Fixes #2 by providing a proper implementation of GetServices that actually returns instances of those services instead of just a list of types.

DISandbox/Program.cs

@@ -12,6 +12,12 @@ class Service : IService {
     }
 }
 
+class AnotherService : IService {
+    public void Log(string message) {
+        Console.WriteLine($"[AnotherService] {message}");
+    }
+}
+
 interface IOtherService {
     public Guid Id { get; }
     
@@ -47,6 +53,7 @@ static class Program {
     static void Main(string[] args) {
         var container = new ServiceContainer()
             .AddSingleton<IService, Service>()
+            .AddTransient<IService, AnotherService>()
             .AddTransient<IOtherService, GuidService>()
             .AddTransient<GuidDependantService, GuidDependantService>();
 
@@ -55,5 +62,6 @@ static class Program {
         container.GetService<IOtherService>().ShowId();
         container.GetService<GuidDependantService>().LogWithId("Hello, sent from the dependency.");
         container.GetService<IService>().Log("Goodbye, Dependency Injection!");
+        var res = container.GetServices<IService>();
     }
 }

Syrette/ServiceContainer.cs

@@ -18,6 +18,14 @@ public class ServiceContainer {
         descriptors.Where(d => d.ServiceType == typeof(TServices))
             .Select(d => d.ImplementationType).ToList();
     
+    /// <summary>
+    /// Get all registered services for a given service type.
+    /// </summary>
+    /// <typeparam name="TService"></typeparam>
+    public List<TService> GetServices<TService>() where TService : class =>
+        descriptors.Where(d => d.ServiceType == typeof(TService))
+            .Select(d => (TService)GetService(d.ImplementationType)).ToList();
+
     /// <summary>
     /// Registers a singleton service with its implementation.
     /// </summary>