ASP.NET MVC 遇到JSON循环调用的问题应该怎么解决?
时间:2017-06-23 15:17
1..Net开源Json序列化工具Newtonsoft.Json中提供了解决序列化的循环引用问题:
方式1:指定Json序列化配置为 ReferenceLoopHandling.Ignore
方式2:指定 JsonIgnore忽略 引用对象
实例1,解决MVC的Json序列化引用方法:
step1:在项目上添加引用 Newtonsoft.Json程序包,命令:Insert-Package Newtonsoft.Json
step2:在项目中添加一个类,继承JsonResult,代码如下:
/// <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()); } } }
step3:在项目添加BaseController,重写Json()方法,代码如下:
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 }; } }
step4.向平时一样使用就可以了
//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//}; }
获取的结果,说明,这种方式指定忽略循环引用,是在指定循环级数后忽略,返回的json数据中还是有部分循环的数据
解决EF Json序列化循环引用方法2,在指定的关联对象上,添加JsonIgnore 方法注释
[JsonIgnore]public virtual ICollection<score> scores { get; set; }
返回结果中,没有关联表数据
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