整理C# 读取文件Scv格式代码

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　　　　 #region Scv格式文件读取和生成
        /// <summary>
        /// 对读取到的cvs单独一行内容进行处理，去掉Csv格式，返回常规字符串，每项之间用特殊字符“^”隔开
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        private static string DealCode(string str)
        {
            string s = "";
            int k = 1;
            if (str.Length == 0) return "";
            str = str.Replace("^", "");
            for (int i = 0; i < str.Length; i++)
            {
                switch (str.Substring(i, 1))
                {
                    case "\"":
                        s += str.Substring(i, 1);
                        k++;
                        break;
                    case ",":
                        if (k % 2 == 0)
                            s += str.Substring(i, 1);
                        else
                            s += "^";
                        break;
                    default: s += str.Substring(i, 1); break;
                }
            }
            return s;
        }
        /// <summary>
        /// 对单引号和双引号处理
        /// </summary>
        /// <param name="tmp"></param>
        /// <returns></returns>
        private static string[] DealCode2(string[] tmp)
        {
            string[] tmps = new string[tmp.Length];
            for (int i = 0; i < tmp.Length; i++)
            {
                string temp = tmp[i].Replace("\"\"", "^");
                temp = temp.Replace("\"", "");
                temp = temp.Replace("^", "\"");
                temp = temp.Replace("''", "∵");
                temp = temp.Replace("∵", "'");
                tmps[i] = temp;
            }
            return tmps;
        }
        /// <summary>
        /// 获取Scv文件
        /// </summary>
        /// <param name="reader">System.IO.StreamReader流</param>
        /// <returns>返回List<string[]>数组</returns>
        public static List<string[]> GetScv(System.IO.StreamReader reader)
        {
            List<string[]> list = new List<string[]>();
            string strline="";
            while ((strline = reader.ReadLine()) != null)//每次单独抽取Csv一行的内容来处理
            {
                strline = DealCode(strline).Replace("'", "''");//调用函数处理每一行内容
                string[] strs = strline.Split(new char[] { '^' });//对处理后的内容进行特殊字符“^”分隔就得到了常规的字符数组了，你就可以进行其他用途了。
                strs = DealCode2(strs);
                list.Add(strs);
            }
            return list;
        }
        //输出Csv格式数据
        /// <summary>
        /// 输出Csv格式文件
        /// </summary>
        /// <param name="dt"></param>
        public static void CreateCsv(DataTable dt)
        {
            StringWriter sw = new StringWriter();
            string column = "";
            foreach (DataColumn item in dt.Columns)
            {
                column += item + ",";
            }
            column = column.Trim(',');
            sw.WriteLine(column);//添加行s

            foreach (DataRow row in dt.Rows)
            {
                string rows = "";
                foreach (DataColumn col in dt.Columns)
                {
                    rows += row[col] + ",";//添加列
                }
                rows = rows.Trim(',');
                sw.WriteLine(rows);
            }
            sw.Close();
            System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=DomeCsv" + DateTime.Now.ToShortTimeString() + ".csv");
            System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";
            System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            System.Web.HttpContext.Current.Response.Write(sw);
            System.Web.HttpContext.Current.Response.End();
        }
        #endregion