// Build a container with some registrations.
var containerBuilder = new ContainerBuilder();
containerBuilder.Register(ctx => "Hello");
var container = containerBuilder.Build();
// Attach a DotDiagnosticTracer to the container.
// Handle the OperationCompleted event to deal
// with the trace output.
var tracer = new DotDiagnosticTracer();
tracer.OperationCompleted += (sender, args) =>
{
  using var file = File.OpenWrite(Guid.NewGuid().ToString() + ".dot");
  using var writer = new StreamWriter(file);
  writer.WriteLine(args.TraceContent);
};
container.SubscribeToDiagnostics(tracer);
// Resolve some things and look at the graphs!
// You can use graphviz to render a PNG like:
// dot -T png -O filename.dot
using var scope = container.BeginLifetimeScope();
scope.Resolve<string>();