[英]csvhelper: how to write a specific "cell" on an existing csv on C#?
我有一個 csv 格式的客戶列表,我用它來發送電子郵件。 我想在執行每一行后寫入 CSV 以放置條件規則。 我正在使用 csvhelper 來操作文件。 這是代碼:
var scan = new StreamReader(myBlob);
var csvv = new CsvReader(scan, CultureInfo.InvariantCulture);
var records = csvv.GetRecords<Records>().ToList();
var scanwriter = new StreamWriter(myBlob4);
var csvwriter = new CsvWriter(scanwriter, CultureInfo.InvariantCulture);
foreach (Records record in records)
{
var from = new EmailAddress("example.com", "John");
var to = new EmailAddress(record.Email, record.Name);
var subject = "exapmple";
var msg = MailHelper.CreateSingleEmail(from, to, subject, txtf, htmlf);
StringBuilder text = new StringBuilder();
text.AppendFormat("sent", record.EmailSent);
csvwriter.WriteField(record.EmailSent);
csvwriter.NextRecord();
var response = await client.SendEmailAsync(msg);
}
但是,我的 csv 沒有將“已發送”值附加到 emailsent 列下的文件中。 我正在使用 StringBuilder,這在這種情況下可能沒有幫助。
看起來你正在嘗試做更多這樣的事情。
void Main()
{
var records = new List<SendEmail>
{
new SendEmail{ Email = "example.com", Name = "John" },
new SendEmail{ Email = "example2.com", Name = "Jenny" }
};
var csvwriter = new CsvWriter(Console.Out, CultureInfo.InvariantCulture);
foreach (var record in records)
{
// var from = new EmailAddress("example.com", "John");
// var to = new EmailAddress(record.Email, record.Name);
//
// var subject = "exapmple";
//
// var msg = MailHelper.CreateSingleEmail(from, to, subject, txtf, htmlf);
record.EmailSent = "sent";
csvwriter.WriteRecord(record);
csvwriter.NextRecord();
//var response = await client.SendEmailAsync(msg);
}
}
public class SendEmail
{
public string Email { get; set; }
public string Name { get; set; }
public string EmailSent { get; set; }
}
//using blocks will make sure the streams and disposed and file handles are closed properly,
// **even if an exception is thrown **
using(var scan = new StreamReader(myBlob))
using (var csvv = new CsvReader(scan, CultureInfo.InvariantCulture))
using (var scanwriter = new StreamWriter(myBlob4))
using (var csvwriter = new CsvWriter(scanwriter, CultureInfo.InvariantCulture))
{
var records = csvv.GetRecords<Records>(); //ToList() was not needed or helpful here
foreach (var record in records)
{
var from = new EmailAddress("example.com", "John");
var to = new EmailAddress(record.Email, record.Name);
var subject = "example";
var msg = MailHelper.CreateSingleEmail(from, to, subject, txtf, htmlf);
csvwriter.WriteField($"sent {record.EmailSent}");
csvwriter.NextRecord();
var response = await client.SendEmailAsync(msg);
}
}
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