如何反序列化json对象？

Question

I know that normally the method Newtonsoft.Json.JsonConvert.DeserializeObject is used. However in this case I do a serialization, followed by a deserialization which doesn't work.

static public void mess(test message)
{
  try
  {
    test temp = new test(id); // The only thing I don't show is that I obtain a valid ObjectId in id
    string messageSerialized = Newtonsoft.Json.JsonConvert.SerializeObject(temp);
    Newtonsoft.Json.JsonConvert.DeserializeObject<test>(messageSerialized);
  }
  catch (Exception e)
  {
    Console.WriteLine(e.Message);
  }
}

I get the following exception: Error converting value "57ab57ba86597bac513ce130" to type MongoDB.Bson.ObjectId'. Path 'a', line 1, position 31."

I get that the problem is the type, however how could it serialize the type but not be able to deserialize it?

Structure of test:

   public class test
    {
        public MongoDB.Bson.ObjectId a;

        public test(MongoDB.Bson.ObjectId b)
        {
            a = b;
        }
    }


messageSerialized = "{\"a\":\"57ab57ba86597bac513ce130\"}"

Answer 1

Error converting value "here is an object ID" to type MongoDB.Bson.ObjectId'.

Yes, look at the error and as can see it's trying to deserialize the string "here is an object ID" to Bson.ObjectId which will never succeed. You should post your serialized JSON string along with structure of BrowsersObj .

Per your latest edit: "57ab57ba86597bac513ce130" is not a MongoDB ObjectId rather it's a string. Check your MongoDB collection and most probably you are not storing the _id as ObjectID rather you have overwritten them to store as string