NullReferenceException when using certain projections

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Unknown
    • 2.19.2
    • Affects Version/s: None
    • Component/s: None
    • None
    • None
    • Fully Compatible
    • Not Needed
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      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?
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      Summary

      I found a case in which using AsQueryable() throws NRE. Driver version: 2.19.1.

      How to Reproduce

      I have this model:

      class Model
{
    public Guid NotId { get; set; }
    public string Name { get; set; }
}

      The query is:

      var collection = database.GetCollection<Model>("models");
var query = await collection.AsQueryable()
    .GroupBy(x => x.Name)
    .Select(x => new Model
    {
        NotId = Guid.Empty,
        Name = x.Key
    })
    .ToListAsync(); // throws NRE

      Additional Background

      I am using V3 guid serialization:

      BsonDefaults.GuidRepresentationMode = GuidRepresentationMode.V3;
BsonSerializer.RegisterSerializer(new GuidSerializer(GuidRepresentation.Standard));

      Workarounds

      I found two workarounds:

      1. Modify the projection to return anonymous type instead of Model
      2. Change the return type of Model.NotId to Guid?

            Assignee:
            Robert Stam
            Reporter:
            Dan Marinescu
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              Created:
              Updated:
              Resolved: