Asp.NetCore創建一個控制器來使用SendGrid發送電子郵件

我正在嘗試按照此https://www.ryadel.com/en/asp-net-core-send-email-messages-sendgrid-api/教程創建一個控制器

我已經添加了除控制器之外的所有內容。我在控制器中的代碼是這個

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("[email protected]", "subject", "something");
        return Ok(await _emailSender.SendEmailAsync("[email protected]", "subject", "something"));
    }
}

但我收到以下錯誤

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

我希望能夠看到來自發送網格的回應是否已發送。

這是 SendGridEmailSender 類：

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);
    }
}

uj5u.com熱心網友回復：

您沒有回傳private您擁有的方法的結果：

await Execute(Options.ApiKey, subject, message, email);

所以，你需要回傳結果

public async Task SendEmailAsync(
    string email, 
    string subject, 
    string message)
{
    result = await Execute(Options.ApiKey, subject, message, email);
    // do some checks with result
}

如果您需要檢查控制器代碼中的結果，這將更加棘手，因為 的簽名IEmailSender不提供通用任務物件，您需要手動轉換它（不推薦）。您可以簡單地假設方法完成后發送成功（因為在其他情況下您會得到例外）：

public async Task<ActionResult> SendEmail() {
    await _emailSender.SendEmailAsync("[email protected]", "subject", "something");
    // email was sent, no exception
    return Ok();
}

如果您需要該方法的回應，您可以使用 執行類似此答案的操作_emailSender.SendEmailAsync("[email protected]", "subject", "something")，而不使用await構造（仍然不能推薦這種方法）：

/// <summary> 
/// Casts a <see cref="Task"/> to a <see cref="Task{TResult}"/>. 
/// This method will throw an <see cref="InvalidCastException"/> if the specified task 
/// returns a value which is not identity-convertible to <typeparamref name="T"/>. 
/// </summary>
public static async Task<T> Cast<T>(this Task task)
{
    if (task == null)
        throw new ArgumentNullException(nameof(task));
    if (!task.GetType().IsGenericType || task.GetType().GetGenericTypeDefinition() != typeof(Task<>))
        throw new ArgumentException("An argument of type 'System.Threading.Tasks.Task`1' was expected");

    await task.ConfigureAwait(false);

    object result = task.GetType().GetProperty(nameof(Task<object>.Result)).GetValue(task);
    return (T)result;
}

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