如何使用Hangfire呼叫异步动作方法

Question

I am working on an asp.net mvc5 web application, and i installed the Hangfire :-

Install-Package Hangfire

after that i created a startup.css class as follow:-

public class Startup
{
   public void Configuration(IAppBuilder app)
   {

   }
}

then inside my global.asax file i tried calling 2 action methods ; Index () & ScanServer() , as follow:-

 HomeController h = new HomeController();
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            RouteConfig.RegisterRoutes(RouteTable.Routes);


            RecurringJob.AddOrUpdate(() =>  h.Index(), Cron.Minutely);
        }

&

 RecurringJob.AddOrUpdate(() =>  h.ScanServer(*****), Cron.Minutely);

now when Hangfire tried calling the Index() action method which have the following definition :-

 public ActionResult Index()

i got this error:-

JobStorage.Current property value has not been initialized. You must set it before using Hangfire Client or Server API.

while when Hangfire tried calling the ScanServer() action method which is an async Task ,which have the following definition :-

 public async Task<ActionResult> ScanServer(string tokenfrom)

i got this error:-

Async methods are not supported. Please make them synchronous before using them in background.

so can anyone advice how to fix these 2 issues ?

Thanks

EDIT

i wrote the following inside the Startup class:-

using Hangfire;
using Microsoft.Owin;
using Owin;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using ScanningFinal;
[assembly: OwinStartup(typeof(Startup))]
namespace ScanningFinal
{

    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            GlobalConfiguration.Configuration
           .UseSqlServerStorage("scanservice");
        }
    }
}

& here is the connection string:-

 <add name="scanservice"    connectionString="data source=localhost;initial catalog=ScanningService;integrated security=True" providerName="System.Data.SqlClient"/>

but i am still getting this error :-

JobStorage.Current property value has not been initialized. You must set it before using Hangfire Client or Server API.

Answer 1

You need to configure Hangfire within your Configuration method.

[assembly: OwinStartup(typeof(YourApp.Startup))] // Change YourApp to your base namespace
public partial class Startup
{
    public void Configuration(IAppBuilder app)
    {
        app.UseHangfire(config => 
        {
            config.UseSqlServerStorage("NameOfConnectionStringKey"); // Other storage options are available
            config.UseDashboardPath("/hangfire");
            config.UseServer();
        });
    }
}

Basically your first issue is that you haven't configured Hangfire to use a database. With the above solution, I'm telling hangfire to use SqlServer as the job storage, passing it the connectionString key that is defined in the web.config. If you do not wish to use SQL Server, then you can use other storage options - I've had success with MongoDB in my projects.

I'm also then setting the path to the dashboard, so you can access the pretty UI in your browser.

You can also supply your chosen dependency injection here too.

As to your second question, are you able to alter your service method from async to a syncronous method?