Restore IActivityFactory and its implementation for backwards compatibility with 3.5.x, and register it in the DI container

src/modules/Elsa.Workflows.Core/Contracts/IActivityFactory.cs

@@ -0,0 +1,9 @@
+using Elsa.Workflows.Models;
+
+namespace Elsa.Workflows;
+
+[Obsolete("Use the CreateActivity method on the ActivityConstructorContext context itself")]
+public interface IActivityFactory
+{
+    IActivity Create(Type type, ActivityConstructorContext context);
+}

src/modules/Elsa.Workflows.Core/Features/WorkflowsFeature.cs

@@ -182,6 +182,7 @@ public class WorkflowsFeature : FeatureBase
             .AddScoped<IActivityRegistryLookupService, ActivityRegistryLookupService>()
             .AddSingleton<IPropertyDefaultValueResolver, PropertyDefaultValueResolver>()
             .AddSingleton<IPropertyUIHandlerResolver, PropertyUIHandlerResolver>()
+            .AddSingleton<IActivityFactory, ActivityFactory>()
             .AddTransient<WorkflowBuilder>()
             .AddScoped(typeof(Func<IWorkflowBuilder>), sp => () => sp.GetRequiredService<WorkflowBuilder>())
             .AddScoped<IWorkflowBuilderFactory, WorkflowBuilderFactory>()

src/modules/Elsa.Workflows.Core/Services/ActivityFactory.cs

@@ -0,0 +1,13 @@
+using Elsa.Workflows.Models;
+
+namespace Elsa.Workflows;
+
+/// <inheritdoc />
+public class ActivityFactory : IActivityFactory
+{
+    /// <inheritdoc />
+    public IActivity Create(Type type, ActivityConstructorContext context)
+    {
+        return context.CreateActivity(type);
+    }
+}