Some Code to Visualize your ASP.NET Core Dependencies

Startup1.cs

IServiceCollection _services; 
public void ConfigureServices(IServiceCollection services) 
{
  _services = services; 
  // rest omitted 
}

Startup2.cs

public void Configure(IApplicationBuilder app)//, IWebHostEnvironment env)
{
    // omitted code
    app.Map("/allservices", builder => builder.Run(async context =>
    {
        var sb = new StringBuilder();
        var dependencies = new Dictionary<string,string>();
        sb.AppendLine("<pre>");
        sb.AppendLine("digraph Services {");
        var services = _services.Select(svc => svc.ServiceType.ToString()).ToHashSet();

        foreach (var svc in _services)
        {
            var serviceName = svc.ServiceType.ToString();
            var implementationName = svc.ImplementationType?.ToString();
            if (implementationName != null)
            {
                var implDependencies = svc.ImplementationType.GetConstructors().SelectMany(cons => cons.GetParameters()).Select(p => p.ParameterType.ToString()).Distinct().Where(x => services.Contains(x));
                if (implDependencies.Count() > 0)
                {
                    // Register Constructor dependendencies
                    foreach(var d in implDependencies)
                    {
                        dependencies.TryAdd(implementationName, d);
                    }
                }
            }
        }
        Action<string, string, string, IEnumerable<string>> printGroup = (label, cluster, color, group) =>
        {
            if (group.Count() > 0)
            {
                sb.AppendLine($"  subgraph cluster_{cluster} {{");
                sb.AppendLine("      style = filled;");
                sb.AppendLine($"     color = {color};");
                sb.AppendLine("      node[style = filled, color = white];");
                sb.AppendLine($"     label = \"{label}\";");
                foreach (var item in group)
                {
                sb.AppendLine($"     \"{item}\"");
                }
                sb.AppendLine("  }");
            }
        };
        var scopedGroup = _services.Where(s => s.Lifetime == ServiceLifetime.Scoped).Select(s => s.ServiceType.ToString());
        var transientGroup = _services.Where(s => s.Lifetime == ServiceLifetime.Transient).Select(s => s.ServiceType.ToString());
        printGroup("scoped", "0", "blue", scopedGroup);
        printGroup("transient", "1", "lightgrey", transientGroup);
        // Make interfaces different
        sb.AppendLine();
        sb.AppendLine();
        sb.AppendLine("     node [color=green]");
        var interfacesGroup = _services.Where(s => s.ServiceType.IsInterface).Select(s => s.ServiceType.ToString());
        foreach (var @interface in interfacesGroup)
        {
            sb.AppendLine($"     \"{@interface}\"");
        }
        sb.AppendLine();
        sb.AppendLine("    node [color=black]");
        var noninterfacesGroup = _services.Where(s => !s.ServiceType.IsInterface).Select(s => s.ServiceType.ToString());
        foreach (var nonInterface in noninterfacesGroup)
        {
            sb.AppendLine($"     \"{nonInterface}\"");
        }
        //Now print dependencies
        foreach (var d in dependencies)
        {
            sb.AppendLine($"     \"{d.Key}\" -> \"{d.Value}\"");
        }
        sb.AppendLine("}");
        sb.AppendLine("</pre>");
        // Ok ready. Now return all the graph
        await context.Response.WriteAsync(sb.ToString());
    }));