解决ASP.NET MVC(post数据)Json请求太大,无法反序列化，The JSON request was too large to be deserialized

解决方法：

方案1.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2：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();
        }

建议用第一种方法，第二种方法，会遇到集合参数有时会无法接收的情况。

源文https://www.cnblogs.com/zpc870921/p/4798640.html