尝试在C＃中将csv作为电子邮件附件发送

Question

当我使用StreamWriter.WriteLine时，它似乎没有向MemoryStream写任何内容。

- “数据”是以前填充的内容。它是一个对象[]，包括具有Name，Date和PhoneNumber的对象。

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");

但csv附件始终为空csv。

更新： 我明白了。它实际上是MemoryStream()。 我只是设置MemoryStream()，在这种情况下是sw.BaseStream.Postion = 0

以下是工作版本：

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();