最近在做 MVC 項目的時候遇到項目的導出，下面總結(jié)下兩種導出到excel 的方法

第一種方法：?將文件寫到本地，然后返回這個File 或者返回這個 File 的絕對地址

　　?其中? _hostingEnvironment? 可以在全局讀取的配置文件的工具類 Globals 中配置

?　　直接上代碼：

private IHostingEnvironment _hostingEnvironment;public XlsxController(IHostingEnvironment hostingEnvironment){_hostingEnvironment = hostingEnvironment;}public IActionResult ExportData(int programmeId){//獲取方案名稱var programmeName = ProgrammeService.GetProgrammeNameById(programmeId);//獲取列表內(nèi)容var dataFromDb = ProgrammeService.GetProgrammeStatisticEnrolmentExportList(programmeId);var data = dataFromDb.Select(a => new ProgrammeStatisticsEnrolmentDetailsExportViewModel{UserName = a.UserName,Phone = a.Phone,EnrolTime = a.EnrolTimeStr}).ToList();var sWebRootFolder = _hostingEnvironment.WebRootPath;var sFileName = $"XXX-{programmeName}.xlsx";var file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));using (var package = new ExcelPackage(file)){//如果之前有同名的文件先刪除然后重新創(chuàng)建 var count = package.Workbook.Worksheets.Count; if (count > 0){for (var i = 0; i < count; i++){package.Workbook.Worksheets.Delete(i + 1);}package.File.Delete();}// 添加worksheet ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Sheet1");//添加頭 worksheet.Cells[1, 1].Value = "姓名";worksheet.Cells[1, 2].Value = "手機號";worksheet.Cells[1, 3].Value = "報名時間";//添加值 for (var i = 0; i < data.Count; i++){worksheet.Cells[$"A{i + 2}"].Value = data[i].UserName;worksheet.Cells[$"B{i + 2}"].Value = data[i].Phone;worksheet.Cells[$"C{i + 2}"].Value = data[i].EnrolTime;}package.Save();}var returnFile = File(sFileName, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");returnFile.FileDownloadName = sFileName;return returnFile;}

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第二種方法： 用寫流文件的方法 將文件寫入瀏覽器

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　　這里首先我們需要一個導出的工具類 如下：

/// <summary>/// 公共工具類/// </summary>public class CommonHelper{//獲取列名委托方法public delegate string GetColumnName(string columnName);#region 導入導出Excel相關(guān)/// <summary>/// 將泛類型集合List類轉(zhuǎn)換成DataTable/// </summary>/// <param name="list">泛類型集合</param>/// <returns>返回轉(zhuǎn)換后的DataTable</returns>public static DataTable ListToDataTable<T>(List<T> entitys){//生成DataTable的structurevar dt = new DataTable();try{//檢查泛型實體是否為空if (entitys == null || entitys.Count < 1){return dt;}//取出第一個實體的所有Propertievar entityType = entitys[0].GetType();var entityProperties = entityType.GetProperties();for (var i = 0; i < entityProperties.Length; i++){dt.Columns.Add(entityProperties[i].Name);}//將所有entity添加到DataTable中foreach (object entity in entitys){//檢查所有的的實體都為同一類型if (entity.GetType() != entityType){throw new Exception("要轉(zhuǎn)換的集合元素類型不一致");}var entityValues = new object[entityProperties.Length];for (var i = 0; i < entityProperties.Length; i++){entityValues[i] = entityProperties[i].GetValue(entity, null);}dt.Rows.Add(entityValues);}}catch (Exception e){Console.WriteLine(e);}return dt;}/// <summary>/// 將dataTable轉(zhuǎn)換為Excel字節(jié)流/// </summary>/// <param name="dt"></param>/// <param name="getColumnName"></param>/// <returns></returns>public static byte[] GetExcelForXLSX(DataTable dt, GetColumnName getColumnName){var xssfworkbook = new XSSFWorkbook();var sheet = xssfworkbook.CreateSheet("Sheet");//表頭var row = sheet.CreateRow(0);for (var i = 0; i < dt.Columns.Count; i++){var cell = row.CreateCell(i);//列名稱,數(shù)據(jù)庫中字段var columnName = dt.Columns[i].ColumnName;var convertColumnName = getColumnName(columnName);cell.SetCellValue(convertColumnName);}//數(shù)據(jù)for (var i = 0; i < dt.Rows.Count; i++){var row1 = sheet.CreateRow(i + 1);for (var j = 0; j < dt.Columns.Count; j++){var cell = row1.CreateCell(j);cell.SetCellValue(dt.Rows[i][j].ToString());}}//轉(zhuǎn)為字節(jié)數(shù)組var stream = new MemoryStream();xssfworkbook.Write(stream);var buf = stream.ToArray();return buf;}#endregion}

　　

　　然后我們就可以導出了

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　　　　/// <summary>/// 表格列名稱/// </summary> private static string GetColumnNameForDetail(string columnName){switch (columnName){case "UserName":return CommonConst.Column_Programme_Detail_UserName;case "Phone":return CommonConst.Column_Programme_Detail_Phone;case "EnrolTime":return CommonConst.Column_Programme_Detail_EnrolTime;default:return String.Empty;}}/// <summary>/// 導出excel/// </summary> [HttpGet]public void ExportData(int programmeId){//獲取方案名稱var programmeName = ProgrammeService.GetProgrammeNameById(programmeId);//獲取列表內(nèi)容var dataFromDb = ProgrammeService.GetProgrammeStatisticEnrolmentExportList(programmeId);var data = dataFromDb.Select(a => new ProgrammeStatisticsEnrolmentDetailsExportViewModel{UserName = a.UserName,Phone = a.Phone,EnrolTime = a.EnrolTimeStr}).ToList();var sFileName = string.Format(CommonConst.Export_Programme_Detail_Excel_Name, programmeName);var dataTable = CommonHelper.ListToDataTable(data);var result = CommonHelper.GetExcelForXLSX(dataTable, GetColumnNameForDetail);Response.ContentType = ResponseConfigure.ContentTypeExcel;SetResponseHeaderForDetail(sFileName);Response.Body.Write(result);Response.Body.Flush();Response.Body.Close();}/// <summary>/// 設定導出的標頭內(nèi)容/// </summary>/// <param name="fileName">導出的文件名</param>private void SetResponseHeaderForDetail(string fileName){Response.Headers.Add(ResponseConfigure.ContentDisposition,ResponseConfigure.Attachment + HttpUtility.UrlEncode(fileName));}

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轉(zhuǎn)載于:https://www.cnblogs.com/teng-0802/p/9271919.html

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