abp/templates/wpf/src/MyCompanyName.MyProjectName/MyProjectNameModule.cs

using Microsoft.Extensions.DependencyInjection;
using Volo.Abp.Autofac;
using Volo.Abp.Modularity;

namespace MyCompanyName.MyProjectName;

[DependsOn(typeof(AbpAutofacModule))]
public class MyProjectNameModule : AbpModule
{
    public override void ConfigureServices(ServiceConfigurationContext context)
    {
        context.Services.AddSingleton<MainWindow>();
    }
}