将制定内容输出为压缩后的xls文件

在项目中，我们常常有一些需求，要将一些数据输出为excel文件格式，通常我们不会去调用VSTO的dll，而是采用以下的简单代码，请看以下代码
1.最简单的，一般用于小数据量，列比较少的情况

LogManager caseLogMG  =   new  LogManager();
            List < OperationStatEn >  lstItem  =  caseLogMG.GetOperationStat(BeginDate, EndDate);

             if  (lstItem.Count  >   0 )
            {
                StringWriter sw  =   new  StringWriter();
                sw.WriteLine( " 操作类型\t操作次数 " );

                 foreach  (OperationStatEn item  in  lstItem)
                {
                    sw.WriteLine(item.Message.Trim()  +   " \t "   +  item.Quantity);
                }

                sw.Close();
                Response.Clear();
                Response.AddHeader( " Content-Disposition " ,  " attachment; filename=OperateStat.xls " );
                Response.ContentType  =   " application/ms-excel " ;
                Response.ContentEncoding  =  System.Text.Encoding.GetEncoding( " GB2312 " );
                Response.Write(sw);
                Response.End();

            }

嗯，很简单，单元格之间用"\t"空开。

2.通常的做法，对列和数据量无限制，当然，数据量和列不能超过xls文件自身的限制

         ///   <summary>
         ///  导出到xls文件
         ///   </summary>
         ///   <param name="lisItems"></param>
         private   void  ExportXls(List < DSCardRecoveryEn >  lisItems)
        {
             if  (lisItems.Count  ==   0 )
            {
                 return ;
            }

            StringWriter sw  =   new  StringWriter();
            sw.WriteLine( " <meta http-equiv=\ " content - type\ "  content=\ " application / ms - excel; charset = GB2312\ " /> " );
            sw.WriteLine( " <div> " );
            sw.WriteLine( " <table border='1'> " );
            sw.WriteLine( " <tr> " );
            sw.WriteLine( " <th style='vnd.ms-excel.numberformat:@'>编号</th><th>姓名</th><th style='vnd.ms-excel.numberformat:@'>证件序列号</th><th>处理结果</th><th>回收方式</th><th>提货点编号</th><th>起始时间</th><th>最后修改时间</th> " );
            sw.WriteLine( " </tr> " );

             foreach  (DSCardRecoveryEn item  in  lisItems)
            {
                sw.WriteLine( " <tr> " );
                sw.WriteLine( " <td style='vnd.ms-excel.numberformat:@'> "   +  item.DsId.Trim()
                     +   " </td><td> "   +  item.ConsultantName.Trim()
                     +   " </td><td style='vnd.ms-excel.numberformat:@'> "   +  item.DsCardId.Trim()
                     +   " </td><td> "   +  StringHelper.ShowState(item.State).Trim()
                     +   " </td><td> "   +  StringHelper.ShowRecoveryType(item.RecoveryType).Trim()
                     +   " </td><td> "   +  StringHelper.ShowOPP(item.OppId).Trim()
                     +   " </td><td> "   +  StringHelper.ToStantardDateTime(item.CreateDate)
                     +   " </td><td> "   +  StringHelper.ToStantardDateTime(item.LastEditDate)  +   " </td> " );
                sw.WriteLine( " </tr> " );
            }
            sw.WriteLine( " </table> " );
            sw.WriteLine( " </div> " );

            sw.Close();

            Response.Clear();
            Response.AddHeader( " Content-Disposition " ,  " attachment; filename=ListInfo.xls " );
            Response.ContentType  =   " application/ms-excel " ;
            Response.ContentEncoding  =  System.Text.Encoding.GetEncoding( " GB2312 " );
            Response.Write(sw);
            Response.End();
        }

也比较简单，就是当做一个html页输出了，记得，顶头的 sw.WriteLine( " <meta http-equiv=\ " content - type\ "  content=\ " application / ms - excel; charset = GB2312\ " /> " );一定要有，不然可能会出现乱码问题。

