发送电子邮件时MVC Hangfire错误

Question

我正在尝试使用以下代码发送电子邮件：

var engines = new ViewEngineCollection();
var viewsPath = Path.GetFullPath(HostingEnvironment.MapPath(@"~/Views/Emails"));

var eng = new FileSystemRazorViewEngine(viewsPath);
engines.Add(eng);

foreach (var EmailEntry in EmailEntries)
{
    IEmailService service = new Postal.EmailService(engines);
    var email = new EmailTemplateModel
    {
        ViewName = "EmailTemplateModel",
        FromAddress = "donotreply@email.com",
        EmailAddress = EmailEntry,
        Subject = "Task Report",
        Date = Dates,
        Task = DatesAndTasks,
    };
    service.Send(email);
}

但是当我查看hangfire时，它会显示以下错误：

  

Microsoft.Practices.ServiceLocation.ActivationException

     

尝试获取IViewEngine类型的所有实例时发生激活错误       Microsoft.Practices.ServiceLocation.ActivationException：尝试获取IViewEngine类型的所有实例时发生激活错误---＆gt; System.ArgumentNullException：值不能为null。       参数名称：httpContext