尝试在c＃中将csv作为电子邮件附件发送

Question

When I use StreamWriter.WriteLine it doesn't seem to write anything to a MemoryStream .

-"data" is something that is previously populated. It is an object[] that includes objects that have Name, Date, and PhoneNumber.

StreamWriter sw = new StreamWriter(new MemoryStream());
CustomerReport[] customers = (CustomerReport[])data;
foreach (var d in customers)
{
    sw.WriteLine($"{d.Name},{d.Date},{d.PhoneNumber}");
}
Attachment attachment = new Attachment(sw.BaseStream, "CustomerReport.csv", "text/csv");

However the csv attachment is always an empty csv .

Update: I got it figured out. It was actually the MemoryStream() . I just set my MemoryStream() which in this case is sw.BaseStream.Postion = 0

Below is a working version:

StreamWriter sw = new StreamWriter(new MemoryStream());
CustomerReport[] customers = (CustomerReport[])data;
foreach (var d in customers)
{
    sw.WriteLine($"{d.Name},{d.Date},{d.PhoneNumber}");
    sw.Flush();
}
sw.BaseStream.Position = 0;
Attachment attachment = new Attachment(sw.BaseStream, "CustomerReport.csv", "text/csv");

Answer 1

尝试在foreach之后调用Flush方法：

sw.Flush();