The non-public property '_callback' on type 'SpawnDev.BlazorJS.Callback' is annotated with 'JsonIncludeAttribute' which is invalid.

[PineCone5]

Describe the bug According to the instructions, the following snippet is added to the 'Counter' component :

   protected override Task OnInitializedAsync()
    {
        Js.Set("testCallback", Callback.Create((string strArg) => {
            Console.WriteLine($"Javascript sent: {strArg}");
            // this prints "Hello callback!"
        }));
        return base.OnInitializedAsync();
    }

But when run it, get an error with the following message:

Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: The non-public property '_callback' on type 'SpawnDev.BlazorJS.Callback' is annotated with 'JsonIncludeAttribute' which is invalid.
System.InvalidOperationException: The non-public property '_callback' on type 'SpawnDev.BlazorJS.Callback' is annotated with 'JsonIncludeAttribute' which is invalid.
   at System.Text.Json.ThrowHelper.ThrowInvalidOperationException_JsonIncludeOnNonPublicInvalid(String memberName, Type declaringType)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type, JsonConverter converter, Type runtimeType, JsonSerializerOptions options)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type, JsonSerializerOptions options)
   at System.Text.Json.JsonSerializerOptions.<InitializeForReflectionSerializer>g__CreateJsonTypeInfo|112_0(Type type, JsonSerializerOptions options)
   at System.Text.Json.JsonSerializerOptions.GetClassFromContextOrCreate(Type type)
   at System.Text.Json.JsonSerializerOptions.GetOrAddClass(Type type)
   at System.Text.Json.WriteStackFrame.InitializeReEntry(Type type, JsonSerializerOptions options)
   at System.Text.Json.Serialization.JsonConverter`1[[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TryWrite(Utf8JsonWriter writer, Object& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.Converters.ArrayConverter`2[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].OnWriteResume(Utf8JsonWriter writer, Object[] array, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonCollectionConverter`2[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].OnTryWrite(Utf8JsonWriter writer, Object[] value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TryWrite(Utf8JsonWriter writer, Object[]& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TryWriteAsObject(Utf8JsonWriter writer, Object value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1[[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TryWrite(Utf8JsonWriter writer, Object& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.Converters.ArrayConverter`2[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].OnWriteResume(Utf8JsonWriter writer, Object[] array, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonCollectionConverter`2[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].OnTryWrite(Utf8JsonWriter writer, Object[] value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TryWrite(Utf8JsonWriter writer, Object[]& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1[[System.Object[], System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].WriteCore(Utf8JsonWriter writer, Object[]& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.JsonSerializer.WriteUsingSerializer[Object[]](Utf8JsonWriter writer, Object[]& value, JsonTypeInfo jsonTypeInfo)
   at System.Text.Json.JsonSerializer.WriteStringUsingSerializer[Object[]](Object[]& value, JsonTypeInfo jsonTypeInfo)
   at System.Text.Json.JsonSerializer.Serialize[Object[]](Object[] value, JsonSerializerOptions options)
   at Microsoft.JSInterop.JSInProcessRuntime.Invoke[IJSVoidResult](String identifier, Int64 targetInstanceId, Object[] args)
   at Microsoft.JSInterop.JSInProcessRuntime.Invoke[IJSVoidResult](String identifier, Object[] args)
   at Microsoft.JSInterop.JSInProcessRuntimeExtensions.InvokeVoid(IJSInProcessRuntime jsRuntime, String identifier, Object[] args)
   at SpawnDev.BlazorJS.BlazorJSInterop._invokeVoid(String fnName, Object[] args) in D:\users\tj\Projects\SpawnDev.BlazorJS\SpawnDev.BlazorJS\SpawnDev.BlazorJS\BlazorJSInterop.cs:line 290
   at SpawnDev.BlazorJS.BlazorJSInterop.invokeVoid(String fnName, Object arg1, Object arg2) in D:\users\tj\Projects\SpawnDev.BlazorJS\SpawnDev.BlazorJS\SpawnDev.BlazorJS\BlazorJSInterop.cs:line 274
   at SpawnDev.BlazorJS.BlazorJSInterop.GlobalPropertySet(Object key, Object value) in D:\users\tj\Projects\SpawnDev.BlazorJS\SpawnDev.BlazorJS\SpawnDev.BlazorJS\BlazorJSInterop.cs:line 85
   at SpawnDev.BlazorJS.BlazorJSRuntime.Set(String key, Object value) in D:\users\tj\Projects\SpawnDev.BlazorJS\SpawnDev.BlazorJS\SpawnDev.BlazorJS\BlazorJSRuntimeExt.cs:line 55
   at BlazorApp2.Client.Pages.Counter.OnInitializedAsync() in C:\Users\admin\source\repos\BlazorApp2\BlazorApp2\Client\Pages\Counter.razor:line 16
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync()

To Reproduce Steps to reproduce the behavior:

1. Create a Blazor WebAssembly App using visual studio 2022.
2. Add 'SpawnDev.BlazorJS' nuget package.
3. Override 'OnInitializedAsync' in the 'Counter' component .
4. Run the app.
5. See error

Expected behavior Follow the instructions to work properly.

Screenshots

Desktop (please complete the following information):

• OS: Windows 10
• Browser : Microsoft Edge(127.0.2651.98)
• Version : SpawnDev.BlazorJS 2.5.6
• .net : .net 6.0

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.

[LostBeard]

Thank you. As you found, JsonIncludeAtribute is not valid on non-public properties in .Net 6 (and apparently also .Net 7.) I did not catch it because it does not throw a build error and it is valid on non-public properties in .Net 8.... which is where I have been working with Blazor JS the most.

I will get this fixed now, and check if I made this same mistake in any other places in the project.

Thank you for reporting this. 🚀

[LostBeard]

I found where this is mentioned. Adding for reference.

JsonIncludeAttribute class

In .NET 6 and .NET 7, non-public properties aren't supported.

Fixed in version 2.5.7

[PineCone5]

Thanks for your help! I have updated the version I used, and the program works fine. Thanks!