让我们说我们有一个关键值,它们的意义上是多态的.考虑下一个示例项目：
public class ToBeSerialized
{
[BsonId]
public ObjectId MongoId;
public IDictionary<string,BaseType> Dictionary;
}
public abstract class BaseType
{
}
public class Type1 : BaseType
{
public string Value1;
}
public class Type2:BaseType
{
public string Value1;
public string Value2;
}
internal class Program
{
public static void Main()
{
var objectToSave = new ToBeSerialized
{
MongoId = ObjectId.GenerateNewId(),Dictionary = new Dictionary<string,BaseType>
{
{"OdEd1",new Type1 {Value1="value1"}},{
"OdEd2",new Type1 {Value1="value1"}
}
}
};
string connectionString = "mongodb://localhost/Serialization";
var mgsb = new MongoUrlBuilder(connectionString);
var MongoServer = MongoDB.Driver.MongoServer.Create(mgsb.ToMongoUrl());
var MongoDatabase = MongoServer.GetDatabase(mgsb.DatabaseName);
MongoCollection<ToBeSerialized> mongoCollection = MongoDatabase.GetCollection<ToBeSerialized>("Dictionary");
mongoCollection.Save(objectToSave);
ToBeSerialized received = mongoCollection.FindOne();
}
}
有时当我尝试反序列化它时,我会得到反序列化错误,例如“Unknown discriminator value’具体类型的名称’”.我究竟做错了什么？如果每个值存储_t为什么它不能正确映射？
解决方法
驱动程序应该知道所有鉴别器以反序列化任何类而不会出错.有两种方法可以做到：
1.在应用启动期间全局注册：
BsonClassMap.RegisterClassMap<Type1>(); BsonClassMap.RegisterClassMap<Type2>();
2.或者BsonKnownTypes attibute：
[BsonKnownTypes(typeof(Type1),typeof(Type2)]
public class BaseType
{
}
如果您将使用#1或#2,则反序列化将正常工作.
