Core 导出(流和URL两种)

1.流

2.URL

两种都是使用Epplus

1.

EPPlus的基本介绍

EPPlus是一个使用Open Office XML(xlsx)文件格式，能读写Excel 2007/2010 文件的开源组件，在导出Excel的时候不需要电脑上安装office。官网地址：http://epplus.codeplex.com/

使用的话直接NuGet上获取对应的dll即可。

但有一点注意，EPPlus不支持2003版本的Excel。

using (ExcelPackage package=new ExcelPackage())
{
   ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Sheet1");//创建worksheet
   package.Save();
}

　　

单元格赋值
单元格赋值很简单，指定对应的单元格就可以直接赋值，价格遍历循环就可以进行批量的操作了

worksheet.Cells[1, 1].Value = "测试";//直接指定行列数进行赋值
worksheet.Cells["A1"].Value = "赋值";//直接指定单元格进行赋值
设置单元格样式
worksheet.Cells[1, 1].Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;//水平居中
worksheet.Cells[1, 1].Style.VerticalAlignment = ExcelVerticalAlignment.Center;//垂直居中
worksheet.Cells[1, 4, 1, 5].Merge = true;//合并单元格
worksheet.Cells.Style.WrapText = true;//自动换行
设置字体
worksheet.Cells[1, 1].Style.Font.Bold = true;//字体为粗体
worksheet.Cells[1, 1].Style.Font.Color.SetColor(Color.White);//字体颜色
worksheet.Cells[1, 1].Style.Font.Name = "微软雅黑";//字体
worksheet.Cells[1, 1].Style.Font.Size = 12;//字体大小
设置单元格边框
worksheet.Cells[1, 1].Style.Border.BorderAround(ExcelBorderStyle.Thin, Color.FromArgb(191, 191, 191));//设置单元格所有边框
worksheet.Cells[1, 1].Style.Border.Bottom.Style = ExcelBorderStyle.Thin;//单独设置单元格底部边框样式和颜色（上下左右均可分开设置）
worksheet.Cells[1, 1].Style.Border.Bottom.Color.SetColor(Color.FromArgb(191, 191, 191));
设置单元格高和宽
worksheet.Cells.Style.ShrinkToFit = true;//单元格自动适应大小
worksheet.Row(1).Height = 15;//设置行高
worksheet.Row(1).CustomHeight = true;//自动调整行高
worksheet.Column(1).Width = 15;//设置列宽
设置单元格格式
worksheet.Cells[1, 1].Style.Numberformat.Format = "#,##0.00";//这是保留两位小数
设置sheet背景
worksheet.View.ShowGridLines = false;//去掉sheet的网格线
worksheet.Cells.Style.Fill.PatternType = ExcelFillStyle.Solid;
worksheet.Cells.Style.Fill.BackgroundColor.SetColor(Color.LightGray);//设置背景色
worksheet.BackgroundImage.Image = Image.FromFile(@"firstbg.jpg");//设置背景图片
隐藏sheet
worksheet.Hidden = eWorkSheetHidden.Hidden;//隐藏sheet
worksheet.Column(1).Hidden = true;//隐藏某一列
worksheet.Row(1).Hidden = true;//隐藏某一行
图片操作
有时候需求会将某个图片保存至Excel中，代码如下：

ExcelPicture picture = worksheet.Drawings.AddPicture("picture", Image.FromFile(@"firstbg.jpg"));//插入图片
picture.SetPosition(100, 100);//设置图片的位置
picture.SetSize(100, 100);//设置图片的大小
Excel加密和锁定
有时候导出的Excel不希望别人修改，可对Excel进行加密，代码如下：

worksheet.Protection.IsProtected = true;//设置是否进行锁定
worksheet.Protection.SetPassword("yk");//设置密码
worksheet.Protection.AllowAutoFilter = false;//下面是一些锁定时权限的设置
worksheet.Protection.AllowDeleteColumns = false;
worksheet.Protection.AllowDeleteRows = false;
worksheet.Protection.AllowEditScenarios = false;
worksheet.Protection.AllowEditObject = false;
worksheet.Protection.AllowFormatCells = false;
worksheet.Protection.AllowFormatColumns = false;
worksheet.Protection.AllowFormatRows = false;
worksheet.Protection.AllowInsertColumns = false;
worksheet.Protection.AllowInsertHyperlinks = false;
worksheet.Protection.AllowInsertRows = false;
worksheet.Protection.AllowPivotTables = false;
worksheet.Protection.AllowSelectLockedCells = false;
worksheet.Protection.AllowSelectUnlockedCells = false;
worksheet.Protection.AllowSort = false;

