C# Xamarin使用Microsoft.Extensions.DependencyInjection形成依赖项注入

我正在尝试使用标准的Microsoft.Extensions.DependencyInjection NuGet包设置基本DI

目前我正在注册我的依赖项，如下所示：

public App()
{
    InitializeComponent();
    var serviceCollection = new ServiceCollection();
    ConfigureServices(serviceCollection);
}

private static void ConfigureServices(ServiceCollection serviceCollection)
{
    serviceCollection.AddSingleton<IRestClient>(_ => new RestClient("https://localhost:44379/api/"));
    serviceCollection.AddScoped<ICommHubClient, CommHubClient>();
}

 public ChatListViewModel(
        ICommHubClient client,
        IRestClient restClient
        )

在页面（.xaml.cs）的代码隐藏文件中，我需要提供viewModel，但也需要提供其中的依赖项

public ChatListPage()
{
     InitializeComponent();
     BindingContext = _viewModel = new ChatListViewModel(); //CURRENTLY THROWS ERROR BECAUSE NO DEPENDENCIES ARE PASSED!
}

---

是否有人知道我如何在Xamarin表单中使用Microsoft.Extensions.DependencyInjection应用依赖项注入（注册和解析）？

您还应该在DI容器中注册ViewModels，而不仅仅是您的服务：

在

App.xaml.cs

中将代码更改为：

public ServiceProvider ServiceProvider { get; }

public App()
{
    InitializeComponent();
    
    var serviceCollection = new ServiceCollection();
    ConfigureServices(serviceCollection);
    ServiceProvider = serviceCollection.BuildServiceProvider();
    
    MainPage = new ChatListPage();
}

private void ConfigureServices(ServiceCollection serviceCollection)
{
    serviceCollection.AddSingleton<IRestClient>(_ => new RestClient("https://localhost:44379/api/"));
    serviceCollection.AddScoped<ICommHubClient, CommHubClient>();
    serviceCollection.AddTransient<ChatListViewModel>();
}

---

您还应该在DI容器中注册ViewModels，而不仅仅是您的服务：

在

App.xaml.cs

中将代码更改为：

public ServiceProvider ServiceProvider { get; }

public App()
{
    InitializeComponent();
    
    var serviceCollection = new ServiceCollection();
    ConfigureServices(serviceCollection);
    ServiceProvider = serviceCollection.BuildServiceProvider();
    
    MainPage = new ChatListPage();
}

private void ConfigureServices(ServiceCollection serviceCollection)
{
    serviceCollection.AddSingleton<IRestClient>(_ => new RestClient("https://localhost:44379/api/"));
    serviceCollection.AddScoped<ICommHubClient, CommHubClient>();
    serviceCollection.AddTransient<ChatListViewModel>();
}

---

同时添加页面并将视图模型作为构造函数arg放置，以便同时注入视图模型。同时添加页面并将视图模型作为构造函数arg放置，以便同时注入视图模型。