Html.BeginForm 与Section、Partial View 和 Child Action

该方法用于构建一个From表单的开始，他的构造方法为：
Html.BeginForm（"ActionName","ControllerName",FormMethod.method）

例如：

 @using (Html.BeginForm("Index", "Home", FormMethod.Get, new { name = "nbform", id = "nbform" }))

@using(@Html.BeginForm("ImportStu", "ProSchool", FormMethod.Post, new { enctype = "multipart/form-data" }))
     {
        <text>选择上传文件：（工作表名为“Sheet1”，“电脑号”在A1单元格。）</text>
        <input name="file" type="file" id="file" />
        <input type="submit" name="Upload" value="批量导入第一批电脑派位名册" />
    }

让请求地址不带id

@using (Html.BeginForm("AddDIYBillOfLading", "BillOfLading", new { id ="" }, FormMethod.Post, new { name = "myform", id = "myform" }))

Section、Partial View 和 Child Action 参考：http://www.cnblogs.com/willick/p/3410855.html

右击Index方法，添加视图，编辑该视图如下：

@model string[] 
 
@{ 
    ViewBag.Title = "Index"; 
} 
 
@section Header { 
    <div class="view"> 
        @foreach (string str in new [] {"Home", "List", "Edit"}) { 
            @Html.ActionLink(str, str, null, new { style = "margin: 5px" })   
        } 
    </div> 
}

<div class="view"> 
    This is a list of fruit names: 
    @foreach (string name in Model) { 
        <span><b>@name</b></span> 
    } 
</div>

@section Footer { 
    <div class="view"> 
        This is the footer 
    </div> 
}

编辑 /Views/Shared/_Layout.cshtml 文件如下：

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="utf-8" /> 
    <meta name="viewport" content="width=device-width" /> 
    <style type="text/css"> 
        div.layout { background-color: lightgray;} 
        div.view { border: thin solid black; margin: 10px 0;} 
    </style> 
    <title>@ViewBag.Title</title> 
</head> 
<body>
    @RenderSection("Header") 
 
    <div class="layout"> 
        This is part of the layout 
    </div> 
 
    @RenderBody() 
 
    <div class="layout"> 
        This is part of the layout 
    </div>

    @RenderSection("Footer")
<div class="layout"> 
        This is part of the layout 
    </div> 
</body> 
</html>

section只能在当前View或它的Layout中被调用。@RenderSection方法没有找到参数指定的section会抛异常，如果不确定section是否存在，则需要指定第二个参数的值为false，如下：

... 
@RenderSection("scripts", false) 
...

我们还可以通过 IsSectionDefined 方法来判断一个section是否被定义或在当前View中是否能调用得到，如：

... 
@if (IsSectionDefined("Footer")) { 
    @RenderSection("Footer") 
} else { 
    <h4>This is the default footer</h4>    
} 
...