[TestFixture]
public class MongoCases_Linq3_Project_WithIgnoreField
{
    [Test]
    public async Task Test()
    {
        BsonSerializer.TryRegisterSerializer(new GuidSerializer(GuidRepresentation.CSharpLegacy));

        var mongoClientSettings = MongoClientSettings.FromConnectionString("mongodb://localhost:27017");
        var mongoClient = new MongoClient(mongoClientSettings);
        var db = mongoClient.GetDatabase(Guid.NewGuid().ToString()[..8]);
        var collection = db.GetCollection<UserDbo>("users");
        var guid = Guid.NewGuid();

        var userDbo = new UserDbo
        {
            Id = guid
        };
        await collection.InsertOneAsync(userDbo);

        var query = collection
            .Find(Builders<UserDbo>.Filter.Empty,
                new FindOptions
                {
                    TranslationOptions = new ExpressionTranslationOptions
                    {
                        EnableClientSideProjections = true
                    }
                })
            .Project(x => new UserDto(x.Id, x.MainEmail));

        var userInfo = await query.FirstOrDefaultAsync();

        // System.InvalidOperationException : Serializer for MongoCases.MongoCases_Linq3_Project_WithIgnoreField+UserDbo does not have a member named MainEmail.
        //  at MongoDB.Driver.Linq.Linq3Implementation.Misc.DocumentSerializerHelper.GetMemberSerializationInfo(IBsonSerializer serializer, String memberName)
        //  at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.MemberExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, MemberExpression expression)
        //  at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.ExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, Expression expression)
        //  at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.MemberInitExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, Expression expression, NewExpression newExpression, IReadOnlyList`1 bindings)
        //  at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.NewExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, NewExpression expression)
        //  at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.ExpressionToAggregationExpressionTranslator.Translate(TranslationContext context, Expression expression)
        //  at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.ExpressionToAggregationExpressionTranslator.TranslateLambdaBody(TranslationContext context, LambdaExpression lambdaExpression, Symbol parameterSymbol)
        //  at MongoDB.Driver.Linq.Linq3Implementation.Translators.ExpressionToAggregationExpressionTranslators.ExpressionToAggregationExpressionTranslator.TranslateLambdaBody(TranslationContext context, LambdaExpression lambdaExpression, IBsonSerializer parameterSerializer, Boolean asRoot)
        //  at MongoDB.Driver.Linq.LinqProviderAdapter.TranslateExpressionToProjection[TInput,TOutput](Expression`1 expression, IBsonSerializer`1 inputSerializer, ExpressionTranslationOptions translationOptions, Boolean forFind)
        //  at MongoDB.Driver.Linq.LinqProviderAdapter.TranslateExpressionToFindProjection[TSource,TProjection](Expression`1 expression, IBsonSerializer`1 sourceSerializer, IBsonSerializerRegistry serializerRegistry, ExpressionTranslationOptions translationOptions)
        //  at MongoDB.Driver.FindExpressionProjectionDefinition`2.Render(RenderArgs`1 args)

        Assert.That(userInfo, Is.Not.Null);
    }

    private sealed class UserDto
    {
        public UserDto(Guid id, string? mainEmail)
        {
            Id = id;
            MainEmail = mainEmail;
        }
        public Guid Id { get; }
        public string? MainEmail { get; }
    }

    private class UserDbo
    {
        [BsonId]
        public Guid Id { get; set; }
        [BsonElement("emails"), BsonRequired]
        public IEnumerable<string> Emails { get; set; }
        [BsonIgnore]
        public string? MainEmail => Emails?.FirstOrDefault();
    }
}