dataReader转换成Datatable,中间还有数据的类型

/// <summary>
        /// 用于把dataReader转换成DataTable
        /// </summary>
        /// <param name="dataReader"></param>
        /// <returns></returns>
        public DataTable DataReaderToDataTable(DbDataReader dataReader)
        {
            DataTable datatable = new DataTable();
            DataTable schemaTable = dataReader.GetSchemaTable();

            try
            {
                foreach (DataRow myRow in schemaTable.Rows)
                {
                    DataColumn myDataColumn = new DataColumn(myRow[0].ToString(),System.Type.GetType(myRow["DataType"].ToString()));
                    datatable.Columns.Add(myDataColumn);
                }

                while (dataReader.Read())
                {
                    DataRow myDataRow = datatable.NewRow();

                    for (int i = 0; i < schemaTable.Rows.Count; i++)
                    {
                        myDataRow[i] = dataReader[i];
                    }
                    datatable.Rows.Add(myDataRow);
                    myDataRow = null;
                }
                schemaTable = null;
                dataReader.Close();
                return datatable;
            }
            catch (Exception ex)
            {
                throw new Exception("error", ex);
            }
        }