C# 序列化异常：不需要数据协定

将对象序列化为XML时，我收到以下异常消息：

{"Type 'Alerter.EmailSender' with data contract name  'EmailSender:http://schemas.datacontract.org/2004/07/Alerter' is not expected. Consider using a DataContractResolver or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer."}

这是我试图将其对象序列化为XML文件的类：

namespace Alerter
{
  [DataContract]
  public class EmailSender : IAction
  {
    private EmailSetting _emailSetting;
    private SmtpClient _smtpClient;
    [DataMember]
    public bool IncludeFullDetails
    {
        get;
        set;
    }
    [DataMember]
    public string[] Receivers
    {
        get;
        set;
    }

    public EmailSender()
    {
        _emailSetting = new EmailSetting();
        SetupClient();
    }

    private void SetupClient()
    {
        // Some Logic
    }


    public void Report(LogDictionary logDictionary)
    {
       // Some Logic
    }
   }
 }

这是我用于序列化的代码：

 using (FileStream writer = new FileStream(fileName, FileMode.Create))
        {
            DataContractSerializer ser =
                new DataContractSerializer(typeof(List<Rule>));
            ser.WriteObject(writer, list);
        }

使用（FileStream writer=newfilestream（fileName，FileMode.Create））
{
数据序列化程序=
新的DataContractSerializer（typeof（List））；
ser.WriteObject（writer，list）；
}

---

非常感谢您的帮助。

请确保已使用以下命令将此

EmailSender

类指定为序列化程序的已知类型：

DataContractSerializer ser=新的DataContractSerializer(
类型（列表），
新[]{typeof（EmailSender）}
);
ser.WriteObject（writer，list）；

之所以需要这样做，可能是因为在

规则

类的对象图中，您只对所有成员使用了

IAction

接口，而序列化程序甚至不知道

EmailSender

实现的存在

对于

规则

对象图中静态未知的所有其他类型，您应该执行相同的操作

DataContractSerializer ser = new DataContractSerializer(
    typeof(List<Rule>), 
    new[] { typeof(EmailSender) }
);
ser.WriteObject(writer, list);