How to place appsettings.json in RCL project to be consumed by Configuration of blazor wasm app

RCL projects do support web assets. See document.

I just want to configure the solution like Xamarin where an App logic and view project is shared by multiple native app projects. I have achieved this structure with RCL and Blazor hosting models only except for appsettings.json, for which the problem I met is Configuration system of each blazor hosting app wouldn't consume it.

as Blazor WASM does not support normal file I/O (it uses a special in-memory only file system), so .AddJsonFile() will not work. you need to use .AddJsonStream() instead. you will use HttpClient to get the stream:

var http = new HttpClient 
{ 
   BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) 
};
builder.Services.AddScoped(sp => http);

using var response = await http.GetAsync("settings.json");
using var stream = await response.Content.ReadAsStreamAsync();
builder.Configuration.AddJsonStream(stream);

https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/configuration?view=aspnetcore-8.0

@Bruce (SqlWork.com) Well, I think I have missed mentioning that Blazor wasm is not serviced from asp.net core server. It means I am not using render mode.

I tried similar approach but got 404 in development environment.

I tried the similar approach but got 404.

FYI, RCL is consumed by Blazor Wasm Standalone app, which is not serviced from asp.net core blazor web app, where your code would work.