OptionsConfigurationServiceCollectionExtensions add options

Question

Hi,

I would like to change the OnTokenValidated event in authentication.
But do not know how to use the BinderOptions in OptionsConfigurationServiceCollectionExtensions.

public void ConfigureServices(IServiceCollection services)  
{  
    services.Configure<CookiePolicyOptions>(options =>  
    {  
        // This lambda determines whether user consent for non-essential cookies is needed for a given request.  
        options.CheckConsentNeeded = context => true;  
        options.MinimumSameSitePolicy = SameSiteMode.Unspecified;  
        // Handling SameSite cookie according to https://learn.microsoft.com/en-us/aspnet/core/security/samesite?view=aspnetcore-3.1  
        options.HandleSameSiteCookieCompatibility();  
    });  
  
    // Configuration to sign-in users with Azure AD B2C  
    services.AddMicrosoftIdentityWebAppAuthentication(Configuration, "AzureAdB2C");  
  
    services.AddControllersWithViews()  
        .AddMicrosoftIdentityUI();  
  
    services.AddRazorPages();  
  
    //Configuring appsettings section AzureAdB2C, into IOptions  
    services.AddOptions();  
    services.Configure<OpenIdConnectOptions>(Configuration.GetSection("AzureAdB2C"));  
}  

Say, if I want to change the sample code above to this one. Looks like I can't directly do this.

 services.Configure<OpenIdConnectOptions>(Configuration.GetSection("AzureAdB2C"), options => {  
               
             options.TokenValidationParameters.RoleClaimType = "roles";  
             options.Events.OnTokenValidated = (ctx) =>  
            {  
  
                var redirectUri = new Uri(ctx.Properties.RedirectUri, UriKind.RelativeOrAbsolute);  
                if (redirectUri.IsAbsoluteUri)  
                {  
                    ctx.Properties.RedirectUri = redirectUri.PathAndQuery;  
                }  

                var claimsIdentity = ctx.Principal?.Identity as ClaimsIdentity;  
                claimsIdentity?.AddClaim(new Claim(ClaimTypes.Role, "Admins"));  
                ServiceLocator.Current.GetInstance<ISynchronizingUserService>().SynchronizeAsync(claimsIdentity);  
                return Task.FromResult(0);  
            };  
        });