Question

我有ASP.net MVC 5应用程序，我想在excel中生成报告

目前我已经指定了一个路径，但我想要的是excel应该下载到不在路径上的客户端计算机上。

public void GenerateExcel()
{
     Excel.Application application = new Excel.Application();
            Excel.Workbook workbook = application.Workbooks.Add(System.Reflection.Missing.Value);
            Excel.Worksheet worksheet = workbook.ActiveSheet;

            worksheet.Cells[1, 1] = "ID";
            worksheet.Cells[1, 2] = "Full Name";
            worksheet.Cells[1, 3] = "Position Title";
            worksheet.Cells[1, 4] = "Unit";
            worksheet.Cells[1, 5] = "Mobile";
            worksheet.Cells[1, 6] = "Email";
            worksheet.Cells[1, 7] = "Supervisor Email";
            worksheet.Cells[1, 8] = "Date and Time of Travel";
            worksheet.Cells[1, 9] = "Type of Trip";
            worksheet.Cells[1, 10] = "Distination";



            var query = from v in db.MyContextVR
                        join t in db.MyTripTypeContext on v.TypeOfTripId equals t.Id
                        select new VRsVM
                        {
                            Id = v.Id,
                            FullName = v.FullName,
                            PostitionTitle = v.PostitionTitle,
                            Unit = v.Unit,
                            Mobile = v.Mobile,
                            Email = v.Email,
                            SupervisorEmail = v.SupervisorEmail,
                            DateAndTimeOfTravel = v.DateAndTimeOfTravel,
                            TripName = t.TripName,
                            Distination = v.Distination
                        };


            int row = 2;
            foreach (var item in query.ToList())
            {
                worksheet.Cells[row, 1] = item.Id;
                worksheet.Cells[row, 2] = item.FullName;
                worksheet.Cells[row, 3] = item.PostitionTitle;
                worksheet.Cells[row, 4] = item.Unit;
                worksheet.Cells[row, 5] = item.Mobile;
                worksheet.Cells[row, 6] = item.Email;
                worksheet.Cells[row, 7] = item.SupervisorEmail;
                worksheet.Cells[row, 8] = item.DateAndTimeOfTravel;
                worksheet.Cells[row, 9] = item.TripName;
                worksheet.Cells[row, 10] = item.Distination;


                row++;
            }
            workbook.SaveAs("D:\\tempex/myreport.xlsx");

            workbook.Close();
}

Answer 1

假设您已经制作了Excel电子表格：

public HttpResponseMessage GetExcel()
{
    var workbook = yourExcel; //Whatever you do to create one.
    HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, "Excel download");
    MemoryStream myStream = new MemoryStream();
    workbook.Write(myStream); // This is for NPOI, you'll have to do the right one for your tool (which is unspecified currently).
    response.Content = new ByteArrayContent(myStream.ToArray());
    response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
    {
        FileName = fileName
    };
    myStream.Close();
}

不要忘记包含自定义try-catch逻辑！

Answer 2

将excel文件保存到服务器中，然后将其转换为字节数组，然后通过File（）辅助方法将其返回到客户端，作为来自asp.net mvc操作方法的ActionResult / FileResult

  public ActionResult ExportToExcel(...) {

        your codes....

        string tempPath = AppDomain.CurrentDomain.BaseDirectory + DateTime.Now.Hour + DateTime.Now.Minute + DateTime.Now.Second + DateTime.Now.Millisecond + "_temp";
        workbook.SaveAs(tempPath, workbook.FileFormat);
        tempPath = workbook.FullName;
        workbook.Close();    
        byte[] result = File.ReadAllBytes(tempPath);
        File.Delete(tempPath);

       this.Response.AddHeader("Content-Disposition", "Employees.xls");
       this.Response.ContentType = "application/vnd.ms-excel";

       return File(result, "application/vnd.ms-excel");

  }

Answer 3

您可以使用EPPlus之类的内容在内存流中轻松创建Excel文档。之后，您可以使用content-disposition将其提供给客户端（作为下载）。

按照Corey Adler的这篇精彩教程：
Easy Excel Interaction with EPPlus

Answer 4

在生成Excel文件时，你有几个选项，我个人使用免费的ClosedXml库得到了很好的结果，这个库也可以通过NuGet获得。我不会这么做，因为我觉得这不是问题的重点！

如果您想将Excel文件作为Mvc中的下载文件发送回客户端，则无论您选择生成库，都需要先将文件保存到流中以获取文件的数据

using (System.IO.MemoryStream outputStream = new System.IO.MemoryStream())
{
     workbook.SaveAs(outputStream);
     outputStream.Seek(0, SeekOrigin.Begin);
     data = new byte[outputStream.Length];
     outputStream.Read(data, 0, (int)outputStream.Length);
}

然后，一旦获得模板中的数据，您就可以从控制器操作中将其发送回用户：

public ActionResult Download() {
    byte[] data = GetExcel();   
    return File(data, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "Filename.xlsx")
}

修改

还有一个File方法的重载，它接受一个Stream，因此如果你已经有一个文件流，你可以跳过将它转换为字节数组

如何在ASP.Net MVC中为客户端计算机创建新的Excel文件

4 个答案: