Is there a way (and a point) to DI services on the client?

Question

    public class Program {
        public static async Task Main( string[] args ) {
            var builder = WebAssemblyHostBuilder.CreateDefault( args );
            builder.Services.AddSingleton<ClientDataAccess>();
            await builder.Build().RunAsync();
        }
    }

Why isn't this code working to add ClientDataAccess as a DI service in my clientside (WASM) Blazor? It doesn't matter if the service is an empty class, or whether I inject it as a singleton or not. It simply produces this exception:

InvalidOperationException: Cannot provide a value for property 'Data' on type 'MyProgram.Client.Components.MyEditor'. There is no registered service of type 'MyProgram.Client.Services.ClientDataAccess'.

This is for a .net 8 blazor web application that uses client (WASM) Blazor with server-side hosting and REST API.

Answer 1

The posted code should work for a standalone Wasm App.

When using the "Blazor Web App", with either rendermode WebAssembly or Auto, you will have to register the service twice: in both Program.cs files. You only have to implement it once, in the Client.

You will probably have to rethink what a Singleton ClientDataAccess can do in the client. Note that you will have 2 'singleton per platform' instances.