using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;

namespace CnasSynchronusDAL
{
    public class FoxProSpecialDtMethod
    {
        /// <summary>
        /// 模拟SQL中函数comcat(A,B,C) as D
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="strParams"></param>
        /// <returns></returns>
        public static DataTable FoxProSpecialDtMethodForComcat(DataTable dt,string strParams)
        {
            string[] strParamsItems = strParams.Split(new string[] { "{", "}" }, StringSplitOptions.RemoveEmptyEntries);
            if (strParamsItems.Length == 2)
            {
                dt.Columns.Add(strParamsItems[1]);  //增加新列
                string[] strColumns = strParamsItems[0].Split(',');  //获取准备合并的列
                if (strColumns.Length > 0)
                {
                    foreach (DataRow dr in dt.Rows)
                    {
                        foreach (string columnitem in strColumns)
                        {
                            if (dt.Columns.Contains(columnitem))
                                dr[strParamsItems[1]] = dr[strParamsItems[1]].ToString() + dr[columnitem].ToString();
                        }
                    }
                }
            }
            return dt;
        }
    }
}