1..Net開源Json序列化工具Newtonsoft.Json中提供瞭解決序列化的循環參考問題:
方式1:指定Json序列化配置為 ReferenceLoopHandling.Ignore
方式2:指定 JsonIgnore忽略 引用對象
執行個體1,解決MVC的Json序列化引用方法:
step1:在項目上添加引用 Newtonsoft.Json程式包,命令:Insert-Package Newtonsoft.Json
step2:在項目中添加一個類,繼承JsonResult,代碼如下:
/// <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,代碼如下:
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.向平時一樣使用就可以了
//擷取列表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//};}
擷取的結果,說明,這種方式指定忽略循環參考,是在指定迴圈級數後忽略,返回的json資料中還是有部分迴圈的資料
解決EF Json序列化循環參考方法2,在指定的關聯對象上,添加JsonIgnore 方法注釋
[JsonIgnore]public virtual ICollection<score> scores { get; set; }
返回結果中,沒有關聯表資料
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