eg3：扩展HtmlHelper
                
                扩展方法类
              

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 1              public static class HtmlExtension
 2                 {
 3                     /// <summary>
 4                     /// 输出表单提交按钮
 5                     /// </summary>
 6                     /// <param name="htmlHelper">HtmlHelper对象</param>
 7                     /// <param name="name"></param>
 8                     /// <param name="value"></param>
 9                     /// <returns></returns>
10                     public static MvcHtmlString Submit(this HtmlHelper htmlHelper,string name,string value)
11                     {
12                         //TagBuilder 用于辅助创建标记
13                         var builder = new TagBuilder("input");
14                         builder.MergeAttribute("type","submit");
15                         //设置value属性
16                         builder.MergeAttribute("value",value);  
17                         //设置name属性
18                         builder.MergeAttribute("name",name);
19                         //设置id属性
20                         builder.GenerateId(name);
21                         return MvcHtmlString.Create(builder.ToString());
22                     }
23 
24                     public static MvcHtmlString Submit(this HtmlHelper htmlHelper, string name, string value, object htmlAttributes)
25                     {
26                         //TagBuilder 用于辅助创建标记
27                         var builder = new TagBuilder("input");
28                         builder.MergeAttribute("type", "submit");
29                         //设置value属性
30                         builder.MergeAttribute("value", value);
31                         //设置name属性
32                         builder.MergeAttribute("name", name);
33                         //设置id属性
34                         builder.GenerateId(name);
35                         //设置其他属性
36                         builder.MergeAttributes(new RouteValueDictionary(htmlAttributes));
37                         return MvcHtmlString.Create(builder.ToString());
38                     }
39                 }
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                //页面中进行使用
               

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 1             @{
 2                     Layout = null;
 3                 }
 4                 @using ExtensionMethods.App_Code;
 5 
 6                 <!DOCTYPE html>
 7 
 8                 <html>
 9                 <head>
10                     <meta name="viewport" content="width=device-width" />
11                     <title>Index</title>
12                 </head>
13                 <body>
14                     <div>
15                         @Html.Submit("login","登录")
16 
17                         @Html.Submit("login", "登录", new { @class="opt_sub",title="点击提交"})
18                     </div>
19                 </body>
20                 </html>
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