调用REST API (使用实体框架)的windows应用程序如何使用EF生成的模型

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }
}

public class ProductService
{
    private readonly HttpClient _httpClient;
    private const string BaseUrl = "https://api.example.com/products";

    public ProductService(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }

    public async Task<IEnumerable<Product>> GetProductsAsync()
    {
        var response = await _httpClient.GetAsync(BaseUrl);
        response.EnsureSuccessStatusCode();
        var content = await response.Content.ReadAsStringAsync();
        return JsonConvert.DeserializeObject<IEnumerable<Product>>(content);
    }

    public async Task<Product> GetProductByIdAsync(int id)
    {
        var url = $"{BaseUrl}/{id}";
        var response = await _httpClient.GetAsync(url);
        response.EnsureSuccessStatusCode();
        var content = await response.Content.ReadAsStringAsync();
        return JsonConvert.DeserializeObject<Product>(content);
    }

    public async Task CreateProductAsync(Product product)
    {
        var content = new StringContent(JsonConvert.SerializeObject(product), Encoding.UTF8, "application/json");
        var response = await _httpClient.PostAsync(BaseUrl, content);
        response.EnsureSuccessStatusCode();
    }

    // 其他CRUD操作...
}

public class MainWindowViewModel
{
    private readonly ProductService _productService;

    public ObservableCollection<Product> Products { get; set; }

    public MainWindowViewModel(ProductService productService)
    {
        _productService = productService;
        Products = new ObservableCollection<Product>();
        LoadProducts();
    }

    private async void LoadProducts()
    {
        var products = await _productService.GetProductsAsync();
        Products.Clear();
        foreach (var product in products)
        {
            Products.Add(product);
        }
    }
}