MyAvaloniaDemo/Extensions/ServiceCollectionExtensions.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using MyAvaloniaApp.Services;
using MyAvaloniaApp.ViewModels;
using ReactiveUI;
using Splat;
using System;

namespace MyAvaloniaApp.Extensions;

/// <summary>
/// 服务集合扩展方法
/// </summary>
public static class ServiceCollectionExtensions
{
    /// <summary>
    /// 添加 ReactiveUI 相关服务
    /// </summary>
    /// <param name="services">服务集合</param>
    /// <returns>服务集合</returns>
    public static IServiceCollection AddReactiveUI(this IServiceCollection services)
    {
        // 注册 ReactiveUI 相关服务
        services.AddSingleton<AppViewModel>();
        services.AddSingleton<IScreen>(provider => provider.GetRequiredService<AppViewModel>());
        
        return services;
    }
    
    /// <summary>
    /// 添加业务服务
    /// </summary>
    /// <param name="services">服务集合</param>
    /// <returns>服务集合</returns>
    public static IServiceCollection AddBusinessServices(this IServiceCollection services)
    {
        // 注册业务服务
        services.AddTransient<IDataService, DataService>();
        services.AddTransient<IApiService, ApiService>();
        
        // 注册资源服务
        services.AddSingleton<IResourceService, ResourceService>();
        
        return services;
    }
    
    /// <summary>
    /// 添加 ViewModel 服务
    /// </summary>
    /// <param name="services">服务集合</param>
    /// <returns>服务集合</returns>
    public static IServiceCollection AddViewModels(this IServiceCollection services)
    {
        // 注册 MainWindowViewModel，通过 AppViewModel 获取
        // 注意：需要先注册 AppViewModel
        services.AddTransient<MainWindowViewModel>(provider =>
        {
            var appViewModel = provider.GetRequiredService<AppViewModel>();
            return appViewModel.MainWindowViewModel;
        });
        
        return services;
    }
}