net461 
namespace Microsoft.AspNet.Identity
{
    public static class IdentityExtensions
    {
        public static string FindFirstValue(this ClaimsIdentity identity, string claimType);
    }
}
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.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net461
Assembly

Microsoft.AspNet.Identity.Core , Version=2.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.Identity.Core.

Package Microsoft.AspNet.Identity.Core (2.2.4) net45
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  • Package-provided API