JSON 请求太大,无法反序列化

方案一
　　asp.net mvc默认的json序列化ValueProviderFactory使用的是javascriptserializer，可以在配置文件web.config中设置：

<add key="aspnet:MaxJsonDeserializerMembers" value="150000000" />

和

<system.web.extensions>
    <scripting>
        <webServices>
            <jsonSerialization maxJsonLength="2147483644"/>
        </webServices>
    </scripting>
</system.web.extensions>

方案二

　　重写默认的ValueProviderFactory，继承ValueProviderFactory抽象类使用json.net替换javascriptserializer，并且在application_start时将默认的ValueProviderFactory移除，使用自定义的ValueProviderFactory

public sealed class JsonDotNetValueProviderFactory : ValueProviderFactory
    {
       public override IValueProvider GetValueProvider(ControllerContext controllerContext)
       {
            if (controllerContext == null)
                throw new ArgumentNullException("controllerContext");

            if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase))
                return null;

            var reader = new StreamReader(controllerContext.HttpContext.Request.InputStream);
            var bodyText = reader.ReadToEnd();

            return String.IsNullOrEmpty(bodyText) ? null : new DictionaryValueProvider<object>(JsonConvert.DeserializeObject<ExpandoObject>(bodyText, new ExpandoObjectConverter()) , CultureInfo.CurrentCulture);
        }
    }

global.asax

protected void Application_Start()
        {
            log4net.Config.XmlConfigurator.Configure();
            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
            ValueProviderFactories.Factories.Remove(ValueProviderFactories.Factories.OfType<JsonValueProviderFactory>().FirstOrDefault());
            ValueProviderFactories.Factories.Add(new JsonDotNetValueProviderFactory());
            //AutofacBuilder<ModulesRepository>.RegisterPersistent();
        }

网上介绍最多的是第一种方案，但是我觉得json.net比默认的javascriptserializer性能要好所以采用第二种方案！