Issues with .NetCore 3.1

[InvincibleDRT]

I am getting following errors when migrating to 3.1 from 2.2

`Unhandled exception. System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types.

Could not load type 'Microsoft.AspNetCore.Http.Authentication.AuthenticationManager' from assembly 'Microsoft.AspNetCore.Http.Abstractions, Version=3.1.19.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

Could not load type 'Microsoft.AspNetCore.Http.Authentication.AuthenticateInfo' from assembly 'Microsoft.AspNetCore.Http.Abstractions, Version=3.1.19.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

Could not load type 'Microsoft.AspNetCore.Http.Features.Authentication.ChallengeBehavior' from assembly 'Microsoft.AspNetCore.Http.Features, Version=3.1.19.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)

at System.Reflection.RuntimeModule.GetTypes()

at System.Reflection.Assembly.GetTypes()

at Hangfire.RecurringJobAdmin.PeriodicJobBuilder.GetAllJobs()

at Hangfire.RecurringJobAdmin.ConfigurationExtensions.UseRecurringJobAdmin(IGlobalConfiguration config, Boolean includeReferences, Assembly[] assemblies)
`

[YanerTavuz]

Have you tried cleaning the solution before rebuilding? Also delete the bin/obj folders.

[InvincibleDRT]

Yeah i tried a fully clean and published version also. same result. Not sure if the support was added for 3.1

[YanerTavuz]

Well, since the targeted frameworks are NET Standard 2.0 and NET Framework 4.6.2, it should be supported.

[SerbanApostol]

It might be due to trimming of unused types on publish or maybe some other reason. The "cause" is that all assemblies are scanned to look for a custom attribute: Hangfire.RecurringJobAdmin.RecurringJobAttribute. One solution is to tell this library exactly what assemblies to look into when adding it to your services (if you use dependency injection and ASP.NET Core; look for the functions with similar signatures):

public static IGlobalConfiguration UseRecurringJobAdmin(this IGlobalConfiguration config, bool includeReferences = false, [NotNull] params Assembly[] assemblies);

Call example:

using Hangfire;
using Hangfire.RecurringJobAdmin;
using Hangfire.Server;
using Hangfire.SqlServer;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Reflection;

static IServiceCollection AddHangfireCustom(this IServiceCollection services, string dbConnectionString)
{
    services.AddHangfire(x => x.UseSqlServerStorage(dbConnectionString)
        .UseRecurringJobAdmin(new Assembly[] { typeof(Startup).Assembly, typeof(PerformContext).Assembly }));
    return services;
}