From 27018d615d3a9e16a78e0cfbcd1cc81344164a51 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 13 May 2026 19:43:17 +0000
Subject: [PATCH] Use TFM-specialized count check: TryGetNonEnumeratedCount for
 NET6+, ICollection pattern for NETFX

Agent-Logs-Url: https://github.com/microsoft/agent-framework/sessions/8ec28a43-e7b7-456e-8d8e-921511b4accc

Co-authored-by: lokitoth <6936551+lokitoth@users.noreply.github.com>
---
 .../WorkflowBuilderExtensions.cs                              | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowBuilderExtensions.cs b/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowBuilderExtensions.cs
index eeeaf63bc8..a771f89878 100644
--- a/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowBuilderExtensions.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowBuilderExtensions.cs
@@ -114,7 +114,11 @@ public static class WorkflowBuilderExtensions
 
         Func<object?, bool> predicate = WorkflowBuilder.CreateConditionFunc<TMessage>((Func<object?, bool>)IsAllowedType)!;
 
+#if NET6_0_OR_GREATER
         if (targets.TryGetNonEnumeratedCount(out int count) && count == 1)
+#else
+        if (targets is ICollection<ExecutorBinding> { Count: 1 })
+#endif
         {
             return builder.AddEdge(source, Throw.IfNull(targets.First(), nameof(targets)), predicate);
         }