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我有一个使用 .net core 5 的 Blazor 应用程序。我正在尝试运行一个页面来触发电子邮件发送 (EmailSample)，它可以正常工作，直到我尝试添加构造函数注入来记录错误。一旦我添加构造函数注入并重新运行页面，我就会得到一个No parameterless constructor defined for type错误。我没有正确使用它吗？如何修复，这样我就不会收到该错误。如果我能弄清楚如何将记录器作为服务添加到其中Startup.cs/ConfigureServices/services.AddSingleton< ??? > ，然后只在 EmailSample 类中执行 [Inject] 但不知道如何解决，我就可以解决这个问题。

[Inject]
public ILogger _logger { get; set; }

导致错误的代码是......（注意：设置为部分类，而不是在 .razor 页面中@code{}）

public partial class EmailSample
{
    private readonly ILogger<EmailSample> _logger;

    public EmailSample (ILogger<EmailSample> logger)
    {
        _logger = logger;
    }
[Inject]
    public IMailService _mailService { get; set; }
    
    public void SendEmail()
    {
        string emailTo = "test@test.com";
        string emailFrom = "noreply@test.com";
        string emailSubject = "This is a test email.";
        string emailType = "html";         
        string emailCc = string.Empty;

        System.Text.StringBuilder sb = new System.Text.StringBuilder();
        sb.AppendLine("Hello" + " " + emailTo);
        sb.AppendLine("</br>");
        sb.AppendLine("This is a test of the email functionality");
        sb.AppendLine("</br>");
        sb.AppendLine("Best Regards,");
        sb.AppendLine("</br>");
        sb.AppendLine("Signature");
        string emailBody = sb.ToString();

        try
        {
            throw new Exception("This is an email sample exception test");
            //Task tSendEmail = _mailService.SendEmailAsync(emailTo, emailSubject, emailBody, emailFrom, emailCc, emailType);
            //if (tSendEmail.IsCompletedSuccessfully)
            //{
            //    _statusMessage = "The email has been sent successfully.";

            //}
            //else
            //{
            //    _statusMessage = "Failed to send email successfully.";
            //}
         
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "The email for { emailto } failed to send.", emailTo);
        }
    }
    public void OnGet()
    {

        _statusMessage = "";
    }
}
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1 回答 1

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[Inject]
private ILogger<EmailSample> logger {get; set;}

不要忘记命名空间 Microsoft.Extensions.Logging

于 2021-12-31T16:03:56.513 回答