1. 程式人生 > >datarow[]轉換成datatable

datarow[]轉換成datatable

DataTable dt;//不為空的DataTable

DataRow[] rows=dt.Select(" c_user_name ='123456' ");//獲取datarow[]型別

現需要將查詢出來的datarow[]型別再次轉換為DataTable時,可以用到下面方法:

/// <summary>

        /// datarow[]轉換成datatable

        /// </summary>

        ///

<param name="rows"></param>

        /// <returns></returns>

        public DataTable ToDataTable(DataRow[] rows)

        {

            if

(rows == null || rows.Length == 0) return null;

            DataTable tmp = rows[0].Table.Clone();  // 複製DataRow的表結構  

            foreach (DataRow row in rows)

            {

                tmp.Rows.Add(row.ItemArray);  // 將DataRow新增到DataTable中 

            }

            return tmp;

        }

 

把一個表的DataRow[]轉換為另外的datatable(小技巧)

DataTable dt1 = new DataTable();
        dt1.Columns.Add("a");
        for (int i = 0; i < 10; i++)
        {
            DataRow dr1 = dt1.NewRow();
            dr1["a"] = "1";
            dt1.Rows.Add(dr1);
        }

        DataRow[] drw = dt1.Select("a =" + "1");
        DataTable dt2 = new DataTable();
        dt2 = dt1.Clone();
        foreach (DataRow Drr in drw)
        {
            DataRow dr2 = dt2.NewRow();//
如果在此直接用dt2.Rows.Add(Drr)會報錯,因為Drr的引用現在為dt1所用
            dr2.ItemArray = Drr.ItemArray;
            dt2.Rows.Add(dr2);
        }