Question

我正在尝试使用以下代码序列化IEnumerable。我收到以下异常。

生成XML文档时出错。 “序列化DBML_Project.FixedBankAccount类型的对象时检测到循环引用。”}。

为什么会出现此错误？如何纠正？

注意：我已经在使用 InheritanceMapping 属性。

public class BankAccountAppService
{
    public RepositoryLayer.ILijosBankRepository AccountRepository { get; set; }

    public void FreezeAllAccountsForUser(int userId)
    {
        IEnumerable<DBML_Project.BankAccount> accounts = AccountRepository.GetAllAccountsForUser(userId);
        foreach (DBML_Project.BankAccount acc in accounts)
        {
            acc.Freeze();
        }

        System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
        System.Xml.XPath.XPathNavigator nav = xmlDoc.CreateNavigator();

        using (System.Xml.XmlWriter writer = nav.AppendChild())
        {
            System.Xml.Serialization.XmlSerializer ser = new System.Xml.Serialization.XmlSerializer(typeof(List<DBML_Project.BankAccount>)); 
            ser.Serialize(writer, accounts);
        }


    }

}

namespace DBML_Project
{
[System.Xml.Serialization.XmlInclude(typeof(FixedBankAccount))]
[System.Xml.Serialization.XmlInclude(typeof(SavingsBankAccount))]
public  partial class BankAccount
{
    //Define the domain behaviors
    public virtual void Freeze()
    {
        //Do nothing
    }
}

public class FixedBankAccount : BankAccount
{

    public override void Freeze()
    {
        this.Status = "FrozenFA";
    }
}

public class SavingsBankAccount : BankAccount
{

    public override void Freeze()
    {
        this.Status = "FrozenSB";
    }
}  
}

使用LINQ to SQL自动生成的类

[global::System.Data.Linq.Mapping.TableAttribute(Name="dbo.BankAccount")]
[InheritanceMapping(Code = "Fixed", Type = typeof(FixedBankAccount), IsDefault = true)]
[InheritanceMapping(Code = "Savings", Type = typeof(SavingsBankAccount))]
public partial class BankAccount : INotifyPropertyChanging, INotifyPropertyChanged

Answer 1

使用数据协定序列化程序而不是xmlserializer： http://jameskovacs.com/2006/11/18/going-around-in-circles-with-wcf/

序列化IEnumerable包含派生类：循环引用问题

1 个答案: