Added a helper to retrieve all controllers and methods from an assembly

(%release-note:

- Added a helper class to retrieve all controllers and methods from an assembly

%)

src/DfE.CoreLibs.Utilities/DfE.CoreLibs.Utilities.csproj

@@ -16,4 +16,8 @@
 		</None>
 	</ItemGroup>
 
+	<ItemGroup>
+	  <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.2.5" />
+	</ItemGroup>
+
 </Project>

src/DfE.CoreLibs.Utilities/Helpers/ControllerHelper.cs

@@ -0,0 +1,28 @@
+using Microsoft.AspNetCore.Mvc;
+using System.Reflection;
+
+namespace DfE.CoreLibs.Utilities.Helpers
+{
+    /// <summary>
+    /// Retrieves all the controllers and their methods from the provided assembly.
+    /// </summary>
+    public static class ControllerHelper
+    {
+        public static IEnumerable<(Type Controller, MethodInfo Method)> GetAllControllerMethodsTuples(Assembly assembly)
+        {
+            var controllers = assembly.GetTypes()
+                .Where(type => typeof(ControllerBase).IsAssignableFrom(type));
+
+            foreach (var controller in controllers)
+            {
+                var methods = controller.GetMethods(BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly)
+                    .Where(m => m.IsPublic && !m.IsDefined(typeof(NonActionAttribute)));
+
+                foreach (var method in methods)
+                {
+                    yield return (controller, method);
+                }
+            }
+        }
+    }
+}