如何等待MailMessage.SendAsync？

Question

如果我这样做:

public async Task<SendEmailServiceResponse> ExecuteAsync(SendEmailServiceRequest request)
    {
        ....
        var response = new SendEmailServiceResponse();
        await client.SendAsync(mail, null); // Has await
        response.success = true;
        return response;
    }

然后我明白了:

无法等待'无效'

但如果我这样做:

public async Task<SendEmailServiceResponse> ExecuteAsync(SendEmailServiceRequest request)
    {
        ....
        var response = new SendEmailServiceResponse();
        client.SendAsync(mail, null); // No Await
        response.success = true;
        return response;
    }

我明白了:

异步方法缺少'await'并将同步运行.

我显然缺少一些东西,只是不确定是什么.

Answer 1

正如其他人所指出的那样SendAsync有点误导.它返回一个void,而不是一个Task.如果要await发送邮件,则需要使用该方法

SendMailAsync(MailMessage message)

要么

SendMailAsync(string from, string recipients, string subject, string body)

这两个都返回Task并且可以等待