Add ObjectSerializer registration in MongoDB persistence provider

Co-authored-by: danielgerlag <[email protected]>

Author: Copilot

src/providers/WorkflowCore.Persistence.MongoDB/Services/MongoPersistenceProvider.cs

@@ -27,6 +27,12 @@ public MongoPersistenceProvider(IMongoDatabase database)
 
         static MongoPersistenceProvider()
         {
+            // Register ObjectSerializer to allow deserialization of WorkflowCore types and user types
+            // This matches the pattern used in MongoDB tests which resolves serialization issues
+            BsonSerializer.TryRegisterSerializer(new ObjectSerializer(type =>
+                ObjectSerializer.DefaultAllowedTypes(type) || 
+                type.FullName?.StartsWith("WorkflowCore") == true));
+
             ConventionRegistry.Register(
                 "workflow.conventions",
                 new ConventionPack

src/samples/WorkflowCore.Sample04/Program.cs

@@ -33,8 +33,8 @@ private static IServiceProvider ConfigureServices()
             //setup dependency injection
             IServiceCollection services = new ServiceCollection();
             services.AddLogging();
-            services.AddWorkflow();
-            //services.AddWorkflow(x => x.UseMongoDB(@"mongodb://localhost:27017", "workflow"));
+            //services.AddWorkflow();
+            services.AddWorkflow(x => x.UseMongoDB(@"mongodb://localhost:27017", "workflow"));
             //services.AddWorkflow(x => x.UseSqlServer(@"Server=.;Database=WorkflowCore;Trusted_Connection=True;", true, true));
             //services.AddWorkflow(x => x.UsePostgreSQL(@"Server=127.0.0.1;Port=5432;Database=workflow;User Id=postgres;", true, true));
             //services.AddWorkflow(x => x.UseSqlite(@"Data Source=database.db;", true));