我无法反序列化实例之间具有继承关系的元素集合。
有人遇到过这个问题吗?
所以我的用例是这样的:
我的模型与此类似:
[DataContract]
public class Item
{
[DataMember]
public int Id { get; set; }
[DataMember]
public string Name { get; set; }
[DataMember]
public bool Valid { get; set; }
}
[DataContract]
public class IntermediateItem : Item
{
[DataMember]
public int Priority { get; set; }
}
[DataContract]
public class ExtendedItem : IntermediateItem
{
[DataMember]
public int Count { get; set; }
[DataMember]
public ItemsCollection Childs { get; set; }
}
Items Collection 是这样的:
[DataContract]
public class ItemsCollection : Collection<Item>
{
}
我为确保正确反序列化所做的设置是:
定义 CollectionFormatterBase:
public class ItemCollectionFormatterBase : CollectionFormatterBase<Item, ItemsCollection>
{
protected override ItemsCollection Create(int count)
{
return new ItemsCollection();
}
protected override void Add(ItemsCollection collection, int index, Item value)
{
collection.Add(value);
}
}
不起作用的例子,我的意思是,反序列化的实例都是基本类型,继承关系在序列化中丢失了一些。
例子:
MessagePack.Resolvers.CompositeResolver.RegisterAndSetAsDefault(new[] { new ItemCollectionFormatterBase() }, new[] { StandardResolver.Instance });
ExtendedItem instance = new ExtendedItem()
{
Id = 1,
Name = "Extended Item",
Priority = 121,
Valid = true,
Count = 10,
Childs = new ItemsCollection(new List<Item>() { new Item() { Id = 1 }, new IntermediateItem() { Priority = 10 }, new ExtendedItem() { Count = 10 } })
};
byte[] bytes = MessagePackSerializer.Serialize(instance);
using (FileStream file = new FileStream(this.filePath.AbsolutePath, FileMode.Create))
{
await file.WriteAsync(bytes , 0, payload.Length);
await file.FlushAsync();
}
using (FileStream file = new FileStream(testsFolder + @"\ExtendedItem.msgPack-csharp.dat", FileMode.Open))
{
file.Seek(0, SeekOrigin.Begin);
deserializedInstance = MessagePackSerializer.Deserialize<ExtendedItem>(file);
}
查看 deserializedInstance Childs 元素,它们都来自项目类型。
你能告诉我我做错了什么吗?缺什么 ?
关于项目定义的一个小更新:
[DataContract]
[KnownType(typeof(IntermediateItem))]
[KnownType(typeof(ExtendedItem))]
public class Item
{
[DataMember]
public int Id { get; set; }
[DataMember]
public string Name { get; set; }
[DataMember]
public bool Valid { get; set; }
}
这也是行不通的。 :(