Stack overflow caused by C ＃ using protobuf stack overflow

Direct explanation :

[ProtoBuf.ProtoContract]
[ProtoBuf.ProtoInclude(11, typeof(Cat))]
[ProtoBuf.ProtoInclude(12, typeof(Dog))]
public abstract class Animal
{
[ProtoBuf.ProtoMember(1)]
public string name;
[ProtoBuf.ProtoMember(2)]
public int sex;
}

[ProtoBuf.ProtoContract]
public class Cat : Animal
{
[ProtoBuf.ProtoMember(1)]
public int value1;
}

[ProtoBuf.ProtoContract]
public class Dog : Animal
{
[ProtoBuf.ProtoMember(1)]
public int value1;
[ProtoBuf.ProtoMember(2)]
public int value2;
}

[ProtoBuf.ProtoContract]
public class Role
{
[ProtoBuf.ProtoMember(1)]
public Animal animal = new Dog();
}

Declare the above class , among Cat,Dog All inherited from Animal, And then in Role Declare a Animal class , And give the initial value new Dog()
explain Role By default animal Namely Dog
Then perform the following method :
private static void Test()
{
Role role = new Role();
role.animal = new Cat();
var buffer = ProtobufSerialize.Serialize(role);
var role2 = ProtobufSerialize.Deserialize(buffer);
}
That is change Role in animal The variable type is Cat, It can lead to Protobuf Serialization generation Stack overflow. Stack overflow problem

resolvent :

If a variable or field of a type needs to be serialized , And this field is a parent class , The initial object cannot be given
the Role The type is changed to the following way
[ProtoBuf.ProtoContract]
public class Role
{
[ProtoBuf.ProtoMember(1)]
public Animal animal;
}