3.如果数据量比较大，也可以先将xls文件压缩成zip后再输出给用户

         protected   void  btnExportOperationDetail_Click( object  sender, EventArgs e)
        {
             try
            {
                 string  uniqueTag  =  Guid.NewGuid().ToString();
                ID5CaseLogManager caseLogMG  =   new  ID5CaseLogManager();
                List < ID5CaseLogEn >  lstItem  =  caseLogMG.GetCaseIdByDate(BeginDate, EndDate);

                 if  (lstItem.Count  !=   0 )
                {
                     string  path  =  Server.MapPath( " Upload/ " );
                     if  ( ! Directory.Exists(path))
                    {
                        Directory.CreateDirectory(path);
                    }

                     string  zipedpath  =  path  +  uniqueTag  +   " .zip " ;

                     if  ( ! File.Exists(zipedpath))
                    {
                        SaveDataTableAsFile(path  +  uniqueTag  +   " .xls " , lstItem);
                         string [] pathArray  =  {path  +  uniqueTag  +   " .xls " };
                        Function.ZipFile(pathArray, zipedpath,  3 ,  3 );

                        File.Delete(path  +  uniqueTag  +   " .xls " );
                    }

                    Response.Clear();
                    Response.AppendHeader( " Content-Disposition " ,
                                           " attachment; filename= "   +
                                          HttpUtility.UrlEncode(uniqueTag  +   " .zip " ,
                                                                System.Text.Encoding.GetEncoding( " GB2312 " )));
                    Response.WriteFile(zipedpath);
                    Response.Flush();
                    File.Delete(zipedpath);
                    Response.End();
                }
            }
             catch (Exception ex)
            {
                Response.Write(ex.ToString());
            }
        }

///   <summary>
         ///  
         ///   </summary>
         ///   <param name="path"></param>
         ///   <param name="lstItem"></param>
         private   void  SaveDataTableAsFile( string  path, List < CaseLogEn >  lstItem)
        {
            StringWriter sw  =   new  StringWriter();
            sw.WriteLine( " <meta http-equiv=\ " content - type\ "  content=\ " application / ms - excel; charset = GB2312\ " /> " );
            sw.WriteLine( " <div> " );
            sw.WriteLine( " <table border='1'> " );
            sw.WriteLine( " <tr> " );
            sw.WriteLine( " <th style='vnd.ms-excel.numberformat:@'>Id</th><th>处理结果</th><th>备注</th><th  style='vnd.ms-excel.numberformat:@'>编号</th><th  style='vnd.ms-excel.numberformat:@'>经销商编号</th><th>log创建日期</th><th>log创建人</th> " );
            sw.WriteLine( " </tr> " );
             foreach  (CaseLogEn item  in  lstItem)
            {
                 string  createDate;
                 try
                { createDate  =  item.Createdate.Value.ToString( " yyyy-MM-dd HH:mm:ss " ); }
                 catch
                { createDate  =   string .Empty; }

                sw.WriteLine( " <tr> " );
                sw.WriteLine( " <td style='vnd.ms-excel.numberformat:@'> "   +  item.Id
                     +   " </td><td > "   +  item.Message.Trim()
                     +   " </td><td > "   +  item.Note.Trim()
                     +   " </td><td style='vnd.ms-excel.numberformat:@'> "   +  item.DirectSellerID.Trim()
                     +   " </td><td style='vnd.ms-excel.numberformat:@'> "   +  item.DirId.Trim()
                     +   " </td><td > "   +  createDate
                     +   " </td><td > "   +  item.Editby.Trim()  +   " </td> " );
                sw.WriteLine( " </tr> " );
            }
            sw.WriteLine( " </table> " );
            sw.WriteLine( " </div> " );

            sw.Close();

             if  (File.Exists(path))
            {
                File.Delete(path);
            }

             byte [] textByte  =  System.Text.Encoding.GetEncoding( " GB2312 " ).GetBytes(sw.ToString());

            FileStream fileStream  =  File.Create(path);
            fileStream.Write(textByte,  0 , textByte.Length);
            fileStream.Close();
        }