How can I use cache in IdentityServer4?

[Demon520-coder]

In my project,I want to add the clientStoreCache,resourceStoreCache,corsCache. I have read the doc of setting cache from here http://docs.identityserver.io/en/release/topics/startup.html?highlight=AddClientStoreCache#in-memory-configuration-stores.
But it dosen't work. Is anyone can help me? Thank you!

public static IServiceCollection RegisterIdentityServer(this IServiceCollection services, IWebHostEnvironment environment, IdentityServerConfig serverConfig)
        {
            var jwtCertficate = serverConfig.Certificate["Jwt"];
            var currentAssemblyName = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;

            services.AddIdentityServer(op =>
            {
                if (environment.IsDevelopment())
                {
                    op.Events.RaiseErrorEvents = true;
                    op.Events.RaiseFailureEvents = true;
                    op.Events.RaiseInformationEvents = true;
                    op.Events.RaiseSuccessEvents = true;
                }
                else
                {
                    op.Discovery.ShowGrantTypes = false;
                    op.Discovery.ShowIdentityScopes = false;
                    op.Discovery.ShowApiScopes = false;
                }

                op.Authentication.CookieLifetime = TimeSpan.FromSeconds(Constants.CookieExpireIn);
                op.Authentication.CookieAuthenticationScheme = Constants.AuthenCookieName;

                op.AccessTokenJwtType = "jwt";
                op.Caching.ClientStoreExpiration = TimeSpan.FromMinutes(30);
                op.Caching.ResourceStoreExpiration = TimeSpan.FromMinutes(30);
                op.Caching.CorsExpiration = TimeSpan.FromMinutes(30);

            }).AddConfigurationStoreCache()
              .AddSigningCredential(new X509Certificate2(jwtCertficate.Path, jwtCertficate.Pwd))
              .AddProfileService<CustomeProfileService>()
              .AddResourceOwnerValidator<ResourceOwnerPasswordValidator>()
              .AddCustomTokenRequestValidator<CustomTokenValidator>()

              .AddConfigurationStore(op =>
                {
                    op.ConfigureDbContext = (db) =>
                    {
                        db.UseSqlServer(serverConfig.ConnectionString, sqlDb => sqlDb.MigrationsAssembly(currentAssemblyName));
                    };
                }).AddOperationalStore(op =>
                {
                    op.EnableTokenCleanup = serverConfig.TokenCleanup.EnableTokenCleanup;
                    op.TokenCleanupInterval = serverConfig.TokenCleanup.TokenCleanupInterval;
                    op.TokenCleanupBatchSize = serverConfig.TokenCleanup.TokenCleanupBatchSize;
                    op.ConfigureDbContext = (db) =>
                    {
                        db.UseSqlServer(serverConfig.ConnectionString, sqlDb => sqlDb.MigrationsAssembly(currentAssemblyName));
                    };
                });


            services.AddAuthentication(Constants.AuthenCookieName)
                    .AddCookie(Constants.AuthenCookieName, op =>
                    {
                        op.ExpireTimeSpan.Add(TimeSpan.FromSeconds(Constants.CookieExpireIn));
                    });

            return services;
        }

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