我個人測試, 它們結果是一樣的, 所以這裡< Sample >只是<Sample, Sample>的簡寫而已嗎? 謝謝

廣義來說結果是一樣的,詳細資訊可以看原始碼

下面是三個問題核心的 Method 實作

public static IServiceCollection AddScoped<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] TService>(this IServiceCollection services)
    where TService : class
{
    ThrowHelper.ThrowIfNull(services);

    return services.AddScoped(typeof(TService));
}

public static IServiceCollection AddScoped(
    this IServiceCollection services,
 [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type serviceType)
{
    ThrowHelper.ThrowIfNull(services);
    ThrowHelper.ThrowIfNull(serviceType);

    return services.AddScoped(serviceType, serviceType);
}

public static IServiceCollection AddScoped<TService, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] TImplementation>(this IServiceCollection services)
    where TService : class
    where TImplementation : class, TService
{
    ThrowHelper.ThrowIfNull(services);

    return services.AddScoped(typeof(TService), typeof(TImplementation));
}