Give direct access to supported EventTypes.

props/common.props

@@ -8,7 +8,7 @@
     <PackageTags>qowaiv domain model</PackageTags>
     <Company>Qowaiv community</Company>
     <Copyright>Copyright © Qowaiv community 2013-current</Copyright>
-    <LangVersion>11.0</LangVersion>
+    <LangVersion>12.0</LangVersion>
     <Nullable>enable</Nullable>
     <!-- We ship package versions for obsolete target frameworks too -->
     <CheckEolTargetFramework>false</CheckEolTargetFramework>

src/Qowaiv.DomainModel/Aggregate.cs

@@ -1,4 +1,6 @@
-namespace Qowaiv.DomainModel;
+using System.Reflection;
+
+namespace Qowaiv.DomainModel;
 
 /// <summary>Factory method for creating <see cref="Aggregate{TAggregate, TId}"/> from stored events.</summary>
 public static class Aggregate
@@ -23,4 +25,22 @@ public static TAggregate FromStorage<TAggregate, TId>(EventBuffer<TId> buffer)
         aggregate.Replay(buffer);
         return aggregate;
     }
+
+    /// <inheritdoc cref="EventDispatcher.SupportedEventTypes" />
+    [Pure]
+    public static ReadOnlySet<Type> SupportedEventTypes<TAggregate>()
+        where TAggregate : Aggregate<TAggregate>, new()
+    {
+        return Dispatcher(new TAggregate()).SupportedEventTypes;
+
+        EventDispatcher Dispatcher(TAggregate aggregate)
+            => (EventDispatcher)typeof(TAggregate)
+                .GetProperty(nameof(Dispatcher), NonPublic)!
+                .GetValue(aggregate)!;
+    }
+
+#pragma warning disable S3011 // Reflection should not be used to increase accessibility of classes, methods, or fields
+    // We own the code.
+    private const BindingFlags NonPublic = BindingFlags.Instance | BindingFlags.NonPublic;
+#pragma warning restore S3011 // Reflection should not be used to increase accessibility of classes, methods, or fields
 }

src/Qowaiv.DomainModel/Qowaiv.DomainModel.csproj

@@ -5,8 +5,10 @@
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;net5.0;net6.0;net7.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <Version>1.0.1</Version>
+    <Version>1.0.2</Version>
     <PackageReleaseNotes>
+v1.0.2
+- Expose supported event types via Aggregate.SupportedEventTypes().
 v1.0.1
 - Reintroduce If() on Then(). #40
 v1.0.0

test/Qowaiv.DomainModel.UnitTests/Supported_EventTypes_specs.cs

@@ -0,0 +1,19 @@
+using Qowaiv.DomainModel;
+
+namespace Supported_EventTypes_specs;
+
+public class Exposes
+{
+    [Test]
+    public void Supported_EventTypes_of_protected_dispatcher()
+    {
+        Aggregate.SupportedEventTypes<SimpleEventSourcedAggregate>()
+            .Should().BeEquivalentTo(
+            [
+                typeof(NameUpdated),
+                typeof(DateOfBirthUpdated),
+                typeof(SimpleInitEvent),
+                typeof(InvalidEvent),
+            ]);
+    }
+}