DataTable列修改

 /// <summary>
    /// 修改datatable列
    /// </summary>
    /// <param name="argDataTable"></param>
    /// <param name="newid"></param>
    /// <returns></returns>
    private DataTable UpdateDataTableEvaluation(DataTable argDataTable, string newid)
    {
        DataTable dtResult = new DataTable();
        //克隆表结构
        dtResult = argDataTable.Clone();

        foreach (DataColumn col in dtResult.Columns)
        {
            if (col.ColumnName == "age")
            {
                //修改列类型
                col.DataType = typeof(String);
            }
        }
        foreach (DataRow row in argDataTable.Rows)
        {
            DataRow rowNew = dtResult.NewRow();
            rowNew["Id"] = row["Id"];
            rowNew["Evaluation"] = row["Evaluation"];
            rowNew["Careergoal"] = row["Careergoal"];
            rowNew["ResumeId"] = newid;
            dtResult.Rows.Add(rowNew);
        }
        //返回
        return dtResult;
    }