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

Question

I have a strategy to share App.razor from RCL project with Blazor hosting apps like Blazor Webassembly standalone app as a front-end app and Blazor hybrid apps as native apps.

I placed all assets into a RCL project(RCL) including appsettings.json file in RCL/wwwroot/ and configured it as Content and Copy.

Building RCL project moved it in RCL/bin/.../wwwroot/appsettings.json.

I added Blazor Webassembly standalone app(Wasm project) into the solution, set up project reference to RCL, removed its own appsettings.json and all razor files, and changed Wasm.Program.cs as below:

builder.RootComponents.Add("#app");
builder.RootComponents.Add("head::after");

After bulding the solution, I have also checked RCL's appsettings.json is placed in Wasm/bin/../wwwroot/.

However, the problem was the file was not included in the Configuration.

So, I tried adding this line in Wasm.Program but it wouldn't work.

builder.Configuration.AddJsonFile("_content/RCL/appsettings.json");

// or
// builder.Configuration.AddJsonFile("/appsettings.json");

tried also this in Wasm/wwwroot/index.html to see if the file is downloaded to browser cache but to fail.

How can I achieve my goal?

Answer

RCL projects do not support web assets by default. You need to add support. See

https://devblogs.microsoft.com/dotnet/build-client-web-assets-for-your-razor-class-library/

note: it not clear why the RCL would have its own app settings file. It should use defaults, and allow overriding via published settings.

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

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