System.Data.Common.DataAdapter.FillSchemaFromReader C# (CSharp) Method

        internal object FillSchemaFromReader(DataSet dataset, DataTable datatable, SchemaType schemaType, string srcTable, IDataReader dataReader)
        {
            DataTable[] dataTables = null;
            int schemaCount = 0;
            do
            {
                DataReaderContainer readerHandler = DataReaderContainer.Create(dataReader, ReturnProviderSpecificTypes);

                AssertReaderHandleFieldCount(readerHandler);
                if (0 >= readerHandler.FieldCount)
                {
                    continue;
                }
                string tmp = null;
                if (null != dataset)
                {
                    tmp = DataAdapter.GetSourceTableName(srcTable, schemaCount);
                    schemaCount++; // don't increment if no SchemaTable ( a non-row returning result )
                }

                SchemaMapping mapping = new SchemaMapping(this, dataset, datatable, readerHandler, true, schemaType, tmp, false, null, null);

                if (null != datatable)
                {
                    // do not read remaining results in single DataTable case
                    return mapping.DataTable;
                }
                else if (null != mapping.DataTable)
                {
                    if (null == dataTables)
                    {
                        dataTables = new DataTable[1] { mapping.DataTable };
                    }
                    else
                    {
                        dataTables = DataAdapter.AddDataTableToArray(dataTables, mapping.DataTable);
                    }
                }
            } while (dataReader.NextResult()); // FillSchema does not capture errors for FillError event

            object value = dataTables;
            if ((null == value) && (null == datatable))
            {
                value = Array.Empty<DataTable>();
            }
            return value; // null if datatable had no results
        }