Asp.net mvc 在子网站中使用Postal和Hangfire

我一直在尝试在我的MVC5网站上使用Postal。当我将我的网页托管到子网站ie时，我收到了错误消息

• 虚拟路径“/”映射到另一个应用程序，这是不允许的

我已经调试到创建ControllerContext时，HttpContext设置不正确。因为我是从Hangfire运行Postal，所以HttpContext.Current总是空的。Postal使用下面的代码创建ContollerContext

        ControllerContext CreateControllerContext()
    {
        // A dummy HttpContextBase that is enough to allow the view to be rendered.
        var httpContext = new HttpContextWrapper(
            new HttpContext(
                new HttpRequest("", UrlRoot(), ""),
                new HttpResponse(TextWriter.Null)
            )
        );
        var routeData = new RouteData();
        routeData.Values["controller"] = EmailViewDirectoryName;
        var requestContext = new RequestContext(httpContext, routeData);
        var stubController = new StubController();
        var controllerContext = new ControllerContext(requestContext, stubController);
        stubController.ControllerContext = controllerContext;
        return controllerContext;
    }

    string UrlRoot()
    {
        var httpContext = HttpContext.Current;
        if (httpContext == null)
        {
            return "http://localhost";
        }

        return httpContext.Request.Url.GetLeftPart(UriPartial.Authority) +
               httpContext.Request.ApplicationPath;
    }

---

我怎样才能指定UrlRoot，而不是使用默认的localhost来根据我的子网站进行拉取？

我按照这里的说明发送电子邮件。教程中的方法如下所示

    public static void NotifyNewComment(int commentId)
{
// Prepare Postal classes to work outside of ASP.NET request
var viewsPath = Path.GetFullPath(HostingEnvironment.MapPath(@"~/Views/Emails"));
var engines = new ViewEngineCollection();
engines.Add(new FileSystemRazorViewEngine(viewsPath));

var emailService = new EmailService(engines);

// Get comment and send a notification.
using (var db = new MailerDbContext())
{
    var comment = db.Comments.Find(commentId);

    var email = new NewCommentEmail
    {
        To = "yourmail@example.com",
        UserName = comment.UserName,
        Comment = comment.Text
    };

    emailService.Send(email);
}
}

我发现问题是FileSystemRazorViewEngine没有被邮政部门使用。为了使这项工作正常进行，我必须确保FileSystemRazorViewEngine是可用的系统中的第一个引擎。然后我删除了它，因为我不希望它成为默认引擎。下面是我更新的方法

    public static void NotifyNewComment(int commentId)
{
// Prepare Postal classes to work outside of ASP.NET request
var viewsPath = Path.GetFullPath(HostingEnvironment.MapPath(@"~/Views/Emails"));
var eng = new FileSystemRazorViewEngine(viewsPath));
ViewEngines.Engines.Insert(0, eng);

var emailService = new EmailService(engines);

// Get comment and send a notification.
using (var db = new MailerDbContext())
{
    var comment = db.Comments.Find(commentId);

    var email = new NewCommentEmail
    {
        To = "yourmail@example.com",
        UserName = comment.UserName,
        Comment = comment.Text
    };

    emailService.Send(email);
    ViewEngines.Engines.RemoveAt(0)
}
}

---

下面是另一个可能的解决方案，我认为比上面更优雅。它还解决了在执行后台进程时访问MVC应用程序时出现的问题

public static void SendTypedEmailBackground()
{
    try
    {
        var engines = new ViewEngineCollection();
        var viewsPath = Path.GetFullPath(HostingEnvironment.MapPath(@"~/Views/Emails"));

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

        var email = new WebApplication1.Controllers.EmailController.TypedEmail();
        email.Date = DateTime.UtcNow.ToString();
        IEmailService service = new Postal.EmailService(engines);
        service.Send(email);

    }
    catch(Exception ex)
    {
        throw ex;
    }
}

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谢谢。不过我得到了一个错误（无法将null转换为'bool'，因为它是不可为null的值类型）。你知道为什么会这样吗？