Excel与SQL互导

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
using Excel = Microsoft.Office.Interop.Excel;

namespace ExcelOutputInput
{
    class Program
    {
        static void Main(string[] args)
        {
            string xlspath = @"c:\学生信息.xls";
            string connstr = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Extended Properties=Excel 8.0;" + "data Source=" + xlspath;

            string sql = "select * from [Sheet1$]";
            DataSet ds = new DataSet();
            OleDbConnection conn = new OleDbConnection(connstr);
            conn.Open();
            OleDbCommand cmd = new OleDbCommand(sql, conn);
            OleDbDataAdapter oda = new OleDbDataAdapter(cmd);
            oda.Fill(ds);
            conn.Close();
            foreach (DataRow item in ds.Tables[0].Rows)
            {
                Console.WriteLine(item[0].ToString() + "  " + item[1].ToString() + "　　" + item[2] + "  " + item[3] + "  " + item[4].ToString() + "  " + item[5]);
            }
            Console.WriteLine("请按任意键导出数据到Excel表中……");
            Console.ReadLine();
            DoExcelExport(ds, "xxxxx");
        }

        /// <summary>
        /// 将数据导出到Excel
        /// </summary>
        /// <param name="ds">数据集</param>
        /// <param name="strExcelFileName">导出的文件名</param>
        public static void DoExcelExport(DataSet ds, string strExcelFileName)
        {
            Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();

            excel.Application.Workbooks.Add(true);
            DataTable dt = ds.Tables[0];
            int rowIndex = 1;
            int colIndex = 0;
            foreach (DataColumn col in dt.Columns)
            {
                colIndex++;
                excel.Cells[1, colIndex] = col.ColumnName;
            }
            foreach (DataRow row in dt.Rows)
            {
                rowIndex++;
                colIndex = 0;
                foreach (DataColumn col in dt.Columns)
                {
                    colIndex++;
                    excel.Cells[rowIndex, colIndex] = row[col.ColumnName];

                }

            }
            excel.Visible = true;
            excel = null;
            GC.Collect();
        }
    }
}
//Excel表中的第一行必须自己定义的列名

 /// <summary>  
        /// 将DataTable导出为Excel  
        /// </summary>  
        /// <param name="table">DataTable数据源</param>  
        /// <param name="name">文件名</param>  
        public static void ExportToSpreadsheet(DataTable table, string name)
        {
            Random r = new Random();
            string rf = "";
            for (int j = 0; j < 10; j++)
            {
                rf = r.Next(int.MaxValue).ToString();
            }

            HttpContext context = HttpContext.Current;
            context.Response.Clear();

            context.Response.ContentType = "text/csv";
            context.Response.ContentEncoding = System.Text.Encoding.UTF8;
            context.Response.AppendHeader("Content-Disposition", "attachment; filename=" + name + rf + ".xls");
            context.Response.BinaryWrite(System.Text.Encoding.UTF8.GetPreamble());

            foreach (DataColumn column in table.Columns)
            {
                context.Response.Write(column.ColumnName + ",");
                //context.Response.Write(column.ColumnName + "(" + column.DataType + "),");  
            }

            context.Response.Write(Environment.NewLine);
            double test;

            foreach (DataRow row in table.Rows)
            {
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    switch (table.Columns[i].DataType.ToString())
                    {
                        case "System.String":
                            if (double.TryParse(row[i].ToString(), out test)) context.Response.Write("=");
                            context.Response.Write("\"" + row[i].ToString().Replace("\"", "\"\"") + "\",");
                            break;
                        case "System.DateTime":
                            if (row[i].ToString() != "")
                                context.Response.Write("\"" + ((DateTime)row[i]).ToString("yyyy-MM-dd hh:mm:ss") + "\",");
                            else
                                context.Response.Write("\"" + row[i].ToString().Replace("\"", "\"\"") + "\",");
                            break;
                        default:
                            context.Response.Write("\"" + row[i].ToString().Replace("\"", "\"\"") + "\",");
                            break;
                    }
                }
                context.Response.Write(Environment.NewLine);
            }

            context.Response.End();

        }  

/// <summary> 
        /// dtData是要导出为Excel的DataTable,FileName是要导出的Excel文件名(不加.xls) 
        /// </summary> 
        /// <param name="dtData"></param> 
        /// <param name="FileName"></param> 
        private void DataTable3Excel(System.Data.DataTable dtData, String FileName)
        {
            System.Web.UI.WebControls.GridView dgExport = null;
            //当前对话 
            System.Web.HttpContext curContext = System.Web.HttpContext.Current;
            //IO用于导出并返回excel文件 
            System.IO.StringWriter strWriter = null;
            System.Web.UI.HtmlTextWriter htmlWriter = null;

            if (dtData != null)
            {
                //设置编码和附件格式 
                //System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8)作用是方式中文文件名乱码 
                curContext.Response.AddHeader("content-disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");
                curContext.Response.ContentType = "application nd.ms-excel";
                curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;
                curContext.Response.Charset = "GB2312";

                //导出Excel文件 
                strWriter = new System.IO.StringWriter();
                htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);

                //为了解决dgData中可能进行了分页的情况,需要重新定义一个无分页的GridView 
                dgExport = new System.Web.UI.WebControls.GridView();
                dgExport.DataSource = dtData.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.DataBind();

                //下载到客户端 
                dgExport.RenderControl(htmlWriter);
                curContext.Response.Write(strWriter.ToString());
                curContext.Response.End();
            }
        }