mvc4扩展方法

制作扩展方法，方便网页中使用，下面做了两个例子

using System;

using System.Collections.Generic;

using System.Linq;

using System.Linq.Expressions;

using System.Text;

using System.Web;

namespace System.Web.Mvc

{

    public static class CheckBoxListHelper

    {

        public static MvcHtmlString CheckBoxList(this HtmlHelper helper, string[] showStr,string attrName, bool isHorizon = true)

        {

            if (showStr == null)

                return null;

            if (attrName == null)

            {

                attrName = "temp";

            }

            StringBuilder sb = new StringBuilder();

            int i=;

            foreach (var item in showStr)

            {

                i++;

                sb.Append("<label class='checkbox-inline'>");

                sb.Append(string.Format("<input type='checkbox' id='{0}' name='{0}' value='{1}'>{1}</input>", attrName + i, item));

                sb.Append("</label>");

            }

            return new MvcHtmlString(sb.ToString());

        }

        /// <summary>

        /// 截取字符长度

        /// </summary>

        /// <param name="helper"></param>

        /// <param name="showStr"></param>

        /// <param name="attrName"></param>

        /// <param name="isHorizon"></param>

        /// <returns></returns>

        public static MvcHtmlString GetStringSub(this HtmlHelper helper, string s, int len)

        {

            if (string.IsNullOrEmpty(s))

                return new MvcHtmlString("");

            if (s.Length <= len)

                return new MvcHtmlString(s.ToString());

            else

            {

                return new MvcHtmlString("<span title='" + s + "'>" + s.Substring(, len) + ".</span>");

            }

        }

    }

}