Support setting content types in ProducesResponseTypeAttribute to close #34542

Author: captainsafia

src/Mvc/Mvc.Core/src/ProducesResponseTypeAttribute.cs

@@ -33,6 +33,7 @@ public ProducesResponseTypeAttribute(Type type, int statusCode)
             Type = type ?? throw new ArgumentNullException(nameof(type));
             StatusCode = statusCode;
             IsResponseTypeSetByDefault = false;
+            ContentTypes = new();
         }
 
         /// <summary>
@@ -45,6 +46,11 @@ public ProducesResponseTypeAttribute(Type type, int statusCode)
         /// </summary>
         public int StatusCode { get; set; }
 
+        /// <summary>
+        /// Gets or sets the content types supported by the response.
+        /// </summary>
+        public MediaTypeCollection ContentTypes { get; set; }
+
         /// <summary>
         /// Used to distinguish a `Type` set by default in the constructor versus
         /// one provided by the user.
@@ -58,9 +64,9 @@ public ProducesResponseTypeAttribute(Type type, int statusCode)
         internal bool IsResponseTypeSetByDefault { get; }
 
         /// <inheritdoc />
-        void IApiResponseMetadataProvider.SetContentTypes(MediaTypeCollection contentTypes)
+        public void SetContentTypes(MediaTypeCollection contentTypes)
         {
-            // Users are supposed to use the 'Produces' attribute to set the content types that an action can support.
+            ContentTypes = contentTypes;
         }
     }
 }