PR

Author: Oleksandr Poliakov

src/MongoDB.Driver/Linq/Linq3Implementation/Translators/ExpressionToAggregationExpressionTranslators/NewDictionaryExpressionToAggregationExpressionTranslator.cs

@@ -31,18 +31,17 @@ internal static class NewDictionaryExpressionToAggregationExpressionTranslator
         public static TranslatedExpression Translate(TranslationContext context, NewExpression expression)
         {
             var arguments = expression.Arguments;
-            IBsonSerializer keySerializer = null;
-            IBsonSerializer valueSerializer = null;
-
             var collectionExpression = arguments.Single();
             var collectionTranslation = ExpressionToAggregationExpressionTranslator.TranslateEnumerable(context, collectionExpression);
             AstExpression collectionTranslationAst;
 
             if (collectionTranslation.Serializer is IBsonArraySerializer bsonArraySerializer &&
                 bsonArraySerializer.TryGetItemSerializationInfo(out var itemSerializationInfo))
             {
-                if (itemSerializationInfo.Serializer is IRepresentationConfigurable representationConfigurable &&
-                    representationConfigurable.Representation == BsonType.Array)
+                IBsonSerializer keySerializer = null;
+                IBsonSerializer valueSerializer = null;
+
+                if (itemSerializationInfo.Serializer is IRepresentationConfigurable { Representation: BsonType.Array })
                 {
                     collectionTranslationAst = collectionTranslation.Ast;
                 }
@@ -76,8 +75,7 @@ public static TranslatedExpression Translate(TranslationContext context, NewExpr
                     throw new ExpressionNotSupportedException(expression, because: $"document serializer class {itemSerializationInfo.Serializer.GetType()} does not implement {nameof(IBsonDocumentSerializer)}");
                 }
 
-                if (keySerializer is not IRepresentationConfigurable representationConfigurableSerializer
-                    || representationConfigurableSerializer.Representation != BsonType.String)
+                if (keySerializer is not IRepresentationConfigurable { Representation: BsonType.String })
                 {
                     throw new ExpressionNotSupportedException(expression, because: "key did not serialize as a string");
                 }