ASP .NET MVC - Json 的循环回路

 

要解决 Json 的循环回路, 需要先新建一个类

需要先引用 using Newtonsoft.Json;

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());
            }
        }
    }

 

再写个 BaseController 基类方法  继承 Controller

重写 Json 方法

    public class BaseController : Controller
    {/// <summary>
        ///  重写 Json 方法
        ///  避免出现循环引用
        /// </summary>
        /// <param name="data"></param>
        /// <param name="contentType"></param>
        /// <param name="contentEncoding"></param>
        /// <param name="behavior"></param>
        /// <returns></returns>
        protected override JsonResult Json(object data, string contentType, Encoding contentEncoding, JsonRequestBehavior behavior)
        {
            return new JsonNetResult
            {
                Data = data,
                ContentType = contentType,
                ContentEncoding = contentEncoding,
                JsonRequestBehavior = behavior
            };
        }
    }