DataTable 更改在有数据列的类型方法

原文:DataTable 更改在有数据列的类型方法

 /// <summary>
        /// 修改数据表DataTable某一列的类型和记录值(正确步骤：1.克隆表结构，2.修改列类型，3.修改记录值，4.返回希望的结果)
        /// </summary>
        /// <param name="argDataTable">数据表DataTable</param>
        /// <returns>数据表DataTable</returns>  

        private DataTable UpdateDataTable(DataTable argDataTable)
        {
            DataTable dtResult = new DataTable();
            //克隆表结构
            dtResult = argDataTable.Clone();
            foreach (DataColumn col in dtResult.Columns)
            {
                if (col.ColumnName == "testColumn")
                {
                    //修改列类型
                    col.DataType = typeof(DateTime);
                }
            }
            foreach (DataRow row in argDataTable.Rows)
            {
                DataRow newDtRow = dtResult.NewRow();
                foreach (DataColumn column in argDataTable.Columns)
                {
                    if (column.ColumnName == "testColumn")
                    {
                        newDtRow[column.ColumnName] = Convert.ToDateTime(row[column.ColumnName]);
                    }
                    else
                    {
                        newDtRow[column.ColumnName] = row[column.ColumnName];
                    }
                }
                dtResult.Rows.Add(newDtRow);
            }
            return dtResult;
        }