字典<字符串，对象>至BsonDocument的转换省略了_t字段 [英] Dictionary<string, object>-to-BsonDocument conversion omitting _t field

问题描述

我正在使用MongoDB.Bson中的ToBsonDocument扩展方法来转换此词典:

I'm using ToBsonDocument extension method from MongoDB.Bson to convert this Dictionary:

        var dictionary = new Dictionary<string, object> {{"person", new Dictionary<string, object> {{"name", "John"}}}};
        var document = dictionary.ToBsonDocument();

这是生成的文档:

  { "person" : 
      { "_t" : "System.Collections.Generic.Dictionary`2[System.String,System.Object]", 
        "_v" : { "name" : "John" } } }

是否有办法摆脱这些_t/_v东西?我希望生成的文档看起来像这样:

Is there a way to get rid of these _t/_v stuff? I would like the resulting document to look like this:

  { "person" : { "name" : "John" } }

---

UPD:我在DictionaryGenericSerializer中找到了代码:

---

UPD: I've found the code in DictionaryGenericSerializer:

if (nominalType == typeof(object))
{
    var actualType = value.GetType();
    bsonWriter.WriteStartDocument();
    bsonWriter.WriteString("_t", TypeNameDiscriminator.GetDiscriminator(actualType));
    bsonWriter.WriteName("_v");
    Serialize(bsonWriter, actualType, value, options); // recursive call replacing nominalType with actualType
    bsonWriter.WriteEndDocument();
    return;
}

因此，当值类型为object时，此序列化程序似乎没有太多选项.

So, it seems that there are not too many options with this serializer when the value type is object.

推荐答案

您应首先序列化为JSON，然后序列化为BSON，

You shall first serialize to JSON and then to BSON,

var jsonDoc = Newtonsoft.Json.JsonConvert.SerializeObject(dictionary);
var bsonDoc = MongoDB.Bson.Serialization.BsonSerializer.Deserialize<BsonDocument>(jsonDoc);

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