From c2d3f997e649a12b7dd185f48680dc1468dc7d73 Mon Sep 17 00:00:00 2001
From: Irvine Sunday <irochand@microsoft.com>
Date: Fri, 27 Sep 2024 11:36:14 +0300
Subject: [PATCH] Ensure unique parameters are added

---
 src/Microsoft.OpenApi/Services/OpenApiFilterService.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Microsoft.OpenApi/Services/OpenApiFilterService.cs b/src/Microsoft.OpenApi/Services/OpenApiFilterService.cs
index fcc2af0b2..bd351ce0e 100644
--- a/src/Microsoft.OpenApi/Services/OpenApiFilterService.cs
+++ b/src/Microsoft.OpenApi/Services/OpenApiFilterService.cs
@@ -112,7 +112,10 @@ public static OpenApiDocument CreateFilteredDocument(OpenApiDocument source, Fun
                     {
                         foreach (var parameter in result.Parameters)
                         {
-                            pathItem.Parameters.Add(parameter);
+                            if (!pathItem.Parameters.Contains(parameter))
+                            {
+                                pathItem.Parameters.Add(parameter);
+                            }                          
                         }
                     }
                 }