C#导出excel

方式一,AppLibrary.WriteExcel.XlsDocument:

　　所用的库及库源码为:AppLibrary.WriteExcel.XlsDocument,这种方式默认是以excel2003的方式输出(即使机子上只安装office2010),而excel2003最多允许65536行,适合输出比较小的数据量.例如:

 1 /// <summary>

 2     /// 通过"AppLibrary.WriteExcel.XlsDocument",以.xls方式输出.

 3     /// </summary>

 4     public void WriteAsXLS() {

 5         AppLibrary.WriteExcel.XlsDocument doc = new AppLibrary.WriteExcel.XlsDocument();

 6         doc.FileName = "Report.xls";

 7 

 8         //获得数据库前30条记录.

 9         var data = GetTopRecords(30).ToArray<t_review>();

10         const int sheetMaxRecord = 10;  //每个sheet最多的行数.

11         int curRow = 2; //开始游标.

12 

13         int sheetNum = 1;   //sheet序号.

14         AppLibrary.WriteExcel.Worksheet sheet = null;

15 

16         for (int s = 0; s < data.Length; s++) {

17             if (s % sheetMaxRecord == 0) {

18                 sheet = doc.Workbook.Worksheets.Add("sheet-" + sheetNum++);

19                 AddHead(sheet);

20 

21                 curRow = 2;

22             }

23             AppLibrary.WriteExcel.Cells cells = sheet.Cells;

24 

25             cells.Add(curRow, 1, data[s].votes);

26             cells.Add(curRow, 2, data[s].user_id);

27             cells.Add(curRow, 3, data[s].review_id);

28             cells.Add(curRow, 4, data[s].stars);

29             cells.Add(curRow, 5, data[s].date);

30             cells.Add(curRow, 6, data[s].text);

31             cells.Add(curRow, 7, data[s].type);

32             cells.Add(curRow, 8, data[s].business_id);

33 

34             curRow++;

35         }

36         doc.Send();

37         Response.Flush();

38         Response.End();

39     }

获得记录的GetTopRecords方法为:

1 IQueryable<t_review> GetTopRecords(int topNum) {

2         ReviewDataContext re = new ReviewDataContext();

3         return (from r in re.t_reviews

4                 select r).Take<t_review>(topNum);

5     }

 通过这种方式,处理大型数据的时候,容易抛出 System.OutOfMemoryException 异常,例如,我的数据库量为 一百多万条,就不能使用这种方式,即使产生多个sheet,例如:

 1 public void WriteAsXLS() {

 2         AppLibrary.WriteExcel.XlsDocument doc = new AppLibrary.WriteExcel.XlsDocument();

 3         doc.FileName = "Report.xls";

 4 

 5         ReviewDataContext re = new ReviewDataContext();

 6         var data = from r in re.t_reviews

 7                    select r;

 8         const int sheetMaxRecord = 60000;   //每个sheet最多的行数.

 9         int curRecord = 0; //实际记录号.

10         int curRow = 2; //当前待写入sheet中的行号.

11         

12         int sheetNum = 1;   //sheet序号.

13         AppLibrary.WriteExcel.Worksheet sheet = null;

14         

15         foreach (var r in data) {

16             if (curRecord % sheetMaxRecord == 0) {

17                 sheet = doc.Workbook.Worksheets.Add("sheet-" + sheetNum++);

18                 AddHead(sheet);

19 

20                 curRow = 2;

21             }

22             AppLibrary.WriteExcel.Cells cells = sheet.Cells;

23 

24             cells.Add(curRow, 1, r.votes);

25             cells.Add(curRow, 2, r.user_id);

26             cells.Add(curRow, 3, r.review_id);

27             cells.Add(curRow, 4, r.stars);

28             cells.Add(curRow, 5, r.date);

29             cells.Add(curRow, 6, r.text);

30             cells.Add(curRow, 7, r.type);

31             cells.Add(curRow, 8, r.business_id);

32 

33             curRecord++;

34         }

35         doc.Send();

36         Response.Flush();

37         Response.End();

38     }