[Blazor webasm] Please provide global way to set JSON serialization settings

[astrowalker]

When defaults suffice it is good and all but after some time one add some JSON converter (or switch to Newtonsoft), so please make life for Blazor client side equally easy as it is for server side. Namely please provide counterparts for those methods:

            services.AddControllers() // server side
                .AddJsonOptions(json => customization...))
                .AddNewtonsoftJson(json => customization...))
                ;

If you call the second or third method you will get serialization set once and for good. On the server side.

So it would be great to have something similar -- i.e. one call -- for Blazor client side.

[javiercn]

@astrowalker thanks for contacting us.

We don't plan to add more extensibility in this area, as it can affect the way Blazor fundamentally serializes some of its core messages and data structures and have a negative impact on the application performance, reliability (and even security) that is really hard to debug and troubleshoot.

That said, we offer efficient binary serialization since 6.0 and you can leverage that to build your own helper methods for serializing and deserializing data in whatever way you see fit, (whether that is JSON, protocol buffers, or any other serialization scheme). If you need that level of control, we recommend you do so for your app.

[mkArtakMSFT]

Thanks @javiercn. This is also related to #12685, where we basically said the same.