public class JsonAttribute : ActionFilterAttribute     {        /// 
        /// 兼容IE下无法接受JSON问题        /// 
        ///         public override void OnResultExecuted(ResultExecutedContext filterContext)        {            string contentType = filterContext.HttpContext.Response.ContentType;            if (contentType == "application/json")                filterContext.HttpContext.Response.ContentType = "text/html";            base.OnResultExecuted(filterContext);        }    }

写一个过滤器，ContentType修改为"text/html"，类名要以Attribute结尾

在Global.asax文件中注册过滤器

public static void RegisterGlobalFilters(GlobalFilterCollection filters)        {
                filters.Add(new JsonAttribute());            filters.Add(new HandleErrorAttribute());        }