Npgsql.NpgsqlCopySerializer.AddNumber C# (CSharp) Method

        public void AddNumber(double fieldValue)
        {
            AddString(string.Format(_cultureInfo, "{0}", fieldValue));
        }

        public void InvariantCultureNpgsqlCopySerializer()
        {
            // Test for https://github.com/npgsql/Npgsql/pull/92
            // SetCulture is used to set a culture where a comma is used to separate decimal values (0,5) which will cause problems if Npgsql 
            // doesn't convert correctly to use a point. (0.5)

            var cmd = new NpgsqlCommand("COPY data (field_int4, field_int8, field_float4) FROM STDIN", Conn);
            var npgsqlCopySerializer = new NpgsqlCopySerializer(Conn);
            var npgsqlCopyIn = new NpgsqlCopyIn(cmd, Conn, npgsqlCopySerializer.ToStream);

            npgsqlCopyIn.Start();
            npgsqlCopySerializer.AddInt32(300000);
            npgsqlCopySerializer.AddInt64(1000000);
            npgsqlCopySerializer.AddNumber(0.5);
            npgsqlCopySerializer.EndRow();
            npgsqlCopySerializer.Flush();
            npgsqlCopyIn.End();

            NpgsqlDataReader dr = new NpgsqlCommand("select field_int4, field_int8, field_float4 from data", Conn).ExecuteReader();
            dr.Read();

            Assert.AreEqual(300000, dr[0]);
            Assert.AreEqual(1000000, dr[1]);
            Assert.AreEqual(0.5, dr[2]);
        }