.net core 2.0 无法下载文件夹中保存的文件。

Question

在我想下载此文件后，我将数据网格中的信息保存到文件夹中的 xslx 文件。 我有代码，工作正常，但是在我的项目中，当我尝试下载文件时，它什么也没返回。也许是因为保护或用户角色是管理员。 我尝试过使用不同的文件夹，我确信该文件夹不是问题。 还能是什么？

 public FileResult downloadFile(string filePath)
            {
                IFileProvider provider = new PhysicalFileProvider(filePath);
                IFileInfo fileInfo = provider.GetFileInfo(fileName);
                var readStream = fileInfo.CreateReadStream();
                var mimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                return File(readStream, mimeType, fileName);
            }

Answer 1

我已经尝试了你的代码，一切似乎都很好

public IActionResult Index()
{
    var fileName = "SN-export.xlsx";
    string filePath = _hostingEnvironment.WebRootPath;
    string fileName2 = Path.Combine(filePath, fileName);
    FileInfo excelFile = new FileInfo(fileName2);
    if (excelFile.Exists) {
        excelFile.Delete();
        excelFile =  new FileInfo(fileName2);
    }
    // excel.SaveAs(excelFile); Have to comment this because i don't know what excel nuget you are using
    // For testing purpose i have used the following two lines
    var file = System.IO.File.Create(excelFile.ToString());
    file.Close();
    return DownloadFile(filePath, fileName);
}

public FileResult DownloadFile(string filePath,string fileName)
{ 
    IFileProvider provider = new PhysicalFileProvider(filePath);
    IFileInfo fileInfo = provider.GetFileInfo(fileName);
    var readStream = fileInfo.CreateReadStream();
    var mimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    return File(readStream, mimeType, fileName);
}