C# SMTPClient 超时问题
我想知道，您是否真的需要手动增加发送操作的超时才能发送大附件。我阅读了位于此处 它表示超时长度为 100 秒。我想知道是否可以直接告诉它继续运行，直到发现错误或邮件消息发送成功，而不是使用超时？
I was wondering, do you really have to increase the timeout of a send operation manually for sending large attachments. I read the Microsoft documentation located here and it says the timeout length is 100 seconds. Instead of working with timeout, I was wondering if its possible to rather just tell it to continue going until either an error is found or the mail message is sent successfully?
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您链接的页面已经给出了答案：使用 SendAsync 方法。来自 SendAsync 文档：
SendCompleted 事件需要一个 SendCompletedEventHandler 委托，该委托又接收一个 < a href="http://msdn.microsoft.com/en-us/library/x5x13z6h.aspx" rel="nofollow noreferrer">AsyncCompletedEventArgs 实例，可用于判断发送是否成功。
The very page you link already gives the answer: use the SendAsync method. From the SendAsync documentation:
The SendCompleted event requires a SendCompletedEventHandler delegate, which in turn receives a AsyncCompletedEventArgs instance, which can be used to find out whether sending succeeded.