使用C#MongoDB驱动程序,如何序列化对象引用的集合？

Question

我有两个类,例如:

public class A
{
    public string Id { get; set; }
    public string Name { get; set; }
    // Other properties...
}

public class B
{
    public string Id { get; set; }
    public ICollection<A> ReferredAObjects { get; set; }
    // Other properties...
}

我已经为A和B创建了带有BsonClassMap.RegisterClassMap()的类映射,因为它们被分开存储为相对集合.

当我尝试映射B时问题就开始了,因为我需要将A的集合映射为带有一些额外信息的外部文档的引用,所以在这种情况下我只需要映射id和名称.

如何为B创建一个类映射,仅在其中使用不同的映射？

Answer 1

BsonClassMap不是你的解决方案，你应该IBsonSerializer为B类编写你的自定义我刚刚实现了该Serialize方法，其Deserilze工作方式相同。

public class BSerialzer : IBsonSerializer
{
    public object Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options)
    {
        throw new NotImplementedException();
    }

    public object Deserialize(BsonReader bsonReader, Type nominalType, Type actualType, IBsonSerializationOptions options)
    {
        throw new NotImplementedException();
    }

    public IBsonSerializationOptions GetDefaultSerializationOptions()
    {
        throw new NotImplementedException();
    }

    public void Serialize(BsonWriter bsonWriter, Type nominalType, object value, IBsonSerializationOptions options)
    {
        var b = (B)value;
        bsonWriter.WriteStartDocument();

        bsonWriter.WriteString("_id", b.Id);            
        bsonWriter.WriteStartArray("refs");
        foreach (var refobj in b.ReferredAObjects)
        {
            bsonWriter.WriteString(refobj.Id);
        }
        bsonWriter.WriteEndArray();            

        bsonWriter.WriteEndDocument();
    }
}

对于下面对象的示例

var a0 = new A
{
    Id = "0",
    Name = "0",
};

var a1 = new A
{
    Id = "1",
    Name = "1",
};

var b = new B
{
    Id = "b0",
    ReferredAObjects = new Collection<A> { a0, a1 }
};

collection.Insert(b);

将产生如下输出：

{
    "_id" : "b0",
    "refs" : [ 
        "0", 
        "1"
    ]
}

Sterilizer请记住在程序启动时注册它：

BsonSerializer.RegisterSerializer(typeof(B), new BSerialzer());