C#使用NPOI導出Excel

NPOI能夠在沒有安裝Office的狀況下對Word或Excel文檔進行讀寫操做

下面介紹下NPOI操做Excel的方法

首先咱們須要下載NPOI的程序集 

下載地址 http://npoi.codeplex.com/releases

我下載下來是有這兩個文件

這裏使用的是net4.0

將下面幾個dll添加到項目中並引用

 

廢話很少說  上代碼

        /// <summary>
        /// create 2016-11-30 by sly 
        /// 將DataTable數據導入到excel中   此方法直接返回文件給瀏覽器下載
        /// </summary>
        /// <param name="data">要導入的數據</param>
        /// <param name="isColumnWritten">DataTable的列名是否要導入</param>
        /// <param name="sheetName">要導入的excel的sheet的名稱</param>
        /// <param name="widthDic">要設置的寬度(key 列下標,val 寬度大小)</param>
        /// <returns></returns>
        public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten, Dictionary<int, int> widthDic = null)
        {
            int i = 0;
            int j = 0;
            int count = 0;
            ISheet sheet = null;

            MemoryStream file = new MemoryStream();

            if (fileName.IndexOf(".xlsx") > 0) //2007版本
                workbook = new XSSFWorkbook();
            else
                if (fileName.IndexOf(".xls") > 0) // 2003版本
                workbook = new HSSFWorkbook();

            try
            {
                if (workbook != null)
                {
                    sheet = workbook.CreateSheet(sheetName);

                    //設置全部列寬
                    for (int l = 0; l <= data.Rows.Count; l++)
                    {
                        sheet.DefaultColumnWidth = 12;
                    }

                    if (widthDic != null)
                    {
                        //設定自定義寬度
                        foreach (var item in widthDic)
                        {
                            sheet.SetColumnWidth(item.Key, item.Value);
                        }
                    }
                }
                else
                {
                    return -1;
                }

                if (isColumnWritten == true) //寫入DataTable的列名
                {
                    IRow row = sheet.CreateRow(0);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
                    }
                    count = 1;
                }
                else
                {
                    count = 0;
                }
                int outRes = -1;

                for (i = 0; i < data.Rows.Count; ++i)
                {
                    IRow row = sheet.CreateRow(count);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        if (int.TryParse(data.Rows[i][j].ToString(), out outRes))
                        {
                            row.CreateCell(j).SetCellValue(Convert.ToInt32(data.Rows[i][j].ToString()));
                        }
                        else
                        {
                            if (!string.IsNullOrEmpty(data.Rows[i][j].ToString()) && data.Rows[i][j].ToString().Length > 10)
                            {
                                if ((data.Rows[i][j].ToString().Substring(0, 7) == "http://" || data.Rows[i][j].ToString().Substring(0, 8) == "https://"))
                                {
                                    var TCell = row.CreateCell(j);
                                    HSSFHyperlink link = new HSSFHyperlink(HyperlinkType.Url);//建一個HSSFHyperlink實體，指明連接類型爲URL  
                                    TCell.SetCellValue(data.Rows[i][j].ToString());
                                    link.Address = data.Rows[i][j].ToString();//給HSSFHyperlink的地址賦值                                                                      
                                    TCell.Hyperlink = link;
                                }
                                else
                                {
                                    row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
                                }
                            }
                            else
                            {
                                row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
                            }
                        }
                    }
                    ++count;
                }
                workbook.Write(file); //寫入到excel

                var context = System.Web.HttpContext.Current;
                context.Response.ContentType = "application/vnd.ms-excel";
                context.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", fileName));
                context.Response.Clear();
                context.Response.BinaryWrite(file.GetBuffer());
                context.Response.End();


                return count;
            }
            catch (Exception ex)
            {
                return -2;
            }
        }

 

