Issue with DLL of NuGet package.i have installed thinktecture.identityserver.core NuGet package in my solution.added DLL to gac.but it still shows error message "a strongly-named assembly is required"

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I have added Thinktecture.IdentityServer.Core nuget package.Also installed all other packages on which Thinktecture.IdentityServer.Core package depends.
Signed all assemblies using BrutalDev assembly signer.Added all assemblies to GAC.Now I add all nuget packages dll to Package section of solution.But it still gives me error

Could not load file or assembly 'Thinktecture.IdentityServer.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)

Any help will be appreciated.Thanks in Advance

What I have tried:

I have added all nuget packages dll to GAC.Add all dll to package section of solution.Also tried copy to local option for dll reference.

Posted 23-May-16 20:24pm

Jay Ahmedabad

Updated 23-May-16 20:38pm

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Mehdi Gholam · Answer 1 · 2016-05-23T20:38:00

Solution 1

The PublicKeyToken=null shows that the dll is not signed. Either get a signed version or resign it yourself.

c# - Is it possible to resign a signed .net dll with a different key pair? - Stack Overflow[^]
strongname - How do you programmatically (re)sign a .NET assembly with a strong name? - Stack Overflow[^]

Posted 23-May-16 20:38pm

Mehdi Gholam

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Jay Ahmedabad 24-May-16 3:22am

I tried to check either assembly is in GAC or not as follow

C:\Windows\system32>gacutil /l Thinktecture.IdentityServer.Core
Microsoft (R) .NET Global Assembly Cache Utility. Version 4.0.30319.33440
Copyright (c) Microsoft Corporation. All rights reserved.

The Global Assembly Cache contains the following assemblies:
Thinktecture.IdentityServer.Core, Version=1.0.0.0, Culture=neutral, PublicKeyT
oken=95df42fe70e34d1d, processorArchitecture=MSIL

Number of items = 1

As per above result assembly is in GAC.
Still at run time it gives error message

Could not load file or assembly 'Thinktecture.IdentityServer.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)

Mehdi Gholam 24-May-16 3:26am

One of your dlls is referencing the unsigned version. Open each dll you are using in Reflector and see which one it is, then recompile that dll to reference the signed version.

Jay Ahmedabad 24-May-16 5:08am

Thanks for your concern.I have seen all the dll into reflector and found all dll signed.Can you tell me from where I should refer dll after adding them in GAC.Currently I refer all dll from package folder And still getting above error.

Mehdi Gholam 24-May-16 5:15am

Check your project files and make sure the loading paths are correct, better still remove all references and add them again (signed versions).

Jay Ahmedabad 24-May-16 7:31am

Resigned all assemblies,Added to GAC,removed all references and added them again.But error remained same.Still not able to solve the issue

Mehdi Gholam 24-May-16 8:50am

Check the stack trace for the exception and see in which method you are getting the error then check the dlls.

Jay Ahmedabad 24-May-16 9:34am

I have a function to perform sign in for identity server users. I am passing usename and password parameter in that function.My code is as below

public void SignInIdSrv(string user, string pass)
{
var returnUrl = _context.Request.QueryString["returnUrl"];

if (WebAppServiceGateway.Instance.Authorize(user, pass, true))
{

_context.Response.RedirectLocation = returnUrl;
}
else
_context.Response.RedirectLocation = _context.Request.RawUrl;
}

error occurs at WebAppServiceGateway.Instance.Authorize(user, pass, true).

error message is "Could not load file or assembly 'Thinktecture.IdentityServer.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)"