ReadInt64只能在CurrentBsonType为Int64时调用，不能在CurrentBsonType为Int32时调用

Question

i am storing the ReceiveDate field as Array type in MongoDb And in the code, i am using the DateTimeOffset datatype for the associated field.

While performing the Deserialization, i get the below error:

An error occurred while deserializing the ReceiveDate property of class Models.ServiceEvent: ReadInt64 can only be called when CurrentBsonType is Int64, not when CurrentBsonType is Int32. ---> System.InvalidOperationException: ReadInt64 can only be called when CurrentBsonType is Int64, not when CurrentBsonType is Int32. at MongoDB.Bson.IO.BsonReader.VerifyBsonType(String methodName, BsonType requiredBsonType)

MongoDb Field:

My deserialization Method:

public override DateTimeOffset Deserialize(BsonDeserializationContext context, 
   BsonDeserializationArgs args)
{
    var bsonReader = context.Reader;
    long ticks;
    TimeSpan offset = new TimeSpan(0);

    BsonType bsonType = bsonReader.GetCurrentBsonType();
    switch (bsonType)
    {
       
        case BsonType.Array:
                bsonReader.ReadStartArray();
                ticks = bsonReader.ReadInt64();
            
            
            try
            {
                offset = TimeSpan.FromMinutes(bsonReader.ReadInt32());
            }
            catch
            {
                bsonReader.ReadDouble();
                offset = new TimeSpan(0);
            }
            bsonReader.ReadEndArray();
            return new DateTimeOffset(ticks, offset);

        case BsonType.Document:
            ticks = 0;
            offset = TimeSpan.Zero;
            _helper.DeserializeMembers(context, (elementName, flag) =>
            {
                switch (flag)
                {
                    case Flags.DateTime: bsonReader.SkipValue(); break; // ignore value
                    case Flags.Ticks: ticks = _int64Serializer.Deserialize(context); break;
                    case Flags.Offset: offset = TimeSpan.FromMinutes(_int32Serializer.Deserialize(context)); break;
                }
            });
            return new DateTimeOffset(ticks, offset);

        case BsonType.String:
            return JsonConvert.ToDateTimeOffset(bsonReader.ReadString());

        default:
            throw CreateCannotDeserializeFromBsonTypeException(bsonType);
    }
}

Model.cs Property:

public DateTimeOffset ReceiveDate { get; set; }

Can anyone please help me with this error?

Answer 1

You can analyze the data type of the current field before reading it, like:

case BsonType.Array:
  bsonReader.ReadStartArray();
  if (bsonReader.CurrentBsonType == BsonType.Int64)
    ticks = bsonReader.ReadInt64();
  else if (bsonReader.CurrentBsonType == BsonType.Int32)
    ticks = (long)bsonReader.ReadInt32();
  else
    throw ...