具有继承的DataContract？答案

【问题标题】：DataContract with inheritance?具有继承的DataContract？
【发布时间】：2011-09-21 15:36:38
【问题描述】：

我有一个带有序列化和反序列化对象列表的类：

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

有子类的类：

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

现在奇怪的是，反序列化敌人数组将包含正确反序列化的 BigBase 类，但每个 Medium 和 Small 类都没有正确的 isMoving 值。

【问题讨论】：

没有一些示例测试代码我怀疑有人会想帮助你。

标签： c# inheritance datacontract known-types

【解决方案1】：

你需要在Manager上加上KnownType属性：

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

因为它的 Manager 有一个 BigBase 数组，其元素也可能是派生类。所以DataContractSerializer 将知道在序列化和反序列化Manager 对象（而且都是DataMember）时对数组的期望。

【讨论】：

【解决方案2】：

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

我在这个测试代码中没有看到。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);

【讨论】：