我有一个相当复杂的继承层次结构,包括泛型,我们正在尝试使用protobuf .net进行序列化。不幸的是,它似乎无法正确处理这种情况。这就是层次结构的样子。
[System.Runtime.Serialization.DataContract]
[ProtoBuf.ProtoInclude(1000, typeof(GenericBaseClass<object>))]
[ProtoBuf.ProtoInclude(1001, typeof(GenericBaseClass<string>))]
public abstract class BaseClass
{
public int BaseProperty1 { set; get; }
public int BaseProperty2 { set; get; }
public BaseClass()
{
}
}
[System.Runtime.Serialization.DataContract]
[ProtoBuf.ProtoInclude(1002, typeof(GenericDerivedClass<object>))]
[ProtoBuf.ProtoInclude(1003, typeof(GenericDerivedClass<string>))]
public abstract class GenericBaseClass<T> : BaseClass
{
/// <summary>
///
/// </summary>
[System.Runtime.Serialization.DataMember(Order = 5)]
public T ResponseProperty
{
get;
set;
}
public GenericBaseClass()
{
}
}
[System.Runtime.Serialization.DataContract]
[ProtoBuf.ProtoInclude(1004, typeof(DerivedClass1))]
[ProtoBuf.ProtoInclude(1005, typeof(DerivedClass2))]
public abstract class GenericDerivedClass<T> : GenericBaseClass<T>
{
public int AdditionalProperty { get; set; }
public GenericDerivedClass()
{
}
}
最后,这些类由两个封闭构造的非泛型类
实现 [System.Runtime.Serialization.DataContract]
public class DerivedClass1 : GenericDerivedClass<string>
{
[System.Runtime.Serialization.DataMember(Order = 6)]
public int DerivedClass1Property { set; get; }
}
[System.Runtime.Serialization.DataContract]
public class DerivedClass2 : GenericDerivedClass<object>
{
[System.Runtime.Serialization.DataMember(Order = 7)]
public int DerivedClass2Property { set; get; }
}
我已经编写了以下测试方法来序列化这些并且它给了我错误。
[TestMethod]
public void SerializeDeserializeAndCompare()
{
DerivedClass2 i = new DerivedClass2() { BaseProperty1 = 1, BaseProperty2 = 2, DerivedClass2Property = 3, ResponseProperty = new Object() };
using (var file = System.IO.File.Create("test.bin"))
{
ProtoBuf.Serializer.Serialize(file, i);
}
using (var file = System.IO.File.OpenRead("test.bin"))
{
var o = ProtoBuf.Serializer.Deserialize<DerivedClass2>(file);
}
}
我得到的错误是
ProtoBuf.ProtoException:一个类型只能参与一个继承层次结构(CapitalIQ.DataGet.UnitTests.DataSetUnitTest + DerivedClass2)---&gt; System.InvalidOperationException:类型只能参与一个继承层次结构
这是protobuf .net的限制还是我做错了。我使用的是r282版本。
由于 Shobhit
答案 0 :(得分:4)
与所有属性一样,属性中包含的类型信息适用于泛型类型定义中的所有封闭类型。因此,您实际定义的(对protobuf-net)是:
BaseClass
: GenericBaseClass<object>
: GenericDerivedClass<object>
: DerivedClass1
: DerivedClass2
: GenericDerivedClass<string>
: DerivedClass1
: DerivedClass2
: GenericBaseClass<string>
: GenericDerivedClass<object>
: DerivedClass1
: DerivedClass2
: GenericDerivedClass<string>
: DerivedClass1
: DerivedClass2
正如你所看到的,有很多重复 - 这显然令人困惑。由于属性参数不能使用类型参数,因此可以选择添加某种奇怪的谓词机制,这对IMO来说非常困惑。 IMO,手动建模(删除ProtoInclude
属性)会更好。我怀疑您想要的型号是:
BaseClass
: GenericBaseClass<object>
: GenericDerivedClass<object>
: DerivedClass2
: GenericBaseClass<string>
: GenericDerivedClass<string>
: DerivedClass1
protobuf-net可以使用它,但是解释模型需要&#34; v2&#34;和RuntimeTypeModel
:
另请注意,object
对于protobuf来说有点问题; protobuf-net可以使用动态类型选项伪造它,但那是......不理想。它当然不能序列化object
,所以对于测试我已经替换了一个字符串。另请注意,BaseProperty1
,BaseProperty2
和AdditionalProperty
目前尚未标记为序列化,但可以简单。
反正:
RuntimeTypeModel.Default[typeof(BaseClass)]
.AddSubType(10, typeof(GenericBaseClass<object>))
.AddSubType(11, typeof(GenericBaseClass<string>));
RuntimeTypeModel.Default[typeof(GenericBaseClass<object>)]
.AddSubType(10, typeof(GenericDerivedClass<object>));
RuntimeTypeModel.Default[typeof(GenericBaseClass<object>)][5].DynamicType = true; // object!
RuntimeTypeModel.Default[typeof(GenericDerivedClass<object>)]
.AddSubType(10, typeof(DerivedClass2));
RuntimeTypeModel.Default[typeof(GenericBaseClass<string>)]
.AddSubType(10, typeof(GenericDerivedClass<string>));
RuntimeTypeModel.Default[typeof(GenericDerivedClass<string>)]
.AddSubType(10, typeof(DerivedClass1));
DerivedClass2 i = new DerivedClass2() { BaseProperty1 = 1, BaseProperty2 = 2, DerivedClass2Property = 3, ResponseProperty = "some string" };
using (var file = System.IO.File.Create("test.bin"))
{
ProtoBuf.Serializer.Serialize(file, i);
}
using (var file = System.IO.File.OpenRead("test.bin"))
{
var o = ProtoBuf.Serializer.Deserialize<DerivedClass2>(file);
}
你没有 使用RuntimeTypeModel.Default
- 事实上,我建议使用(和缓存)一个单独的类型模型;但是Serializer.Serialize
指向默认模型。如果您创建自定义模型(TypeModel.Create
),只需将其存储在某处并使用Serialize
等。