/// <summary>
/// 继承JsonResut，重写序列化方式
/// </summary>
public class JsonNetResult : JsonResult
{public JsonSerializerSettings Settings { get; private set; }public JsonNetResult(){Settings = new JsonSerializerSettings{//这句是解决问题的关键,也就是json.net官方给出的解决配置选项.                 ReferenceLoopHandling = ReferenceLoopHandling.Ignore};}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);using (var sw = new StringWriter()){scriptSerializer.Serialize(sw, this.Data);response.Write(sw.ToString());}}
}

public class BaseController : Controller
{public StudentContext _Context = new StudentContext();/// <summary>/// 重写，Json方法，使之返回JsonNetResult类型/// </summary>protected override JsonResult Json(object data, string contentType,Encoding contentEncoding, JsonRequestBehavior behavior){return new JsonNetResult{Data = data,ContentType = contentType,ContentEncoding = contentEncoding,JsonRequestBehavior = behavior};}
}

//获取列表
public JsonResult GetList()
{List<student> list = _Context.students.Where(q => q.sno == "103").ToList();//方法1return Json(list);//方法2//return new JsonNetResult() {//    Data=list//};
}