標籤:json
1..Net開源Json序列化工具Newtonsoft.Json中提供瞭解決序列化的循環引用問題:app
方式1:指定Json序列化配置爲 ReferenceLoopHandling.Ignoreide
方式2:指定 JsonIgnore忽略 引用對象工具
實例1,解決MVC的Json序列化引用方法:oop
step1:在項目上添加引用 Newtonsoft.Json程序包,命令:Insert-Package Newtonsoft.Jsonthis
step2:在項目中添加一個類,繼承JsonResult,代碼以下:spa
/// <summary> /// 繼承JsonResut,重寫序列化方式 /// </summary> public class JsonNetResult : JsonResult { public JsonSerializerSettings Settings { get; private set; } public JsonNetResult() { Settings = new JsonSerializerSettings { //這句是解決問題的關鍵,也就是json.net官方給出的解決配置選項. 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()); } } }
step3:在項目添加BaseController,重寫Json()方法,代碼以下:.net
public class BaseController : Controller { public StudentContext _Context = new StudentContext(); /// <summary> /// 重寫,Json方法,使之返回JsonNetResult類型 /// </summary> protected override JsonResult Json(object data, string contentType, Encoding contentEncoding, JsonRequestBehavior behavior) { return new JsonNetResult { Data = data, ContentType = contentType, ContentEncoding = contentEncoding, JsonRequestBehavior = behavior }; } }
step4.向平時同樣使用就能夠了code
//獲取列表 public JsonResult GetList() { List<student> list = _Context.students.Where(q => q.sno == "103").ToList(); //方法1 return Json(list); //方法2 //return new JsonNetResult() { // Data=list //}; }
獲取的結果,說明,這種方式指定忽略循環引用,是在指定循環級數後忽略,返回的json數據中仍是有部分循環的數據對象
解決EF Json序列化循環引用方法2,在指定的關聯對象上,添加JsonIgnore 方法註釋
[JsonIgnore] public virtual ICollection<score> scores { get; set; }
返回結果中,沒有關聯表數據