Retrieve the property attributes once when transforming schema nodes

Author: desjoerd

src/OpenApi/src/Services/Schemas/OpenApiSchemaService.cs

@@ -107,25 +107,26 @@ internal sealed class OpenApiSchemaService(
             }
             if (context.PropertyInfo is { AttributeProvider: { } attributeProvider })
             {
+                var propertyAttributes = attributeProvider.GetCustomAttributes(inherit: false);
                 var isInlinedSchema = schema[OpenApiConstants.SchemaId] is null;
                 if (isInlinedSchema)
                 {
-                    if (attributeProvider.GetCustomAttributes(inherit: false).OfType<ValidationAttribute>() is { } validationAttributes)
+                    if (propertyAttributes.OfType<ValidationAttribute>() is { } validationAttributes)
                     {
                         schema.ApplyValidationAttributes(validationAttributes);
                     }
-                    if (attributeProvider.GetCustomAttributes(inherit: false).OfType<DefaultValueAttribute>().LastOrDefault() is { } defaultValueAttribute)
+                    if (propertyAttributes.OfType<DefaultValueAttribute>().LastOrDefault() is { } defaultValueAttribute)
                     {
                         schema.ApplyDefaultValue(defaultValueAttribute.Value, context.TypeInfo);
                     }
-                    if (attributeProvider.GetCustomAttributes(inherit: false).OfType<DescriptionAttribute>().LastOrDefault() is { } descriptionAttribute)
+                    if (propertyAttributes.OfType<DescriptionAttribute>().LastOrDefault() is { } descriptionAttribute)
                     {
                         schema[OpenApiSchemaKeywords.DescriptionKeyword] = descriptionAttribute.Description;
                     }
                 }
                 else
                 {
-                    if (attributeProvider.GetCustomAttributes(inherit: false).OfType<DescriptionAttribute>().LastOrDefault() is { } descriptionAttribute)
+                    if (propertyAttributes.OfType<DescriptionAttribute>().LastOrDefault() is { } descriptionAttribute)
                     {
                         schema[OpenApiConstants.RefDescriptionAnnotation] = descriptionAttribute.Description;
                     }