C# Excel导出

  /// <summary>
    /// excel导出
    /// </summary>
    /// <param name="ds">数据集</param>
    /// <param name="typeid">类型，1为导出excel,</param>
    /// <param name="FileName">标题（如果是汉字的话导出显示可能是乱码）</param>
    /// <param name="p">页面</param>
    /// <param name="DbName">数据库字段名</param>
    /// <param name="DisplayName">显示名称</param>
    public static void CreateExcels(DataSet ds, string typeid, string FileName, Page p, string[] DbName, string[] DisplayName)//导出Excel方法
    {
        HttpResponse resp;
        resp = p.Response;
        resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName+".xls");//这个地方折磨了我直接加了扩展名酒可以了
        string colHeaders = "", ls_item = "";
        int i = 0;

        //定义表对象和行对像，同时用DataSet对其值进行初始化
        DataTable dt = ds.Tables[0];
        DataRow[] myRow = dt.Select("");
        // typeid=="1"时导出为EXCEL格式文档；typeid=="2"时导出为XML格式文档
        if (typeid == "1")
        {
            //取得数据表各列标题，各标题之间以/t分割，最后一个列标题后加回车符
            for (i = 0; i < dt.Columns.Count; i++)
            {
                if (i == dt.Columns.Count - 1)
                {
                    colHeaders += dt.Columns[i].Caption.ToString().Replace(DbName[i], DisplayName[i]) + "/n";
                }
                else
                {
                    colHeaders += dt.Columns[i].Caption.ToString().Replace(DbName[i], DisplayName[i]) + "/t";
                }
            }
            //向HTTP输出流中写入取得的数据信息
            resp.Write(colHeaders);
            //逐行处理数据
            foreach (DataRow row in myRow)
            {
                //在当前行中，逐列获得数据，数据之间以/t分割，结束时加回车符/n
                for (i = 0; i < dt.Columns.Count; i++)
                {

                    if (i == dt.Columns.Count - 1)
                    {
                        ls_item += row[i].ToString() + "/n";
                    }
                    else
                    {
                        ls_item += row[i].ToString() + "/t";
                    }
                }
                //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据
                resp.Write(ls_item);
                ls_item = "";
            }
        }
        else
        {
            if (typeid == "2")
            {
                //从DataSet中直接导出XML数据并且写到HTTP输出流中
                resp.Write(ds.GetXml());
            }
        }
        //写缓冲区中的数据到HTTP头文档中
        resp.End();
    }