DateOnly passing to JSRuntime no longer supported in Blazor 6.0.0-rc.1

[naefp]

Describe the bug

System.Text.Json.Serialization.JsonConverter throws an exception when a DateOnly value is passed to JSRuntime in Blazor. The error occurs with 6.0.0-rc.1, but this worked in 6.0.0-preview.7.

Could be a bug or could be expected behavior, I'm not sure.

To Reproduce

Pass a DateOnly value to the JSRuntime in Blazor:

await JsRuntime.InvokeVoidAsync("your_js_function", YourDateOnlyValue);

Exceptions (if any)

crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Serialization and deserialization of 'System.DateOnly' instances are not supported and should be avoided since they can lead to security issues. The unsupported member type is located on type 'System.Object'. Path: $.
System.NotSupportedException: Serialization and deserialization of 'System.DateOnly' instances are not supported and should be avoided since they can lead to security issues. The unsupported member type is located on type 'System.Object'. Path: $.
 ---> System.NotSupportedException: Serialization and deserialization of 'System.DateOnly' instances are not supported and should be avoided since they can lead to security issues.
   at System.Text.Json.Serialization.Converters.DisallowedTypeConverter`1[[System.DateOnly, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Write(Utf8JsonWriter writer, DateOnly value, JsonSerializerOptions options)
   at System.Text.Json.Serialization.JsonConverter`1[[System.DateOnly, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TryWrite(Utf8JsonWriter writer, DateOnly& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1[[System.DateOnly, 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)
   --- End of inner exception stack trace ---
   at System.Text.Json.ThrowHelper.ThrowNotSupportedException(WriteStack& state, NotSupportedException ex)
   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.JSRuntime.InvokeAsync[Object](Int64 targetInstanceId, String identifier, CancellationToken cancellationToken, Object[] args)
   at Microsoft.JSInterop.JSRuntime.<InvokeAsync>d__16`1[[System.Object, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at Microsoft.JSInterop.JSRuntimeExtensions.InvokeVoidAsync(IJSRuntime jsRuntime, String identifier, Object[] args)

Further technical details

• ASP.NET Core version: 6.0.100-rc.1.21458.32

[TanayParikh]

This is a known issue:

• Add support for Date/TimeOnly to STJ runtime#51302
• Support DateOnly and TimeOnly in JsonSerializer runtime#53539

[simonziegler]

+1 this is an urgent requirement for me.

@danroth27 - I thought it might be worth tagging you for this. Lack of support for DateOnly and TimeOnly in STJ means that all Blazor JS Interop that relies on either type needs to be wrapped with a workaround.

[javiercn]

@simonziegler you can place a converter on the property and that will take effect.

[mkArtakMSFT]

We're closing this issue as there is no work we (the Blazor Team) have to do here to explicitly support this. There is an existing runtime issue tracking adding support for this for JsonSerializer.