/// 
/// 繼承JsonResut，重寫(xiě)序列化方式/// 
public class JsonNetResult : JsonResult
{public JsonSerializerSettings Settings { get; private set; }public JsonNetResult()
    {
        Settings = new JsonSerializerSettings
        {//這句是解決問(wèn)題的關(guān)鍵,也就是json.net官方給出的解決配置選項(xiàng).                 
            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();/// 
/// 重寫(xiě)，Json方法，使之返回JsonNetResult類型/// 
protected override JsonResult Json(object data, string contentType,
        Encoding contentEncoding, JsonRequestBehavior behavior)
    {return new JsonNetResult
        {
            Data = data,
            ContentType = contentType,
            ContentEncoding = contentEncoding,
            JsonRequestBehavior = behavior
        };
    }
}

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