Asp.Net Core 创建一个控制器来使用 SendGrid 发送邮箱

我正在try 根据这https://www.ryadel.com/en/asp-net-core-send-email-messages-sendgrid-api/个教程创建一个控制器

除了控制器之外，我已经添加了所有内容.控制器中的代码是

public class SendGridController : BaseApiController
{
    private readonly IEmailSender _emailSender;
    public SendGridController(IEmailSender emailSender)
    {
        _emailSender = emailSender;
        
    }

    [HttpPost]
    [ProducesResponseType(typeof(string), (int)HttpStatusCode.OK)]
    [ProducesResponseType(typeof(string), (int)HttpStatusCode.BadRequest)]
    [ProducesResponseType((int)HttpStatusCode.Unauthorized)]
    [ProducesResponseType(typeof(string), (int)HttpStatusCode.InternalServerError)]
    public async Task<ActionResult> SendEmail() {
        await _emailSender.SendEmailAsync("test@mail.com", "subject", "something");
        return Ok(await _emailSender.SendEmailAsync("test@mail.com", "subject", "something"));
    }
}

但我发现以下错误

Argument 1: cannot convert from 'void' to 'object'

我希望能够看到来自发送网格的响应，如果它已经发送或没有.

以下是SendGridEmailSender类:

public class SendGridEmailSender : IEmailSender
{
    public SendGridEmailSender(
        IOptions<SendGridEmailSenderOptions> options
        )
    {
        this.Options = options.Value;
    }

    public SendGridEmailSenderOptions Options { get; set; }

    public async Task SendEmailAsync(
        string email, 
        string subject, 
        string message)
    {
        await Execute(Options.ApiKey, subject, message, email);
    }

    private async Task<Response> Execute(
        string apiKey, 
        string subject, 
        string message, 
        string email)
    {
        var client = new SendGridClient(apiKey);
        var msg = new SendGridMessage()
        {
            From = new EmailAddress(Options.SenderEmail, Options.SenderName),
            Subject = subject,
            PlainTextContent = message,
            HtmlContent = message
        };
        msg.AddTo(new EmailAddress(email));

        // disable tracking settings
        // ref.: https://sendgrid.com/docs/User_Guide/Settings/tracking.html
        msg.SetClickTracking(false, false);
        msg.SetOpenTracking(false);
        msg.SetGoogleAnalytics(false);
        msg.SetSubscriptionTracking(false);

        return await client.SendEmailAsync(msg);
    }
}