c# - 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:

Cannot await 'void'

但是如果我这样做:

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:

The async method lacks 'await' and will run synchronously.

我显然遗漏了什么，只是不确定是什么。

Answer 1

正如其他人所指出的，SendAsync 有点误导。它返回一个 void，而不是一个 Task。如果你想等待一个发送邮件的调用你需要使用方法

SendMailAsync(MailMessage message)

或

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

这两个都返回一个 Task 并且可以等待