ASP.netからASP.netコアにコードを移行しようとしています。
ASP.netコードの場合と同様に、
var progresses = db.Progresses.Where(p => p.UserId == id).Include(p => p.User.UserMetaData).Include(p => p.Quiz).Include(p => p.User.Groups).OrderByDescending(p => p.UpdatedAt).ToList();
List<ReportCSVModel> reportCSVModels = new List<ReportCSVModel>();
const string downloadName = "Reports.csv";
var csv = new CsvWriter(Response.Output);
csv.Configuration.RegisterClassMap<ReportCSVMap>();
Response.ClearContent();
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition",
"attachment; filename=" + downloadName);
csv.WriteHeader<ReportCSVModel>();
foreach (var progress in progresses)
{
var reportCSVModel = new ReportCSVModel();
reportCSVModel.Quiz = progress.Quiz.Title;
reportCSVModel.Score = (progress.CorrectAnswersCount * progress.PointsPerQuestion).ToString();
reportCSVModel.Status = progress.Status;
reportCSVModel.CompletedDate = progress.UpdatedAt.ToString();
reportCSVModel.Location = progress.User.UserMetaData != null ? progress.User.UserMetaData.Location : "";
reportCSVModel.Group = progress.User.Groups.FirstOrDefault() != null ? progress.User.Groups.FirstOrDefault().Name : "";
csv.WriteRecord<ReportCSVModel>(reportCSVModel);
}
Response.Flush();
Response.End();
return null;
しかし、ASP.NETコアで使用している間、私はそれを次のように変換しました、
var progresses = _elearnContext.Progress.Where(p => p.UserId == id).Include(p => p.User.UserMetaData).Include(p => p.Quiz).Include(p => p.User.Groups).OrderByDescending(p => p.UpdatedAt).ToList();
// List<ReportCSVModel> reportCSVModels = new List<ReportCSVModel>();
List<ReportCSVModel> reportCSVModels = new List<ReportCSVModel>();
const string downloadName = "Reports.csv";
System.IO.TextWriter writeFile = new StreamWriter(Response.Body.ToString());
CsvWriter csv = new CsvWriter(writeFile);
csv.Configuration.RegisterClassMap<GroupReportCSVMap>();
Response.Clear();
Response.ContentType = "application/octet-stream";
Response.Headers.Add("Content-Disposition", "attachment; filename=" + downloadName);
csv.WriteHeader<ReportCSVModel>();
foreach (var progress in progresses)
{
var reportCSVModel = new ReportCSVModel();
reportCSVModel.Quiz = progress.Quiz.Title;
reportCSVModel.Score = (progress.CorrectAnswersCount * progress.PointsPerQuestion).ToString();
reportCSVModel.Status = progress.Status;
reportCSVModel.CompletedDate = progress.UpdatedAt.ToString();
reportCSVModel.Location = progress.User.UserMetaData != null ? progress.User.UserMetaData.Location : "";
reportCSVModel.Group = progress.User.Groups.FirstOrDefault() != null ? progress.User.Groups.FirstOrDefault().Name : "";
csv.WriteRecord<ReportCSVModel>(reportCSVModel);
}
Response.Clear();
return null;
ASP.netでは、Response.Output
は使用できますが、コアでは使用できません。 Response.Body
のように使ってみました
誰かが教えてくれますか?
現在提案されている構文にさらに合わせるためにアプローチを変更することを検討してください。
CSVを作成してFileResultを返します。これにより、コードがResponse
オブジェクトを直接操作する必要がなくなります。
[HttpGet]
public IActionResult MyExportAction() {
var progresses = _elearnContext.Progress.Where(p => p.UserId == id)
.Include(p => p.User.UserMetaData)
.Include(p => p.Quiz)
.Include(p => p.User.Groups)
.OrderByDescending(p => p.UpdatedAt)
.ToList()
.Select(progress =>
new ReportCSVModel() {
Quiz = progress.Quiz.Title,
Score = (progress.CorrectAnswersCount * progress.PointsPerQuestion).ToString(),
Status = progress.Status,
CompletedDate = progress.UpdatedAt.ToString(),
Location = progress.User.UserMetaData != null ? progress.User.UserMetaData.Location : "",
Group = progress.User.Groups.FirstOrDefault() != null ? progress.User.Groups.FirstOrDefault().Name : ""
}
);
List<ReportCSVModel> reportCSVModels = progresses.ToList();
var stream = new MemoryStream();
using(var writeFile = new StreamWriter(stream, leaveOpen: true)) {
var csv = new CsvWriter(writeFile, true);
csv.Configuration.RegisterClassMap<GroupReportCSVMap>();
csv.WriteRecords(reportCSVModels);
}
stream.Position = 0; //reset stream
return File(stream, "application/octet-stream", "Reports.csv");
}