address more pr comments

Author: adelinowona

src/MongoDB.Driver/IndexKeysDefinitionBuilder.cs

@@ -487,20 +487,7 @@ public override BsonDocument Render(RenderArgs<TDocument> args)
         {
             var renderedField = _field.Render(args);
 
-            BsonValue value;
-            switch (_direction)
-            {
-                case SortDirection.Ascending:
-                    value = 1;
-                    break;
-                case SortDirection.Descending:
-                    value = -1;
-                    break;
-                default:
-                    throw new InvalidOperationException("Unknown value for " + typeof(SortDirection) + ".");
-            }
-
-            return new BsonDocument(renderedField.FieldName, value);
+            return new BsonDocument(renderedField.FieldName, _direction.Render());
         }
     }
 

src/MongoDB.Driver/SortDefinitionBuilder.cs

@@ -295,7 +295,7 @@ public override BsonDocument Render(RenderArgs<TDocument> args)
         {
             var renderedField = _field.Render(args);
 
-            return new BsonDocument(renderedField.FieldName, _direction.ToBsonValue());
+            return new BsonDocument(renderedField.FieldName, _direction.Render());
         }
     }
 
@@ -308,7 +308,7 @@ public ValueDirectionalSortDefinition(SortDirection direction)
             _direction = direction;
         }
 
-        internal override BsonValue RenderAsBsonValue(RenderArgs<TDocument> args) => _direction.ToBsonValue();
+        internal override BsonValue RenderAsBsonValue(RenderArgs<TDocument> args) => _direction.Render();
 
         public override BsonDocument Render(RenderArgs<TDocument> args)
         {

src/MongoDB.Driver/SortDirectionExtensions.cs

@@ -20,7 +20,7 @@ namespace MongoDB.Driver
 {
     internal static class SortDirectionExtensions
     {
-        internal static BsonValue ToBsonValue(this SortDirection direction)
+        internal static BsonValue Render(this SortDirection direction)
         {
             return direction switch
             {