.HiddenFor do?
提问by JPCF
Although I have read the documentation on Html.HiddenFor, I've not grasped what is it used for...
虽然我已经阅读了 Html.HiddenFor 的文档，但我还没有掌握它的用途......
Could somebody explain its uses and give a short example?
有人可以解释它的用途并举一个简短的例子吗？
Where should those helpers go in the code?
这些助手应该放在代码中的什么位置？
回答by Justin Niessner
It creates a hidden input on the form for the field (from your model) that you pass it.
它在表单上为您传递的字段（来自您的模型）创建一个隐藏输入。
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 seen by the user.
对于模型/视图模型中的字段很有用，这些字段需要保留在页面上，并在进行另一个调用时传回，但不应被用户看到。
Consider the following ViewModel class:
考虑以下 ViewModel 类：
public class ViewModel
{
public string Value { get; set; }
public int Id { get; set; }
}
Now you want the edit page to store the ID but have it not be seen:
现在您希望编辑页面存储 ID 但不显示它：
<% using(Html.BeginForm() { %>
<%= Html.HiddenFor(model.Id) %><br />
<%= Html.TextBoxFor(model.Value) %>
<% } %>
This results in the equivalent of the following HTML:
这将导致等效于以下 HTML：
<form name="form1">
<input type="hidden" name="Id">2</input>
<input type="text" name="Value" value="Some Text" />
</form>
回答by James Still
And to consume the hidden ID input back on your Edit action method:
并在您的 Edit 操作方法中使用隐藏的 ID 输入：
[HttpPost]
public ActionResult Edit(FormCollection collection)
{
ViewModel.ID = Convert.ToInt32(collection["ID"]);
}
回答by Devin Andres Salemi
Like a lot of functions, this one can be used in many different ways to solve many different problems, I think of it as yet another tool in our toolbelts.
像许多函数一样，这个函数可以以多种不同的方式使用来解决许多不同的问题，我认为它是我们工具带中的另一个工具。
So far, the discussion has focused heavily on simply hiding an ID, but that is only one value, why not use it for lots of values! That is what I am doing, I use it to load up the values in a class only one view at a time, because html.beginform creates a new object and if your model object for that view already had some values passed to it, those values will be lost unless you provide a reference to those values in the beginform.
到目前为止，讨论主要集中在简单地隐藏一个 ID，但这只是一个值，为什么不将它用于很多值！这就是我正在做的事情，我使用它一次只加载一个视图中的值，因为 html.beginform 创建了一个新对象，如果该视图的模型对象已经有一些值传递给它，那些除非您在 beginform 中提供对这些值的引用，否则这些值将丢失。
To see a great motivation for the html.hiddenfor, I recommend you see Passing data from a View to a Controller in .NET MVC - "@model" not highlighting
要查看 html.hiddenfor 的强大动机，我建议您查看将数据从视图传递到 .NET MVC 中的控制器 - “@model”不突出显示
回答by Abi
The Use of Razor code @Html.Hidden or @Html.HiddenFor is similar to the following Html code
Razor代码@Html.Hidden或@Html.HiddenFor的使用类似于下面的Html代码
<input type="hidden"/>
And also refer the following link
并参考以下链接
