NET type System.Guid cannot be mapped to a BsonValue

[AlonKNervio]

I get this error:
System.ArgumentException
HResult=0x80070057
Message=.NET type System.Guid cannot be mapped to a BsonValue.
Source=MongoDB.Bson
StackTrace:
at MongoDB.Bson.BsonTypeMapper.MapToBsonValue(Object value)

thrown from
internal static BsonValue? ToBsonValue(this LogEventPropertyValue? value)...

return BsonValue.Create(scalarValue.Value); //exception

[johnstaveley]

I started to get this error when I upgraded MongoDB.Driver from 3.1.3 to 4.0.0.

All my classes inherit from this:

public abstract class StringIdPostedBase : PostedBase
{
[BsonId]
public string Id { get; set; }
}

So I got hundreds of test failures.

[johnstaveley]

I started to get this error when I upgraded MongoDB.Driver from 3.1.3 to 4.0.0.

All my classes inherit from this:

public abstract class StringIdPostedBase : PostedBase { [BsonId] public string Id { get; set; } }

So I got hundreds of test failures.

Turns out I just needed to update the tests:
BsonSerializer.TryRegisterSerializer(new GuidSerializer(GuidRepresentation.Standard));