WEB API JSON序列化循环引用 [英] WEB API JSON Serializing Circular References

问题描述

我正在尝试从Web API接收的子实体访问属性字段（JSON）。但是，通过查看浏览器控制台，它显示的是引用而不是字段。如何访问这些字段？

ANGULAR JS VIEW

 < table infinite-scroll ='tF.loadMore（）'infinite-scroll-disabled ='tF.isBusy'infinite-scroll-distance ='3'class =responsive> 
< thead> 
< tr> 
< th> FIELD 1< 
< th> FIELD 2< 
< th> FIELD 3< 
< th> FIELD 4< 
<< th> FIELD 5< 
< / tr> 
< / thead> 
< tbody> 
< tr ng-repeat =tF.items中的项目| filter：searchFilter> 
< td> {{item.CompanyDomainModel.CompanyName}}< / td> 
< td> {{item.RatingDomainModel.RatingValue}}< / td> 
< td> {{item.Views}}< / td> 
< td> {{item.Clicks}}< / td> 
< td> {{item.EmailSent}}< / td> 
< / tr> 
< / tbody> 
< tfoot ng-show ='tF.isBusy'> 
< tr> 
< td colspan =9>< spinner show =tF.isBusy/>< span class =bold> {{tF.status}}< / span> < / TD> 
< / tr> 
< / tfoot> 
< / table> 
  

SERVICE

  public ICollection< CompanyStatDomainModel> GetRecordsByPageSize（int page）{
 const int pgeSize = 20; 
 var result = _companyStatRepo 
 .AllIncluding（c => c.CompanyDomainModel，c => c.RatingDomainModel）
 .OrderBy（c => c.CompanyStatId）
 .Skip（page * pgeSize）
 .Take（pgeSize）
 .ToList（）; 
返回结果; 
} 
  

ENDPOINT

  IHttpActionResult GetRecordsByPageSize（int page）{
 var companyStatService = new CompanyStatService（）; 
 return Ok（companyStatService.GetRecordsByPageSize（page））; 
} 
  

评分域模型

  public class RatingDomainModel：IObjectWithState 
 {
 [Key，DatabaseGenerated（DatabaseGeneratedOption.Identity）] 
 [DataMember] 
 public int RatingId {get;组; } 
 
 [DataMember] 
 public int CompanyId {get;组; } 
 
 [DataMember] 
 public int UserId {get;组; } 
 
 [DataMember] 
 public int RatingValue {get;组; } 
 
 [DataMember] 
 public DateTime CreatedDate {get;组; } 
 
 // [ForeignKey（UserId）] 
 [DataMember] 
 public virtual UserDomainModel UserDomainModel {get;组; } 
 
 // [ForeignKey（CompanyId）] 
 [DataMember] 
 public virtual CompanyDomainModel CompanyDomainModel {get;组; } 
 
 [DataMember] 
 public virtual ICollection< CompanyStatDomainModel> CompanyStatDomainModels {get;组; 
 
 [NotMapped] 
 public Common.DataObject.State state {get;组; } 
 
 [NotMapped] 
 public bool InDb 
 {
 get {return this.RatingId！= default（int）; } 
} 
 
 public object PersistenceEntityId 
 {
 get {return this.RatingId; 
} 
} 
  

OUTPUT p>

解决方案

将以下代码添加到WebApiConfig.cs中

  config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore; 
 config.Formatters.JsonFormatter.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.None; 
  

I'm trying to access the property fields (JSON) from the child entity that is received from Web API. By looking at the browser console, however, it is showing a reference instead of the fields. How do I get access to these fields?

ANGULAR JS VIEW

 <table infinite-scroll='tF.loadMore()' infinite-scroll-disabled='tF.isBusy' infinite-scroll-distance='3' class="responsive">
            <thead>
                <tr>
                    <th>FIELD 1</th>
                    <th>FIELD 2</th>
                    <th>FIELD 3</th>
                    <th>FIELD 4</th>
                    <th>FIELD 5</th>
                </tr>
            </thead>
            <tbody>
                <tr ng-repeat="item in tF.items | filter:searchFilter">
                    <td>{{item.CompanyDomainModel.CompanyName}}</td>
                    <td>{{item.RatingDomainModel.RatingValue}}</td>
                    <td>{{item.Views}}</td>
                    <td>{{item.Clicks}}</td>
                    <td>{{item.EmailSent}}</td>
                </tr>
            </tbody>
            <tfoot ng-show='tF.isBusy'>
                <tr>
                    <td colspan="9"><spinner show="tF.isBusy" /><span class="bold">{{tF.status}}</span> </td>
                </tr>
            </tfoot>
        </table>

SERVICE

public ICollection<CompanyStatDomainModel> GetRecordsByPageSize(int page) { 
  const int pgeSize = 20; 
  var result = _companyStatRepo
    .AllIncluding(c => c.CompanyDomainModel, c => c.RatingDomainModel) 
    .OrderBy(c => c.CompanyStatId)
    .Skip(page * pgeSize)
    .Take(pgeSize)
    .ToList(); 
  return result; 
} 

ENDPOINT

IHttpActionResult GetRecordsByPageSize(int page) { 
  var companyStatService = new CompanyStatService(); 
  return Ok(companyStatService.GetRecordsByPageSize(page)); 
} 

RATING DOMAIN MODEL

 public class RatingDomainModel : IObjectWithState
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [DataMember]
    public int RatingId { get; set; }

    [DataMember]
    public int CompanyId { get; set; }

    [DataMember]
    public int UserId { get; set; }

    [DataMember]
    public int RatingValue { get; set; }

    [DataMember]
    public DateTime CreatedDate { get; set; }

    //[ForeignKey("UserId")]
    [DataMember]
    public virtual UserDomainModel UserDomainModel { get; set; }

    //[ForeignKey("CompanyId")]
    [DataMember]
    public virtual CompanyDomainModel CompanyDomainModel { get; set; }

    [DataMember]
    public virtual ICollection<CompanyStatDomainModel> CompanyStatDomainModels { get; set; }

    [NotMapped]
    public Common.DataObject.State state { get; set; }

    [NotMapped]
    public bool InDb
    {
        get { return this.RatingId != default(int); }
    }

    public object PersistenceEntityId
    {
        get { return this.RatingId; }
    }
}

OUTPUT

解决方案

Added the below code into WebApiConfig.cs

config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling =    Newtonsoft.Json.ReferenceLoopHandling.Ignore;
config.Formatters.JsonFormatter.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.None;

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