public async Task <ActionResult> DownloadDatasets(string datasetId)
{
string filename;
var fileStream = _exportService.DownloadDataset(datasetId, out filename);
if (fileStream == null)
{
return(NotFound("cannot file ddlkjaskjh "));
}
HttpContext.Response.Clear();
Response.ContentType = "application/octet-stream";
Response.Headers.Add("content-disposition", "attachment");
Response.Headers.Add("x-filename", filename + ".csv");
Response.Headers.Add("content-length", fileStream.Length.ToString());
Response.Headers.Add("Access-Control-Expose-Headers", "x-filename , content-length, content-disposition");
Response.Headers.Add("Access-Control-Allow-Origin", "*");
await fileStream.CopyToAsync(HttpContext.Response.Body);
fileStream.Close();
return(new FileStreamResult(fileStream, "text/csv")
{
FileDownloadName = filename + ".csv"
});
}