一、MVC HtmlHelper拓展示例

添加拓展类文件 public static class Html    {        public static Dictionary
      
        TestExtensionHtml = new Dictionary
       
        ()        {            {
     1,"请选择"},            {
     2,"北京市"},            {
     3,"上海市"}        };        public static MvcHtmlString TestDropDownList(this HtmlHelper html)        {            string result = string.Empty;            StringBuilder sb = new StringBuilder();            sb.AppendLine("
        {1} ", item.Key, item.Value));            }            sb.AppendLine("");            result = sb.ToString();            return new MvcHtmlString(result);        }    }视图引用该命名空间@using Demo.Extensions添加拓展控件@Html.TestTestDropDownList();