原文:

/// 
        /// 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)        /// 
        /// 数据表DataTable        /// 
     
      数据表DataTable
     

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;        }