System.InvalidOperationException：检测到循环引用 [英] System.InvalidOperationException: A circular reference was detected

问题描述

System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: A circular reference was detected while serializing an object of type projectnetwork.Models.Branch.
   at System.Xml.Serialization.XmlSerializationWriter.WriteStartElement(String name, String ns, Object o, Boolean writePrefixed, XmlSerializerNamespaces xmlns)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write7_Branch(String n, String ns, Branch o, Boolean isNullable, Boolean needType)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write6_Company(String n, String ns, Company o, Boolean isNullable, Boolean needType)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write7_Branch(String n, String ns, Branch o, Boolean isNullable, Boolean needType)
   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write8_Branch(Object o)
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)
   --- End of inner exception stack trace ---
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)
   at System.Xml.Serialization.XmlSerializer.Serialize(TextWriter textWriter, Object o, XmlSerializerNamespaces namespaces)
   at System.Web.Services.Protocols.XmlReturnWriter.Write(HttpResponse response, Stream outputStream, Object returnValue)
   at System.Web.Services.Protocols.WebServiceHandler.WriteReturns(Object[] returnValues)
   at System.Web.Services.Protocols.WebServiceHandler.Invoke()

几个小时前，到目前为止，我无法解决这个问题我真的很累，在我疯了之前的最后机会：)我可以找到解决这个问题的人吗？
我想做的是返回类型为branch的对象，该对象是孩子的包括其父公司Company的对象。

A few hours ago and so far I could not solve this problemو I am really tired and for the last chance before I became a crazy :) can I find someone who solved this problem ? what I'm trying to do is return object of type branch which is the child include the object of his parent which is Company.

• 分支类

• Branch class

public partial class Branch
{
    public Branch()
    {
        this.Customers = new List<Customer>();
    }

        public int BranchID { get; set; }
        public int CompanyID { get; set; }
        public string BranchName { get; set; }
        public string BranchShortName { get; set; }
        public string BranchAddress { get; set; }
        public string BranchPhone { get; set; }
        public string BranchEmail { get; set; }
        public string BranchFax { get; set; }
        public Nullable<float> BranchLimit { get; set; }
        public bool RecordState { get; set; }
        public virtual Company Company { get; set; }        
    }

公司类别

Company class

public partial class Company
{
    public Company()
    {
        this.Branches = new List<Branch>();
    }

    public int CompanyID { get; set; }
    public string CompanyName { get; set; }
    public string CompanyShortName { get; set; }
    public string CompanyAddress { get; set; }
    public string CompanyPhone { get; set; }
    public string CompanyEmail { get; set; }
    public string CompanyFax { get; set; }
    public bool RecordState { get; set; }
    public virtual List<Branch> Branches { get; set; }
}

NewDBContext类

NewDBContext class

using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using projectnetwork.Models.Mapping;

namespace projectnetwork.Models
{
public partial class NewDBContext : DbContext
{
    static NewDBContext()
    {
        Database.SetInitializer<NewDBContext>(null);
    }

    public NewDBContext()
        : base("Name=NewDBContext")
    {
        this.Configuration.LazyLoadingEnabled   = false;
        this.Configuration.ProxyCreationEnabled = false;
    }

    public DbSet<Branch> Branches { get; set; }
    public DbSet<Company> Companies { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new BranchMap());
        modelBuilder.Configurations.Add(new CompanyMap());          
    }
}
}

调用方法

Call Method

    [WebMethod]
    public Branch getAllCustomers()
    {
        Branch  br = null;

        using (var db = new NewDBContext())
        {
            br = db.Branches
                .Where(d => d.CompanyID == 1)
                .Include(c => c.Company)
                .FirstOrDefault<Branch>();                  


            return br;

        }

对不起，我的英语不好

推荐答案

您可以尝试添加 JsonIgnore 属性如果您使用的是Newtonsoft.Json，则在类上停止渲染它。

You can try adding a JsonIgnore attribute on your class to stop it being rendered, if you are using Newtonsoft.Json

public partial class Company
{
    public Company()
    {
        this.Branches = new List<Branch>();
    }

    ....

    [JsonIgnore]
    public virtual List<Branch> Branches { get; set; }

}

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