diff --git a/sandbox/GeneratorSandbox/Program.cs b/sandbox/GeneratorSandbox/Program.cs
index 68d7f13..2c0db53 100644
--- a/sandbox/GeneratorSandbox/Program.cs
+++ b/sandbox/GeneratorSandbox/Program.cs
@@ -10,6 +10,8 @@
 //using Microsoft.Extensions.Options;
 //using ZLogger;
 
+
+
 //args = ["echo", "--msg", "zzzz"];
 
 //// IHostBuilder
@@ -145,6 +147,11 @@ namespace ConsoleAppFramework
 {
     internal static partial class ConsoleApp
     {
+        static void Foo()
+        {
+            var options = JsonSerializerOptions ?? System.Text.Json.JsonSerializerOptions.Default;
+        }
+
         //public static ConsoleAppBuilder Create(IServiceProvider serviceProvider)
         //{
         //    ConsoleApp.ServiceProvider = serviceProvider;
diff --git a/src/ConsoleAppFramework/ConsoleAppBaseCode.cs b/src/ConsoleAppFramework/ConsoleAppBaseCode.cs
index 5eb8469..3b6c71a 100644
--- a/src/ConsoleAppFramework/ConsoleAppBaseCode.cs
+++ b/src/ConsoleAppFramework/ConsoleAppBaseCode.cs
@@ -228,7 +228,8 @@ static bool TrySplitParse<T>(ReadOnlySpan<char> s, out T[] result)
         {
             try
             {
-                var type = (System.Text.Json.Serialization.Metadata.JsonTypeInfo<T[]>)JsonSerializerOptions.GetTypeInfo(typeof(T))!;
+                var options = JsonSerializerOptions ?? System.Text.Json.JsonSerializerOptions.Default;
+                var type = (System.Text.Json.Serialization.Metadata.JsonTypeInfo<T[]>)options.GetTypeInfo(typeof(T[]))!;
                 result = System.Text.Json.JsonSerializer.Deserialize<T[]>(s, type)!;
                 return true;
             }