什么是MVC3使用Html.BeginForm的 [英] What is the use of Html.BeginForm in MVC3

问题描述

什么是MVC3使用Html.BeginForm的。
我们为什么要使用它，我们可以只直接添加一个表单标签，这是否HTML辅助添加一些功能或做一些事情，不能用一个简单的表单标签来完成。

What is the use of Html.BeginForm in MVC3. Why do we use it, when we can just add a form tag directly, does this html helper add some capability or does something which cannot be done with a simple form tag.

推荐答案

的 Html.BeginForm 辅助方法，包含一个<一个href=\"http://msdn.microsoft.com/en-us/library/system.web.mvc.html.formextensions.beginform.aspx\">couple重载的预期，其目的是为了使写作路由形式更容易。它知道MVC stucture，并确保其定位控制器和动作。这只是一个有点语法糖过来：

The Html.BeginForm helper method contains a couple overloads whose intended purpose is to make writing routed forms easier. It is aware of MVC stucture and makes sure its targeting a controller and action. It's just a bit of syntactic sugar over:

<form method="post" action="@Url.Action(...)">

在微软的话说：

ASP.NET MVC框架包括辅助方法提供了一种方便的方法来呈现HTML视图中。

The ASP.NET MVC framework includes helper methods that provide an easy way to render HTML in a view.

当然，没有人让你使用它们。它只是preference的问题。事实上，在MVC的初期，许多的WebForms开发商庆祝从服务器的新的自由控制一拉＆LT; ASP：文本框＆GT; 等，并在写作坚持用手一切。

Of course, no one is making you use them. Its just a matter of preference. In fact, in the early days of MVC, many WebForms developers celebrated their new freedom from server controls a-la <asp:TextBox> et al., and insisted on writing everything by hand.

值得推荐，因为他们是知道的东西像表单验证。 Html.BeginForm 只是给你一个一致的方式来启动和完成表单：

Using the helpers for your form fields comes highly recommended, since they're aware of things like form validation. Html.BeginForm just gives you a consistent way to start and finish your form:

@using(Html.BeginForm())
{
    @Html.LabelFor(...)
    @Html.EditorFor(...)
}

Html.BeginForm 返回的IDisposable 的对象，让你敷在C＃使用语句。当使用退出，处置将调用 Html.EndForm（）自动为您。由于 Html.EndForm 收益无效是稍显不便，从剃刀拨打：

Html.BeginForm returns an IDisposable object, allowing you to wrap it in the C# using statement. When the using exits, the disposal will call Html.EndForm() automatically for you. Since Html.EndForm returns void it is slightly inconvenient to call from Razor:

@Html.BeginForm()
<formStuff>
@{Html.EndForm();}

一个简单的 @ Html.EndForm（）将变成写（Html.EndForm（）） - GT;写（无效），即编译时错误。

A simple @Html.EndForm() will turn in to Write(Html.EndForm()) -> Write(void), ie compile time error.

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