错误21找不到类型或命名空间名称'JsonValueProviderFactory'（您是否缺少using指令或程序集引用？） [英] Error 21 The type or namespace name 'JsonValueProviderFactory' could not be found (are you missing a using directive or an assembly reference?)

问题描述

我已经在bin中添加了system.web.mvc引用和system.web.mvc.dll ..但是当我在global.asax中使用以下代码时，它在MVC2中给出了上述错误

 protected void Application_Start（）< br /> 
 {< br /> 
 AreaRegistration.RegisterAllAreas（）;< br /> 
 RegisterRoutes（RouteTable.Routes）;< br /> 
 ValueProviderFactories.Factories.Add（new JsonValueProviderFactory（））;< br /> 
} 
 

Plz帮助我错过了什么???。这个JsonValueProviderFactory（）给出错误

解决方案

请尝试如下。

 受保护  void  Application_Start（）
 {
 AreaRegistration.RegisterAllAreas（）; 
 
 RegisterGlobalFilters（GlobalFilters.Filters）; 
 RegisterRoutes（RouteTable.Routes）; 
 
  //   Remove和JsonValueProviderFactory并添加JsonDotNetValueProviderFactory  
 ValueProviderFactories。 Factories.Remove（ValueProviderFactories.Factories.OfType< JsonValueProviderFactory>（）FirstOrDefault（））; 
 
 ValueProviderFactories.Factories.Add（ new  JsonDotNetValueProviderFactory（））; 
} 

请阅读下面提到的文章以获取有关如何配置的更多详细信息使用Json.Net的JsonValueProviderFactory。



JsonValueProviderFactory使用Json.Net



更新



这是我从项目中提取的样本。请根据您的情况进行更改。



JS

.ajax（{
url：/ PetBooking / GetSelectedCategoryTypeServices，
dataType：'json'，
data：{providerKey：'<％：Model.Provider.Key％ >'，serviceCategoryTypeId：serviceCategoryTypeId}，
success：function（data）{

（ ＃ddlService）fillSelect（数据）。
whenOnlyService（）;

I have already added system.web.mvc reference and system.web.mvc.dll in bin ..But when i am using following code in global.asax it is giving above error in MVC2

protected void Application_Start()<br />
       {<br />
           AreaRegistration.RegisterAllAreas();<br />
           RegisterRoutes(RouteTable.Routes);<br />
           ValueProviderFactories.Factories.Add(new JsonValueProviderFactory());<br />
       }

Plz help what i am missing???.tthis JsonValueProviderFactory() is giving error

解决方案

Please try is as below.

protected void Application_Start()
        {
          AreaRegistration.RegisterAllAreas();

          RegisterGlobalFilters(GlobalFilters.Filters);
          RegisterRoutes(RouteTable.Routes);

         //Remove and JsonValueProviderFactory and add JsonDotNetValueProviderFactory
            ValueProviderFactories.Factories.Remove(ValueProviderFactories.Factories.OfType<JsonValueProviderFactory>().FirstOrDefault());

      ValueProviderFactories.Factories.Add(new JsonDotNetValueProviderFactory());
        }

Please read the below mentioned article to get more details about how to configure JsonValueProviderFactory using Json.Net.

JsonValueProviderFactory using Json.Net

UPDATE

This is a sample which I extracted from my project.Please change it according to your situation.

JS

.ajax({ url: "/PetBooking/GetSelectedCategoryTypeServices", dataType: 'json', data: { providerKey: '<%:Model.Provider.Key%>', serviceCategoryTypeId: serviceCategoryTypeId }, success: function (data) {

("#ddlService").fillSelect(data); whenOnlyService();

这篇关于错误21找不到类型或命名空间名称'JsonValueProviderFactory'（您是否缺少using指令或程序集引用？）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！