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Type:
Bug
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Resolution: Done
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Priority:
Minor - P4
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Affects Version/s: 2.2
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Fully Compatible
When using: yourMongoCollection.AsQueryable().Select(projectionExpression).ToList() in versions greater than 2.1.X it fails.
The examples below just call Count() for demonstration purposes.
internal class Program { internal class Person { public Guid Id { get; set; } public string Name { get; set; } } private static void Main(string[] args) { // RegisterConventions var conventionPack = new ConventionPack { new IgnoreIfNullConvention(true), new NoIdMemberConvention() }; ConventionRegistry.Register("GlobalConventions", conventionPack, t => true); // Mapping People collection var map = BsonClassMap.RegisterClassMap<Person>(); map.AutoMap(); map.MapProperty(c => c.Id).SetIsRequired(true); map.SetIdMember(map.GetMemberMap(c => c.Id)); // Creating mongo client and dropping collection var mongoClient = new MongoClient("mongodb://buildbee"); var mongoDatabase = mongoClient.GetDatabase("db"); mongoDatabase.DropCollectionAsync("people").Wait(); var peopleCollection = mongoDatabase.GetCollection<Person>("people"); // one document is inserted peopleCollection.InsertOneAsync(new Person { Id = Guid.NewGuid(), Name = "A" }).Wait(); DoIt("1- Count", () => peopleCollection.AsQueryable().Count()); DoIt("2- ToList Without Select", () => peopleCollection.AsQueryable().ToList().Count); DoIt("3.1- ToList With Select", () => peopleCollection.AsQueryable().Select(p => p).ToList().Count); DoIt("3.2- ToList With Select", () => peopleCollection.AsQueryable().Select(p => new Person { Id = p.Id, Name = p.Name, }).ToList().Count); DoIt("3.3- ToList With Select", () => peopleCollection.AsQueryable().Select(p => new Person { Id = p.Id, // Name = p.Name, }).ToList().Count); DoIt("3.4- ToList With Select", () => peopleCollection.AsQueryable().Select(p => new Person { // Id = p.Id, Name = p.Name, }).ToList().Count); } private static void DoIt(string message, Func<int> countQuery) { try { Console.WriteLine(message); Console.WriteLine(countQuery()); } catch (Exception e) { Console.WriteLine(e); } Console.WriteLine(); } }
1- Count
1
2- ToList Without Select
1
3.1- ToList With Select
1
3.2- ToList With Select
1
3.3- ToList With Select
1
3.4- ToList With Select
1
Press any key to continue . . .
1- Count
1
2- ToList Without Select
1
3.1- ToList With Select
1
3.2- ToList With Select
System.FormatException: Element 'Id' does not match any field or property of class ConsoleApplication1.Program+Person.
at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute(Expression expression)
at MongoDB.Driver.Linq.MongoQueryableImpl`2.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at ...
3.3- ToList With Select
System.FormatException: Element 'Id' does not match any field or property of class ConsoleApplication1.Program+Person.
at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute(Expression expression)
at MongoDB.Driver.Linq.MongoQueryableImpl`2.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at ...
3.4- ToList With Select
System.FormatException: Required element '_id' for property 'Id' of class ConsoleApplication1.Program+Person is missing.
at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute(Expression expression)
at MongoDB.Driver.Linq.MongoQueryableImpl`2.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at ...
Press any key to continue . . .
- is duplicated by
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CSHARP-1606 Error using Select function
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- Closed
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- is related to
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CSHARP-1719 Selecting from a IMongoQueryable collection with a Linq Expression throws an error because of 'Id' property
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- Closed
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CSHARP-1745 Deserialization issue when using GroupBy
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- Closed
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