ASP.NET Core直接在一次调用服务器(动态)中返回excel文件(xlsx)？

Question

我找到了在服务器上生成excel文件(xlsx)的解决方案.首次调用它会删除文件demo.xlsx(如果存在)并生成新的demo.xlsx.

首先调用 http:// localhost:8000/api/importexport/export

它生成excel文件(xlsx)并发送url进行下载

第二次调用 http:// localhost:8000/demo.xlsx

下载文件.在Configure方法的Startup类中,您必须添加app.UseStaticFiles();

以下是解决方案的链接 http://www.talkingdotnet.com/import-export-xlsx-asp-net-core/

这个解决方案的问题是我有两次调用服务器.我想在一个调用 http:// localhost:8000/api/importexport/export 中直接下载excel文件(xlsx).我听说可以在一次调用中下载excel文件(xlsx)而无需在服务器上创建文件(动态).我很乐意在一次调用服务器时看到更好的解决方案.

Answer 1

这很简单,只需返回File(比如View或Redirect,但是File):

public async Task<ActionResult> Index()
{
    var fileMemoryStream = await GenerateReportAndWriteToMemoryStream(...);
    return File(
        fileMemoryStream, 
        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", 
        "report.xlsx");
}

此方法是一部分,ControllerBase并有几个签名,选择最适合您的需求:

File(byte[] fileContents, string contentType)
File(Stream fileStream, string contentType)
File(string virtualPath, string contentType)
File(string virtualPath, string contentType, string fileDownloadName)
File(byte[] fileContents, string contentType, string fileDownloadName)
File(Stream fileStream, string contentType, string fileDownloadName)

Answer 2

这是我的解决方案

   private readonly IHostingEnvironment _hostingEnvironment;

    public ImportExportController(IHostingEnvironment hostingEnvironment)
    {
        _hostingEnvironment = hostingEnvironment;
    }

    [HttpGet]
    [Route("Export")]
    public IActionResult Export()
    {
        string sWebRootFolder = _hostingEnvironment.WebRootPath;
        string sFileName = @"demo.xlsx";
        string URL = string.Format("{0}://{1}/{2}", Request.Scheme, Request.Host, sFileName);
        FileInfo file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
        if (file.Exists)
        {
            file.Delete();
            file = new FileInfo(Path.Combine(sWebRootFolder, sFileName));
        }
        using (ExcelPackage package = new ExcelPackage(file))
        {
            // add a new worksheet to the empty workbook
            ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Employee");
            //First add the headers
            worksheet.Cells[1, 1].Value = "ID";
            worksheet.Cells[1, 2].Value = "Name";
            worksheet.Cells[1, 3].Value = "Gender";
            worksheet.Cells[1, 4].Value = "Salary (in $)";

            //Add values
            worksheet.Cells["A2"].Value = 1000;
            worksheet.Cells["B2"].Value = "Jon";
            worksheet.Cells["C2"].Value = "M";
            worksheet.Cells["D2"].Value = 5000;

            worksheet.Cells["A3"].Value = 1001;
            worksheet.Cells["B3"].Value = "Graham";
            worksheet.Cells["C3"].Value = "M";
            worksheet.Cells["D3"].Value = 10000;

            worksheet.Cells["A4"].Value = 1002;
            worksheet.Cells["B4"].Value = "Jenny";
            worksheet.Cells["C4"].Value = "F";
            worksheet.Cells["D4"].Value = 5000;

            package.Save(); //Save the workbook.
        }
        var result = PhysicalFile(Path.Combine(sWebRootFolder, sFileName), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");

        Response.Headers["Content-Disposition"] = new ContentDispositionHeaderValue("attachment")
        {
            FileName = file.Name
        }.ToString();

        return result;
    }

如果有人有更好的解决方案,请发布.