蒙戈C＃驱动程序：反序列化BsonValue

问题描述

我在MongoDB中的文档的结构类似于这样：

I have a document in mongodb that is structured similar to this:

{
  "_id": "abcdef01234",
  "Name": "Product A",
  "Dimensions": [
    {
      "Height": 32,
      "Width": 64
    },
    {
      "Height": 16,
      "Width": 32
    },
    {
      "Height": 8,
      "Width": 16
    }
  ]
}

我也有定义为表示尺寸（从上面的子文件）

I also have a class defined to represent dimensions (the sub document from above)

public class Dimension
{
  public int Height { get; set; }
  public int Width { get; set; }
}

我选择以这种方式产品A的文件：

I am selecting the "Product A" document in this manner:

MongoServer srv = MongoServer.Create(myConnStr);
BsonDocument doc = srv["db"]["products"].FindOneById(ObjectId.Parse("abcdef01234"));
BsonValue dimensionsVal = doc["Dimensions"];

现在我有一个名为dimensionsVal BsonValue它的类型是BsonArray的。我真正想要的是一个List<尺寸取代。如何转换dimensionsVal到List<尺寸>

Now I have a BsonValue named dimensionsVal which is of type BsonArray. What I really want is a List<Dimension>. How do I convert dimensionsVal to a List<Dimension>?

修改
尺寸类实际上是比显著更复杂的我描述。我想保持独立的尺寸从产品，因为内存的担忧。我想保持产品在内存中，但尺寸不是（潜在的巨大）名单。出于这个原因，我不希望有一个List作为产品类的属性。

EditThe dimension class is actually significantly more complex than what I described. I want to keep the Dimensions separate from the Product because of memory concerns. I want to keep the Product in memory, but not the (potentially enormous) list of dimensions. For this reason, I don't want to have a List as a property of the Product class.

推荐答案

下面是怎么了可以做到：

Here is how it can be done:

using MongoDB.Bson.Serialization;

MongoServer srv = MongoServer.Create(myConnStr);
BsonDocument doc = srv["db"]["products"].FindOneById(ObjectId.Parse("abcdef01234"));
BsonValue dimVal = doc["Dimensions"];
List<Dimension> d = BsonSerializer.Deserialize<List<Dimension>>(dimVal.ToJson());

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