　　

public async Task<ActionResult> ExportLog()
        {
            //string sWebRootFolder = _hostingEnvironment.WebRootPath + "/Excel";
            //if (!Directory.Exists(sWebRootFolder))
            //{
            //    Directory.CreateDirectory(sWebRootFolder);//不存在则创建
            //}

            string sFileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";
            //FileInfo fileinfo = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
            //fileinfo.Delete();
            var strem = new MemoryStream();
            
            using (ExcelPackage package = new ExcelPackage(strem))
            {
                // 添加worksheet

                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add(sFileName);
                //添加头
                DailySignInfo cell = new DailySignInfo()
                {
                    Date = "日期",
                    Name = "姓名",
                    Attendancetime = "考勤时段",
                    Time = "时间",
                    Status = "状态"

                };
                worksheet.Cells[1, 1].Value = cell.Date;
                worksheet.Cells[1, 2].Value = cell.Name;
                worksheet.Cells[1, 3].Value = cell.Attendancetime;
                worksheet.Cells[1, 4].Value = cell.Time;
                worksheet.Cells[1, 5].Value = cell.Status;
                //添加值

                int cellnum = 2;
                foreach (var item in query)
                {
                    worksheet.Cells["A" + cellnum].Value = item.date+ item.create_time;
                    worksheet.Cells["B" + cellnum].Value = item.realname;
                    worksheet.Cells["C" + cellnum].Value = item.period_name;
                    //worksheet.Cells["D" + cellnum].Value = item.create_time;
                    worksheet.Cells["D" + cellnum].Value = item.status_name;

                    cellnum++;
                }
                var arr= package.GetAsByteArray();
                strem.Dispose();
                string type = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.Headers.Add("Access-Control-Expose-Headers", "Content-Disposition");//允许前端获取响应头里面的Content-Disposition
                //return Ok("/Excel/" + sFileName);
                //return this.File(sFileName, type, sFileName);
                return new FileContentResult(arr, type)
                {
                    FileDownloadName = sFileName
                };
            }



        }

2.

 private IHostingEnvironment _hostingEnvironment;



        public XlsxController(IHostingEnvironment hostingEnvironment)//名称对应控制器名

        {

            _hostingEnvironment = hostingEnvironment;

        }

 string sWebRootFolder = _hostingEnvironment.WebRootPath;
            string sFileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";
            FileInfo fileinfo = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
            fileinfo.Delete();
            using (ExcelPackage package = new ExcelPackage(fileinfo))
            {
                // 添加worksheet

                ExcelWorksheet worksheet = package.Workbook.Worksheets.Add(sFileName);
                //添加头
                DailySignInfo cell = new DailySignInfo()
                {
                    Date = "日期",
                    Name = "姓名",
                    Attendancetime = "时段",
                    Time = "时间",
                    Status = "状态"

                };
                worksheet.Cells[1, 1].Value = cell.Date;
                worksheet.Cells[1, 2].Value = cell.Name;
                worksheet.Cells[1, 3].Value = cell.dancetime;
                worksheet.Cells[1, 4].Value = cell.Time;
                worksheet.Cells[1, 5].Value = cell.Status;
                //添加值

                int cellnum = 2;
                foreach (var item in query)
                {
                    worksheet.Cells["A" + cellnum].Value = item.date;
                    worksheet.Cells["B" + cellnum].Value = item.realname;
                    worksheet.Cells["C" + cellnum].Value = item.period_name;
                    worksheet.Cells["D" + cellnum].Value = item.create_time;
                    worksheet.Cells["E" + cellnum].Value = item.status_name;

                    cellnum++;
                }
                package.Save();
                string type = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                return this.File(sFileName, type, sFileName);
            }