From c3a3d85f47d8ff23091f09f7ad2cb40d7ba402f4 Mon Sep 17 00:00:00 2001
From: Sipke Schoorstra <sipkeschoorstra@outlook.com>
Date: Wed, 23 Nov 2022 11:21:15 +0100
Subject: [PATCH] Only register browsable, concrete activity types

---
 .../Features/WorkflowManagementFeature.cs                | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs b/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs
index 413c6d75e..ffc893007 100644
--- a/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs
+++ b/src/modules/Elsa.Workflows.Management/Features/WorkflowManagementFeature.cs
@@ -1,3 +1,5 @@
+using System.ComponentModel;
+using System.Reflection;
 using Elsa.Common.Extensions;
 using Elsa.Common.Features;
 using Elsa.Expressions.Services;
@@ -41,7 +43,12 @@ public class WorkflowManagementFeature : FeatureBase
     
     public WorkflowManagementFeature AddActivitiesFrom<TMarker>()
     {
-        var activityTypes = typeof(TMarker).Assembly.GetExportedTypes().Where(x => typeof(IActivity).IsAssignableFrom(x)).ToList();
+        var activityTypes = typeof(TMarker).Assembly.GetExportedTypes().Where(x =>
+        {
+            var browsableAttr = x.GetCustomAttribute<BrowsableAttribute>();
+            var isBrowsable = browsableAttr == null || browsableAttr.Browsable; 
+            return typeof(IActivity).IsAssignableFrom(x) && !x.IsAbstract && !x.IsInterface && !x.IsGenericType && isBrowsable;
+        }).ToList();
         return AddActivities(activityTypes);
     }