继承的DataContract？

Question

我有一个包含序列化和反序列化的对象列表的类：

[DataContract]
public class Manager
{
  [DataMember]
  public BigBase[] enemies;
}

包含子类的类：

[DataContract]
[KnownType(typeof(Medium))]
[KnownType(typeof(Small))]
public class BigBase
{
    [DataMember]
    public bool isMoving;
}
[DataContract]
public class Medium : BigBase
{
}
[DataContract]
public class Small: BigBase
{
}

现在，当反序列化时奇怪的是，敌方数组将包含正确反序列化的BigBase类，但是每个中型和小型类都没有正确的isMoving值。

Answer 1

您需要在Manager上放置KnownType属性

[DataContract]
[KnownType(typeof(Medium))]
[KnownType(typeof(Small))]
public class Manager
{
  [DataMember]
  public BigBase[] enemies;
}

因为它是管理器，它有一个BigBase数组，它的元素也可能是派生类。因此，当序列化和反序列化Manager对象时，DataContractSerializer将知道期望从数组得到什么(并且它都是DataMember)。

Answer 2

[DataContract]
public class Medium : BigBase
{
    [DataMember]
    public string UpgradedName;
}

我在这段测试代码中看不到这一点。我认为你的序列化代码是错误的。

示例调用：

Manager test = new Manager();

            Medium medium = new Medium() {isMoving = true,Name = "medium", UpgradedName = "mediaum name"};
            //some items in array
            test.enemies = new BigBase[] {medium,new Small{isMoving = false},new Small{isMoving = true}, new BigBase {Name = "bigbase", isMoving = true}, new BigBase {Name = "bigbase2", isMoving = true}, new BigBase {Name = "bigbase3", isMoving = true}} ;

            DataContractSerializer serializer = new DataContractSerializer(typeof (Manager));
            FileStream writer = new FileStream("test123.txt", FileMode.Create);
            serializer.WriteObject(writer, test);
            writer.Close();
            writer = new FileStream("test123.txt", FileMode.Open);
            Manager deserializedmanager = serializer.ReadObject(writer) as Manager;
            //verify serialized object
            Console.WriteLine("medium object:"+ (deserializedmanager.enemies[0]  as Medium).UpgradedName);