Serialization.InvalidDataContractException未被处理

Question

public class SerializablionHelper
{
  public SerializablionHelper()
  {
    this.Entities = new Collection<Base>();
  }

  public ICollection<Base> Entities { get; set; }
}

// [DataContract]
// [KnownType(typeof(A))]
// [KnownType(typeof(B))]
public abstract class Base
{
}

[DataContract]
public class A : Base
{
  public int IntTest { get; set; }

  [DataMember]
  public string StringTest { get; set; }
}

[DataContract]
public class B : Base
{
  [DataMember]
  public int IntTest { get; set; }

  [DataMember]
  public string StringTest { get; set; }
}


public static void Main(string[] args)
{
  var objectA = new A { IntTest = 5, StringTest = "TestA" };
  var objectB = new B { IntTest = 25, StringTest = "TestB" };

  var serList = new SerializablionHelper();
  serList.Entities.Add(objectA);
  serList.Entities.Add(objectB);
  var dcSerializer = new DataContractSerializer(typeof(SerializablionHelper));


  var xmlWriterSetting = new XmlWriterSettings() { Indent = true };
  using (var xmlWriter = XmlWriter.Create("C:\\test.xml", xmlWriterSetting))
  {
    dcSerializer.WriteObject(xmlWriter, serList);
  }
}

当我运行这段代码时，我会得到这个异常。

类型'XMLSerializer.Program+A‘不能从未标记为DataContractAttribute或SerializableAttribute的类型继承。考虑使用DataContractAttribute或SerializableAttribute标记基类型‘DataContractAttribute’或SerializableAttribute，或者从派生类型中删除它们。

当我重新提出这个代码时：

// [DataContract]
// [KnownType(typeof(A))]
// [KnownType(typeof(B))]

密码会起作用的。

无法将基类设置为DataContract的问题。在不将DataContract添加到基类或我必须采取另一个序列化策略的情况下，是否有任何方法使此代码工作？

Answer 1

我想这样做：

[DataContract]
[KnownType(typeof(A))]
[KnownType(typeof(B))]
public class SerializablionHelper
{
  public SerializablionHelper()
  {
    //this.Entities = new Collection<Base>();
  }
    // public ICollection<Base> Entities { get; set; }

  public Base A { get; set; }

  public Base B { get; set; }
}

public abstract class Base
{
}

[DataContract]
public class A : Base
{
  [DataMember]
  public int IntTest { get; set; }

  [DataMember]
  public string StringTest { get; set; }
}

[DataContract]
public class B : Base
{
  [DataMember]
  public int IntTest { get; set; }

  [DataMember]
  public string StringTest { get; set; }
}


public static void Main(string[] args)
{
  var objectA = new A { IntTest = 5, StringTest = "TestA" };
  var objectB = new B { IntTest = 25, StringTest = "TestB" };

  var serList = new SerializablionHelper { A = objectA, B = objectB };
  var dcSerializer = new DataContractSerializer(typeof(SerializablionHelper));


  var xmlWriterSetting = new XmlWriterSettings() { Indent = true };
  using (var xmlWriter = XmlWriter.Create("C:\\test.xml", xmlWriterSetting))
  {
    dcSerializer.WriteObject(xmlWriter, serList);
  }
}

我希望这能帮上忙。