Use Array.Empty for parameterless filters (#41740)

Author: captainsafia

src/Http/Http.Extensions/src/RequestDelegateFactory.cs

@@ -56,6 +56,7 @@ public static partial class RequestDelegateFactory
     private static readonly MethodInfo ValueTaskOfTToValueTaskOfObjectMethod = typeof(RequestDelegateFactory).GetMethod(nameof(ValueTaskOfTToValueTaskOfObject), BindingFlags.NonPublic | BindingFlags.Static)!;
     private static readonly MethodInfo PopulateMetadataForParameterMethod = typeof(RequestDelegateFactory).GetMethod(nameof(PopulateMetadataForParameter), BindingFlags.NonPublic | BindingFlags.Static)!;
     private static readonly MethodInfo PopulateMetadataForEndpointMethod = typeof(RequestDelegateFactory).GetMethod(nameof(PopulateMetadataForEndpoint), BindingFlags.NonPublic | BindingFlags.Static)!;
+    private static readonly MethodInfo ArrayEmptyMethod = typeof(Array).GetMethod(nameof(Array.Empty), BindingFlags.Public | BindingFlags.Static)!;
 
     // Call WriteAsJsonAsync<object?>() to serialize the runtime return type rather than the declared return type.
     // https://docs.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-polymorphism
@@ -388,9 +389,12 @@ private static Expression CreateRouteHandlerInvocationContextBase(FactoryContext
         // In the event that a constructor matching the arity of the
         // provided parameters is not found, we fall back to using the
         // non-generic implementation of RouteHandlerInvocationContext.
+        Expression paramArray = factoryContext.BoxedArgs.Length > 0
+            ? Expression.NewArrayInit(typeof(object), factoryContext.BoxedArgs)
+            : Expression.Call(ArrayEmptyMethod.MakeGenericMethod(new Type[] { typeof(object) }));
         var fallbackConstruction = Expression.New(
             DefaultRouteHandlerInvocationContextConstructor,
-            new Expression[] { HttpContextExpr, Expression.NewArrayInit(typeof(object), factoryContext.BoxedArgs) });
+            new Expression[] { HttpContextExpr, paramArray });
 
         var arguments = new Expression[factoryContext.ArgumentExpressions.Length + 1];
         arguments[0] = HttpContextExpr;