Change MVC Home Landing Page: No service for type 'Microsoft.Extensions.DependencyInjection.IServiceCollection' has been registered

Question

I tried changing the landing page of my web page mvc application using this command.

I received this error below. How would I resolve it?

    public void Configure(IServiceCollection services, IApplicationBuilder app, IHostingEnvironment env)
    {


        app.AddMvc().AddRazorPagesOptions(options =>
        {
            options.Conventions.AddPageRoute("/Products/Index", "");
        });

Error:

InvalidOperationException: No service for type 'Microsoft.Extensions.DependencyInjection.IServiceCollection' has been registered.

Answer 1

Add a ConfigureServices method in order to configure services and DI:

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc().AddRazorPagesOptions(options =>
    {
        options.Conventions.AddPageRoute("/Products/Index", "");
    });
}

The Configure method should be used to configure the HTTP pipeline (ie app.UseMvc(); )

For further read, see App startup in ASP.NET Core