c# - SmtpClient.SendAsync 代码审查

Question

在使用 SendAsync 时处理 SmtpClient 和 MailMessage 的正确方法是什么？

我已经在下面复制了我的代码。

{
...
var client = new SmtpClient {Host = _smtpServer};
client.SendCompleted += SendCompletedCallback;
var userState = mailMessage;
client.SendAsync(mailMessage, userState);
...
}

private static void SendCompletedCallback(object sender, 
    AsyncCompletedEventArgs e)
{
    // Get the unique identifier for this asynchronous operation.
    var mailMessage= (MailMessage)e.UserState;

    if (e.Cancelled)
    {
        Log.Info(String.Format("[{0}] Send canceled.", mailMessage));
    }
    if (e.Error != null)
    {
        Log.Error(String.Format("[{0}] {1}", mailMessage, e.Error));
    }
    else
    {
        Log.Info("Message sent.");
    }
    mailMessage.Dispose();
}

在 client.SendAsync(...) 之后处理 MailMessage 会引发异常。我需要在回调处理程序中处理它。

Answer 1

我认为这会有所帮助

   client.SendCompleted += (s, e) => { client.Dispose(); message.Dispose(); };