Self referencing loop detected for property异常

When classes call each other, for example: there are two classes A and B, A contains B, and B also contains A, it is easy to cause a circular reference exception during class serialization.

This is more common in relational mapping

Solution:

 public class PersonRole
    {
        public String PersonId { get; set; }
        public String RoleId { get; set; }

        /// <summary>
        /// using Newtonsoft.Json;
        ///   [JsonIgnore]作用是取消属性的序列化，避免循环引用的的异常
        /// </summary>
        [JsonIgnore]
        public virtual Person GetPeople { get; set; }
        [JsonIgnore]
        public virtual Role GetRoles { get; set; }
    }

I solved it using the [JsonIgnore] annotation, which is at the Property level. Note that the reference to the namespace where it is located is

using Newtonsoft.Json;

 public class Role
    {
        [BindNever]
        [Key]
        public string RoleId { get; set; }
        [Required(ErrorMessage = "角色名不能为空")]
        public string RoleName { get; set; }
        /*Timestamp时间戳，用于实现乐观并发，数据库自动生成无需赋值
        [Timestamp]
        public byte[] RowVersion { get; set; }
        */
        #region 多对多导航
        //多的一端
        /// <summary>
        /// 人员角色表，对人员角色来说，角色是多
        /// </summary>
        public virtual ICollection<PersonRole> PersonRoles { get; set; }
        #endregion
    }

public class Person
    {
        //[ScaffoldColumn(false)]
        //数据验证
        [BindNever] //解除模型绑定，防止传递来的模型数据修改此值
        [Key]
        public String Id { get; set; }
/*其他代码*/

        public virtual ICollection<PersonRole> PersonRoles { get; set; }

    }

Results of the:

<form id="form_@i" method="post" asp-area="Admin">
      <input type="text" name="PersonId" value="@Model[i].PersonId" />
      <input type="text" name="PersonName" value="@Model[i].GetPeople.Name" />
      <input type="text" name="RoleId" value="@Model[i].RoleId" />
      <input type="text" name="RoleName" value="@Model[i].GetRoles.RoleName" />
      
      <button type="button" onclick="">删除</button>
      <button type="button" onclick="">更新</button>
</form>

It is worth noting that the [JsonIgnore] annotation only needs to be written in one paragraph, either in the main body or in the sub-body. Just write [JsonIgnore] in A or B.

Self referencing loop detected for property异常

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