Added generic Ioc.GetService<T> method

Author: Sergio0694

Microsoft.Toolkit.Mvvm/DependencyInjection/Ioc.cs

@@ -78,6 +78,24 @@ public sealed class Ioc : IServiceProvider
             return provider!.GetService(serviceType);
         }
 
+        /// <summary>
+        /// Tries to resolve an instance of a specified service type.
+        /// </summary>
+        /// <typeparam name="T">The type of service to resolve.</typeparam>
+        /// <returns>An instance of the specified service, or <see langword="null"/>.</returns>
+        public T? GetService<T>()
+            where T : class
+        {
+            IServiceProvider? provider = this.serviceProvider;
+
+            if (provider is null)
+            {
+                ThrowInvalidOperationExceptionForMissingInitialization();
+            }
+
+            return (T?)provider!.GetService(typeof(T));
+        }
+
         /// <summary>
         /// Initializes the shared <see cref="IServiceProvider"/> instance.
         /// </summary>