这个问题出现的场景并不是很多,当你向服务端异步(ajax)post数据非常大的情况下(比如做权限管理的时候给某个角色分配权限那么就可能会出现,我所遇到的就是该角色大概200个模块每个模块平均2个功能----那么发送到服务端action的将是一个有着400个对象的数组)
之前我们向服务端异步post数组可能需要使用
1 $.ajax({
2 type: 'POST',
3 url: '/system/SaveRoleReModule',
4 dataType: "json",
5 contentType: "application/json;charset=utf-8",
6 data: JSON.stringify({ tree: treearr, roleId: roleid }),
7 success: function (d) {
8 if (d > 0) {
9 $.popAlter({ content: '操作成功!', hideOkBtn:true,btnTxt:'确定'});
10 // kq_show_info('系统提示', '操作成功', 2000);
11 }
12 },
13 error: function (e) {
14 //kq_show_info('系统提示', e.responseText, 2000);
15 }
16 });
但是当我们把javascriptserializer换成json.net之后以上方式将可以简化为以下写法:
1 $.ajax({
2 type:'post',
3 url:'',
4 data:{o:arr}
5 success:function(d){},
6 error:function(e){}
7 })
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
1 public sealed class JsonDotNetValueProviderFactory : ValueProviderFactory
2 {
3 public override IValueProvider GetValueProvider(ControllerContext controllerContext)
4 {
5 if (controllerContext == null)
6 throw new ArgumentNullException("controllerContext");
7
8 if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase))
9 return null;
10
11 var reader = new StreamReader(controllerContext.HttpContext.Request.InputStream);
12 var bodyText = reader.ReadToEnd();
13
14 return String.IsNullOrEmpty(bodyText) ? null : new DictionaryValueProvider<object>(JsonConvert.DeserializeObject<ExpandoObject>(bodyText, new ExpandoObjectConverter()) , CultureInfo.CurrentCulture);
15 }
16 }
global.asax
1 protected void Application_Start()
2 {
3 log4net.Config.XmlConfigurator.Configure();
4 AreaRegistration.RegisterAllAreas();
5 GlobalConfiguration.Configure(WebApiConfig.Register);
6 FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
7 RouteConfig.RegisterRoutes(RouteTable.Routes);
8 BundleConfig.RegisterBundles(BundleTable.Bundles);
9 ValueProviderFactories.Factories.Remove(ValueProviderFactories.Factories.OfType<JsonValueProviderFactory>().FirstOrDefault());
10 ValueProviderFactories.Factories.Add(new JsonDotNetValueProviderFactory());
11 //AutofacBuilder<ModulesRepository>.RegisterPersistent();
12 }