C ++ / CLI代码中的内存泄漏

Question

The test app:

static void Main(string[] args)
    {
        String connectionString = "DSN=DotNetUltraLightDSII; UID=user; PWD=pass";
        String query = "select * from person";

        using (OdbcConnection connection = new OdbcConnection(connectionString))
        {
            connection.Open();
            for (Int32 trial = 1; trial <= 100000; trial++)
            {
                if (0 == trial % 1000)
                {
                    Console.WriteLine("Executing trial #{0:#,0}", trial);
                    GC.Collect();
                }

                using (OdbcCommand command = new OdbcCommand(query, connection))
                {
                    using (OdbcDataReader reader = command.ExecuteReader())
                    {
                        do
                        {
                            while (reader.Read())
                            {
                                for (Int32 colIndex = 0; colIndex < reader.FieldCount; colIndex++)
                                {
                                    Object x = reader[colIndex];
                                    IDisposable d = x as IDisposable;
                                    if (null != d)
                                    {
                                        d.Dispose();
                                    }
                                    d = null;
                                    x = null;
                                }
                            }
                        } while (reader.NextResult());
                        reader.Close();
                    }
                }
            }

            connection.Close();
        }

Memory usage Heap Snapshot Comparison

The memory usage just goes up over time. It seems like there are strong handles to the ULPersonTable but I cannot tell what exactly these strong handles are or where they are coming from. We are storing the instances of that type inside gcroot, but they seem to be destroyed. If someone could shed some light on this issue, that would be appreciated.

Regards

Answer 1

Ended up finding the problem. It was a pointer which wasn't being deleted properly.