How to create Startup file in Web ASP.NET (.NET Framework)?

Question

I have a build in VB.NET as ASP.NET (.NET Framework) so it's not a CORE application.

The web site has lot's of API's build in WebApi 2 inside it and now I was going to make an authentication API via JWT, actually I have yet a Controller which return JWT token but now I have to validate it...

As I've read on the web I have to validate it throw a middleware like OWIN so I need to add the following method inside Startup class:

Public Class Startup
    Public Sub Configuration(ByVal app As IAppBuilder)
        app.UseJwtBearerAuthentication(New JwtBearerAuthenticationOptions With {
            .AuthenticationMode = AuthenticationMode.Active,
            .TokenValidationParameters = New TokenValidationParameters() With {
                .ValidateIssuer = True,
                .ValidateAudience = True,
                .ValidateIssuerSigningKey = True,
                .ValidIssuer = "url",
                .ValidAudience = "url",
                .IssuerSigningKey = New SymmetricSecurityKey(Encoding.UTF8.GetBytes("my_secret_key_12345"))
            }
        })
    End Sub
End Class

But the issue is that by right-clicking the project and by > adding new element the Startup class doesn't exist...

So how can I create one? As I've read the project must be .NET Core to use Owin Startup class.. so should I rebuild all my project in Core or I can anyway find a way to authenticate JWT token without it?

This should give a start for your further researches: stackoverflow.com/questions/49407749/… — Steve
– Steve, Commented Jan 7, 2020 at 9:28
In ASP.NET you can add a global.asax file and handle the Application_Start method. I'm not sure if that helps or not. — gritware
– gritware, Commented Jan 7, 2020 at 21:00
Does this answer your question? ASP.NET Web Api - Startup.cs doesn't exist — Heretic Monkey
– Heretic Monkey, Commented Sep 28, 2023 at 16:49

Jeff Barnard · Accepted Answer · 2020-01-07 19:12:25Z

1

You can add an Owin startup class to a .NET Framework project by using the following attribute

[assembly: OwinStartup(typeof(myNamespace.Startup))]

namespace myNamespace
{
    /// <summary>
    /// OWIN startup class, automatically starts when app starts
    /// </summary>
    public partial class Startup
    {
        public void Configuration(IAppBuilder app)

This should work in vb .net by using this syntax

<Assembly: OwinStartup(GetType(myNamespace.Startup))]

Just add a regular class called Startup to your project and this should work.

edited Jan 7, 2020 at 19:12

answered Jan 7, 2020 at 18:57

Jeff Barnard

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