关于返回MvcHtmlString问题？？

Question

报这个错，在razor里调不到这个方法？？？

•  “System.Web.Mvc.HtmlHelper<dynamic>”不包含“ReplaceStr”的定义，并且找不到可接受类型为“System.Web.Mvc.HtmlHelper<dynamic>”的第一个参数的扩展方法“ReplaceStr”(是否缺少 using 指令或程序集引用?)"

}

这里是razor视图

这个是扩展方法

Answer 1

注意，你的应该是HtmlHelper类扩展：

public static MvcHtmlString ReplaceStr(this System.Web.Mvc.HtmlHelper<dynamic> helper,string str)
{
  ………………
}

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Answer 2

改了还是不行，能写的详细点么？

Answer 3

删除命名空间，重新创建一个新的cs类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Html;
 
    public static class MyMVCExtendedClass
    {
        public static MvcHtmlString ReplaceStr(this System.Web.Mvc.HtmlHelper<dynamic> helper,string str)
        {
            return MvcHtmlString.Create(str);
        }
    }

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Answer 4

在razor页面要使用扩展 必须定义成

this.HtmlHelper

而不是

this mvchtmlstring

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Answer 5

扩展方法按您改的可以了，但是Razor这里是wd.BankAccount 就调不到方法， 换成字符串比如 "你好" 就可以。

Answer 6

什么叫“调用不到方法”，你断点调试看看（针对这个方法下断点），看看传来的数据究竟怎么回事。

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