SendMailAsync:异步模块或处理程序在异步操作仍处于挂起状态时完成 [英] SendMailAsync : An asynchronous module or handler completed while an asynchronous operation was still pending

问题描述

使用SendMailAsync时，出现以下错误:

While using SendMailAsync I am getting the following error:

异步完成的异步模块或处理程序 操作仍在等待中

An asynchronous module or handler completed while an asynchronous operation was still pending

我的代码:

public static async Task SendEmail(MessageContent messageContent, string emailBody)
{
   SmtpClient smtpClientNoSend = new SmtpClient();
   await smtpClientNoSend.SendMailAsync(mailMessage);
}

从控制器呼叫:

public async System.Threading.Tasks.Task<ActionResult> Register()
{
   await SendEmail();
}

private void SendEmail()
{
  SMTPEmail.SendEmail(msg, output.ToString());
  return null;
}

推荐答案

您的呼叫层次结构已损坏.您不应该使用async void，这仅适用于事件处理程序，而应使用async Task:

Your call hierarchy is broken. You shouldn't use async void, that is ment for event handlers only, use async Task instead:

public static Task SendEmailAsync(MessageContent messageContent, string emailBody)
{
   SmtpClient smtpClientNoSend = new SmtpClient();
   return smtpClientNoSend.SendMailAsync(mailMessage);
}

public async Task<ActionResult> Register()
{
   await SendEmailAsync();
}

private Task SendEmailAsync()
{
   return SMTPEmail.SendEmailAsync(msg, output.ToString());
}

旁注-我不确定为什么会有这么多的SendMail方法，您可以将它们缩小到单个方法调用之内.

Side note - I'm not sure why you have so many SendMail methods, You could narrow them down to a single method call.

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