C# Excl(IO流)

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

namespace Reorts.HelpClass
{
    public class Class1
    {
        public DataTable Dat(DataTable dt)
        {
            DataTable Tables = new DataTable();
            Tables.Columns.Add("时间参数");
            for (int i = 0; i 24; i++)
            {
                Tables.Columns.Contains("");
                Tables.Columns.Add(i + ":00");
            }
            foreach (DataRow item in dt.Rows)
            {
                DataRow DR = Tables.NewRow();
                // Tables.Rows.Add
                DR["时间参数"] = new Reorts.Controllers.ReortsController().TAGStr(item["TAG"].ToString());
                for (int i = 0; i 24; i++)
                {
                    DR[i + ":00"] = item[i.ToString()].ToString();
                }
                Tables.Rows.Add(DR);
            }
            return Tables;
        }


        public void ExportExcel(DataTable dt,string ExcelName)
        {
            //设置导出文件路径
            string path = HttpContext.Current.Server.MapPath("Export/");

            //设置新建文件路径及名称
           // string savePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xls";
            string savePath = "C:\\" + ExcelName + ".xls";
            //创建文件
            FileStream file = new FileStream(savePath, FileMode.CreateNew, FileAccess.Write);
          

          


            //以指定的字符编码向指定的流写入字符
            StreamWriter sw = new StreamWriter(file, Encoding.GetEncoding("GB2312"));

            StringBuilder strbu = new StringBuilder();
            strbu.Append("表头");
            strbu.Append(Environment.NewLine);
            strbu.Append("时间"+DateTime.Now.ToString("yyyy年MM月dd日"));
            strbu.Append(Environment.NewLine);
            //写入标题
            for (int i = 0; i )
            {
                strbu.Append(dt.Columns[i].ColumnName.ToString() + "\t");
            }
            //加入换行字符串
            strbu.Append(Environment.NewLine);

            //写入内容
            for (int i = 0; i )
            {
                for (int j = 0; j )
                {
                    strbu.Append(dt.Rows[i][j].ToString() + "\t");
                }
                strbu.Append(Environment.NewLine);
            }

            sw.Write(strbu.ToString());
            sw.Flush();
            file.Flush();

            sw.Close();
            sw.Dispose();

            file.Close();
            file.Dispose();
        }
    }
}