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  1. C# Driver
  2. CSHARP-4650

LINQ3 provider: ValueType 'X' of parameterSerializer does not match parameter type 'Y' (where X is a subclass of Y)

    • Type: Icon: Bug Bug
    • Resolution: Duplicate
    • Priority: Icon: Minor - P4 Minor - P4
    • None
    • Affects Version/s: 2.19.1
    • Component/s: LINQ3
    • None
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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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      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?

      Summary

      The latest MongoDB.Driver for C# switched the default LINQ Provider from 2 to 3. After trying to upgrade and use version 3 the code that used to work in V2 fails in V3.

      Server versions: 5.0.13 Windows and 5.0.10 Ubuntu

      How to Reproduce

          internal class Program
          {
              private static void Main(string[] args)
              {
                  foreach (var linqProvider in new []\{ LinqProvider.V2, LinqProvider.V3})
                  {
                      var builder = new MongoUrlBuilder
                      {
                          DatabaseName = "Sample",
                          Server = new MongoServerAddress("localhost", 27017)
                      };
                      var mongoClientSettings = MongoClientSettings.FromUrl(builder.ToMongoUrl());
                      mongoClientSettings.LinqProvider = linqProvider;
                      var mongoClient = new MongoClient(mongoClientSettings);
                      var mongoDatabase = mongoClient.GetDatabase(builder.DatabaseName);
      
                      var licensePlate = "5555XXX";
      
                      var carCollection = mongoDatabase.GetCollection<Car>("Cars");
                      carCollection.DeleteMany(c => true);
                      carCollection.InsertOne(new Car
                      {
                          Id = licensePlate,
                          Description = $"\{linqProvider} - Description for license: \{licensePlate}"
                      });
      
                      var deletedCarCollection = mongoDatabase.GetCollection<DeletedCar>("DeletedCars");
                      deletedCarCollection.DeleteMany(c => true);
                      deletedCarCollection.InsertOne(new DeletedCar
                      {
                          Id = licensePlate,
                          Description = $"\{linqProvider} - Deleted - Description for license: \{licensePlate}",
                          DeletedDate = DateTime.UtcNow.AddDays(-1)
                      });
      
                      Console.WriteLine(GetCarDescription_Works(carCollection.AsQueryable(), licensePlate));
                      Console.WriteLine(GetCarDescription_Works(deletedCarCollection.AsQueryable(), licensePlate));
                      Console.WriteLine();
                      Console.WriteLine(GetCarDescription_Fails(carCollection.AsQueryable(), licensePlate));
                      Console.WriteLine(GetCarDescription_Fails(deletedCarCollection.AsQueryable(), licensePlate));
                      Console.WriteLine();
                      Console.WriteLine();
                  }
              }
      
              private static string GetCarDescription_Works<T>(IQueryable<T> queryable, string licensePlate) where T : Car
              {
                  return queryable.Where(d => d.Id == licensePlate).Select(d => d.Description).FirstOrDefault();
              }
      
              private static string GetCarDescription_Fails(IQueryable<Car> queryable, string licensePlate)
              {
                  return queryable.Where(d => d.Id == licensePlate).Select(d => d.Description).FirstOrDefault();
              }
      
              private class Car
              {
                  public string Id \{ get; set; }
                  public string Description \{ get; set; }
              }
      
              private class DeletedCar : Car
              {
                  public DateTime DeletedDate \{ get; set; }
              }
          }
      

       

      Execution output:

      Description for license: 5555XXX
      Deleted - Description for license: 5555XXX
      
      Description for license: 5555XXX
      
      Unhandled Exception: System.ArgumentException: ValueType 'Sample.Program+DeletedCar' of parameterSerializer does not match parameter type 'Sample.Program+Car'.
      Parameter name: parameterSerializer
         at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToFilterTranslators.ExpressionToFilterTranslator.TranslateLambda(TranslationContext context, LambdaExpression lambdaExpression, IBsonSerializer parameterSerializer, Boolean asRoot)
         at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.WhereMethodToPipelineTranslator.Translate(TranslationContext context, MethodCallExpression expression)
         at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.ExpressionToPipelineTranslator.Translate(TranslationContext context, Expression expression)
         at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.SelectMethodToPipelineTranslator.Translate(TranslationContext context, MethodCallExpression expression)
         at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToPipelineTranslators.ExpressionToPipelineTranslator.Translate(TranslationContext context, Expression expression)
         at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToExecutableQueryTranslators.FirstMethodToExecutableQueryTranslator`1.Translate[TDocument](MongoQueryProvider`1 provider, TranslationContext context, MethodCallExpression expression)
         at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToExecutableQueryTranslators.ExpressionToExecutableQueryTranslator.TranslateScalar[TDocument,TResult](MongoQueryProvider`1 provider, Expression expression)
         at MongoDB.Driver.Linq.Linq3Implementation.MongoQueryProvider`1.Execute[TResult](Expression expression)
         at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
         at Sample.Program.GetCarDescription_Fails(IQueryable`1 queryable, String licensePlate) in D:\tfs2015\Shared\Packages\Panda.DataAccess\Sample\Program.cs:line 53
         at Sample.Program.Main(String[] args) in D:\tfs2015\Shared\Packages\Panda.DataAccess\Sample\Program.cs:line 43
      

            Assignee:
            robert@mongodb.com Robert Stam
            Reporter:
            suikevil Roberto Pérez
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            Watchers:
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              Created:
              Updated:
              Resolved: