Problem on localization

[sciencekiller]

I'm now using ant blazor to develop an app. Following to the document, I create a test project. I create a Resouces folder and Index.en.resx and Index.zh-CN.resx. In Program.cs, I added

builder.Services.AddInteractiveStringLocalizer();
builder.Services.AddLocalization(options =>
{
    options.ResourcesPath = "Resources";
});

When I try to inject IStringLocalizer, it refers to System.Index and I can't find MyProject.Resources.Index. What can I do?

Any help are appreciated! And feel free to ask me any detail!

[sciencekiller]

This project is newly-created and server-side. And I remember there was a csharp designer class when I was writing a WPF app last year. So need this app a designer class?