用NPOI完成公司任務（主要就是導入導出操做）

注意要先添加程序集的引用

導出到excel:

   

    public override IWorkbook writeExecl(string filePath, DataTable dt) { if (File.Exists(filePath)) { File.Delete(filePath); } IWorkbook wk = new XSSFWorkbook(); ; //建立一個名稱爲data的表
            ISheet tb = wk.CreateSheet("data"); //表頭
            IRow row1 = tb.CreateRow(0); int k = 0; foreach (DataColumn dc in dt.Columns) { ICell cell1 = row1.CreateCell(k); cell1.SetCellValue(getChinaName(dc.ColumnName)); k = k + 1; } //表體
            for (int i = 0; i < dt.Rows.Count; i++) { IRow row = tb.CreateRow(i + 1); for (int j = 0; j < dt.Columns.Count; j++) { if (j == 3) { ICell cell = row.CreateCell(j); string value = dt.Rows[i][j].ToString(); cell.SetCellValue(tranSchoolType(value)); } else { ICell cell = row.CreateCell(j); string value = dt.Rows[i][j].ToString(); cell.SetCellValue(value); } } } string uploadPath = HttpContext.Current.Server.MapPath(filePath); //打開一個xls文件，若是沒有則自行建立 //若是存在myxls.xls文件則在建立是不要打開該文件！
            using (FileStream fs = File.OpenWrite(uploadPath)) { //向打開的這個xls文件中寫入mySheet表並保存。
 wk.Write(fs); } }

 

是用excel2003仍是excel2007能夠用下面這個方法：

      

 static IWorkbook isExcelType(string filePath) { IWorkbook wk = null; FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite); if (filePath.IndexOf(".xlsx") > 0) // 2007版本
                wk = new XSSFWorkbook(fs); else if (filePath.IndexOf(".xls") > 0) // 2003版本
                wk = new HSSFWorkbook(fs); fs.Close(); return wk; }

 

 

從excel讀取數據：

 

   List<Dictionary<string, string>> readExcel(string filePath) { IWorkbook wk = null; wk = isExcelType(filePath); ISheet sheet = wk.GetSheetAt(0); List<string> names = new List<string>();//LastRowNum 是當前表的總行數

            for (int j = 1; j <= sheet.LastRowNum; j++) 
            {  for (int j = 1; j <= sheet.LastRowNum; j++) 
            {

                 //讀取當前行數據
                IRow row = sheet.GetRow(j); 
                if (row != null)
                {
                      //LastCellNum 是當前行的總列數
                    for (int k = 0; k <= row.LastCellNum; k++) 
                    {

 

                          //當前表格
                        ICell cell = row.GetCell(k); 
                        if (cell != null)
                        {
                            string name = cell.ToString();  
                            names.Add(name);
                        }
                    }
                }
            }
            List<Dictionary<string, string>> lists = new List<Dictionary<string, string>>();
            return lists;
        }

 

 

好了，以上就簡單的完成導入導出了！