1、在Application_Start第一行加

GlobalFilters.Filters.Add(new JsonNetActionFilter());

2、JsonNetActionFilter

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace Test.App_Start{ public class JsonNetActionFilter : IActionFilter { public void OnActionExecuted(ActionExecutedContext filterContext) { if (filterContext.Result is JsonResult && !(filterContext.Result is JsonNetResult)) { JsonResult jsonResult = (JsonResult)filterContext.Result; JsonNetResult jsonNetResult = new JsonNetResult(); jsonNetResult.ContentEncoding = jsonResult.ContentEncoding; jsonNetResult.ContentType = jsonResult.ContentType; jsonNetResult.Data = jsonResult.Data; jsonNetResult.JsonRequestBehavior = jsonResult.JsonRequestBehavior; jsonNetResult.MaxJsonLength = jsonResult.MaxJsonLength; jsonNetResult.RecursionLimit = jsonResult.RecursionLimit; filterContext.Result = jsonNetResult; } } public void OnActionExecuting(ActionExecutingContext filterContext) { } }}

3、JsonNetResult

using Newtonsoft.Json;using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;namespace Test.App_Start{ public class JsonNetResult : JsonResult { public JsonNetResult() { Settings = new JsonSerializerSettings { //忽略循环引用，如果设置为Error，则遇到循环引用的时候报错（建议设置为Error，这样更规范） ReferenceLoopHandling = ReferenceLoopHandling.Ignore, DateFormatString = "yyyy-MM-dd HH:mm:ss",//日期格式化，默认的格式也不好看 ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver() //json中属性开头字母小写的驼峰命名 }; } public JsonSerializerSettings Settings { get; private set; } public override void ExecuteResult(ControllerContext context) { if (context == null) throw new ArgumentNullException("context"); if (this.JsonRequestBehavior == JsonRequestBehavior.DenyGet && string.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase)) throw new InvalidOperationException("JSON GET is not allowed"); HttpResponseBase response = context.HttpContext.Response; response.ContentType = string.IsNullOrEmpty(this.ContentType) ? "application/json" : this.ContentType; if (this.ContentEncoding != null) response.ContentEncoding = this.ContentEncoding; if (this.Data == null) return; var scriptSerializer = JsonSerializer.Create(this.Settings); scriptSerializer.Serialize(response.Output, this.Data); } }}