Kianoush Kianoush - 1 month ago 61
C# Question

The following errors occurred while attempting to load the app. - The OwinStartupAttribute.FriendlyName value

i want to create dropdown list with

AspNetRoles
. i use this code :

Idnetity Conf :

public class ApplicationRoleManager : RoleManager<IdentityRole>
{
public ApplicationRoleManager(IRoleStore<IdentityRole, string> roleStore)
: base(roleStore)
{
}

public static ApplicationRoleManager Create(IdentityFactoryOptions<ApplicationRoleManager> options, IOwinContext context)
{
return new ApplicationRoleManager(new RoleStore<IdentityRole>(context.Get<ApplicationDbContext>()));
}
}


.

StartUP:

using System;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.Owin;
using Microsoft.Owin;
using Microsoft.Owin.Security.Cookies;
using Microsoft.Owin.Security.Google;
using Owin;
using Identity_Work.Models;

namespace Identity_Work
{
public partial class Startup
{
public void ConfigureAuth(IAppBuilder app)
{
app.CreatePerOwinContext(ApplicationDbContext.Create);
app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
app.CreatePerOwinContext<ApplicationRoleManager>(ApplicationRoleManager.Create);
app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);
app.UseCookieAuthentication(new CookieAuthenticationOptions
{
AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
LoginPath = new PathString("/Account/Login"),
Provider = new CookieAuthenticationProvider
{
OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
validateInterval: TimeSpan.FromMinutes(30),
regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager))
}
});
app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie); app.UseTwoFactorSignInCookie(DefaultAuthenticationTypes.TwoFactorCookie, TimeSpan.FromMinutes(5)); app.UseTwoFactorRememberBrowserCookie(DefaultAuthenticationTypes.TwoFactorRememberBrowserCookie);
}
}
}


.
Web Config :

<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
<add key="owin:AppStartup" value="Identity_Work.IdentityConfig" />




Controller :

[AllowAnonymous]
public ActionResult Register()
{
ViewBag.name = new SelectList(db.Roles, "RoleID", "RoleName");

return View();
}


View :

<div class="form-group">
<label>نوع عضویت</label>
<div class="col-md-10">
@Html.DropDownList("name", "--Select Name--")
</div>
</div>


but when i run the project show me this error :


The following errors occurred while attempting to load the app.
- The OwinStartupAttribute.FriendlyName value '' does not match the given value 'Identity_Work.IdentityConfig' in Assembly 'Identity_Work, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
- The given type or method 'Identity_Work.IdentityConfig' was not found. Try specifying the Assembly.
To disable OWIN startup discovery, add the appSetting owin:AutomaticAppStartup with a value of "false" in your web.config.
To specify the OWIN startup Assembly, Class, or Method, add the appSetting owin:AppStartup with the fully qualified startup class or configuration method name in your web.config.


. whats the problem ?

Edit

enter image description here

Answer

Like the error message explains

The OwinStartupAttribute.FriendlyName value '' does not match the given value 'Identity_Work.IdentityConfig'

Follow the instruction of the error message

The given type or method 'Identity_Work.IdentityConfig' was not found. Try specifying the Assembly. To disable OWIN startup discovery, add the appSetting owin:AutomaticAppStartup with a value of "false" in your web.config. To specify the OWIN startup Assembly, Class, or Method, add the appSetting owin:AppStartup with the fully qualified startup class or configuration method name in your web.config.

First You should check Startup.cs to see if it has the correct reference to the class

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

If it does then you need to remove owin:AppStartup in web.config if it exists and is not referencing the correct class

<add key="owin:AutomaticAppStartup" value="true" />

Otherwise you can update the web.config to let owin use

<add key="owin:AutomaticAppStartup" value="false" />
<add key="owin:AppStartup" value="Identity_Work.Startup" />