Startup.cs

using CustomControlExample.AspNetCore.Services;
using DevExpress.AspNetCore;
using DevExpress.AspNetCore.Reporting;
using DevExpress.Utils;
using DevExpress.XtraReports.CustomControls;
using DevExpress.XtraReports.Web.Extensions;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace CustomControlExample.AspNetCore {
    public class Startup {
		public Startup(IConfiguration configuration, IWebHostEnvironment hostingEnvironment) {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services) {

            DeserializationSettings.RegisterTrustedClass(typeof(Report));
            DeserializationSettings.RegisterTrustedClass(typeof(DataSource));

            services.AddDevExpressControls();
            services.AddScoped<ReportStorageWebExtension, CustomReportStorageWebExtension>();
            services
                .AddMvc()
				.AddNewtonsoftJson();
            services.ConfigureReportingServices(configurator => {
                configurator.ConfigureReportDesigner(designerConfigurator => {
                    designerConfigurator.RegisterDataSourceWizardConfigFileConnectionStringsProvider();
                });
                configurator.ConfigureWebDocumentViewer(viewerConfigurator => {
                    viewerConfigurator.UseCachedReportSourceBuilder();
                });
            });
        }

		public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory) {
            DevExpress.XtraReports.Configuration.Settings.Default.UserDesignerOptions.DataBindingMode = DevExpress.XtraReports.UI.DataBindingMode.Expressions;
            app.UseDevExpressControls();
            if(env.IsDevelopment()) {
                app.UseDeveloperExceptionPage();
			} else {
                app.UseExceptionHandler("/Home/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }
            app.UseHttpsRedirection();

            app.UseStaticFiles();
			app.UseRouting();

            RoundedCustomControl.EnsureCustomBrick();
            SwissQRBillCustomControl.EnsureCustomBrick();

            app.UseAuthorization();
            app.UseEndpoints(endpoints => {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}