        /// <summary>        
        /// 將excel中的數據導入到DataTable中
        /// </summary>
        /// <param name="sheetName">excel工做薄sheet的名稱</param>
        /// <param name="isFirstRowColumn">第一行是不是DataTable的列名</param>
        /// <returns></returns>
        public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
        {
            ISheet sheet = null;
            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                    workbook = new XSSFWorkbook(fs);
                else
                    if (fileName.IndexOf(".xls") > 0) // 2003版本
                    workbook = new HSSFWorkbook(fs);

                if (sheetName != null)
                {
                    sheet = workbook.GetSheet(sheetName);
                    if (sheet == null) //若是沒有找到指定的sheetName對應的sheet，則嘗試獲取第一個sheet
                    {
                        sheet = workbook.GetSheetAt(0);
                    }
                }
                else
                {
                    sheet = workbook.GetSheetAt(0);
                }
                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(0);
                    int cellCount = firstRow.LastCellNum; //一行最後一個cell的編號 即總的列數

                    if (isFirstRowColumn)
                    {
                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                        {
                            ICell cell = firstRow.GetCell(i);
                            if (cell != null)
                            {
                                string cellValue = cell.StringCellValue;
                                if (cellValue != null)
                                {
                                    DataColumn column = new DataColumn(cellValue);
                                    data.Columns.Add(column);
                                }
                            }
                        }
                        startRow = sheet.FirstRowNum + 1;
                    }
                    else
                    {
                        startRow = sheet.FirstRowNum;
                    }

                    //最後一列的標號
                    int rowCount = sheet.LastRowNum;
                    for (int i = startRow; i <= rowCount; ++i)
                    {
                        IRow row = sheet.GetRow(i);
                        if (row == null) continue; //沒有數據的行默認是null　　　　　　　

                        DataRow dataRow = data.NewRow();
                        for (int j = row.FirstCellNum; j < cellCount; ++j)
                        {
                            if (row.GetCell(j) != null) //同理，沒有數據的單元格都默認是null
                                dataRow[j] = row.GetCell(j).ToString();
                        }
                        data.Rows.Add(dataRow);
                    }
                }

                return data;
            }
            catch (Exception ex)
            {                
                return null;
            }
        }

 

        /// <summary>
        /// 合併單元格
        /// </summary>
        /// <param name="sheet">要合併單元格所在的sheet</param>
        /// <param name="rowstart">開始行的索引</param>
        /// <param name="rowend">結束行的索引</param>
        /// <param name="colstart">開始列的索引</param>
        /// <param name="colend">結束列的索引</param>
        public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend)
        {
            CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);
            sheet.AddMergedRegion(cellRangeAddress);
        }

 

            //調用導出方法
            new Helper.ExcelHelper("導出的文件名.xls").DataTableToExcel(dt, "sheet1", true, null);
            new Helper.ExcelHelper("導出的文件名.xlsx").DataTableToExcel(dt, "sheet1", true, null);

 

下面是導入

<input type="file" name="fileField" class="file" id="fileField" value="導入" style="display: none;" />
<script>
    $("#fileField").live("change", function () {
        var Reg = new RegExp("^.+\.(xls)");
        var Reg2 = new RegExp("^.+\.(xlsx)");
        if (Reg.test($(this).val()) || Reg.test2($(this).val())) {
            ImportGrade();//此處調用後臺導入方法，這裏就不寫了哈
        } else {
            $.IvanDialogOpen({ "Type": "tips", "Info": "僅支持 .xls ，.xlsx 文件", "Plugins": { CloseTime: 800 } });
        }
    })
</script>

        /// <summary>
        /// 導入Demo
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public ActionResult ImportGrade(string filePath)
        {
            //獲取文件在服務器上的路徑
            string path = string.Concat(FileUpload.GetFilePath(UploadType.ImportGradeFile), filePath);
            //根據上傳路徑獲取表格數據
            ExcelHelper eh = new ExcelHelper(path.Replace("\\", "/"));

            DataTable dt = eh.ExcelToDataTable("Sheet1", true);

            return Content("");
        }

 

 以上就是NPOI的簡單使用方法