CellularManagement/src/X1.Application/DependencyInjection.cs

using Microsoft.Extensions.DependencyInjection;
using MediatR;
using FluentValidation;
using CellularManagement.Application.Behaviours;
using Microsoft.Extensions.Configuration;


namespace CellularManagement.Application;

/// <summary>
/// 应用层依赖注入扩展
/// 负责注册应用层所需的所有服务
/// </summary>
public static class DependencyInjection
{
    /// <summary>
    /// 添加应用层服务
    /// 包括命令/查询处理、验证等服务
    /// </summary>
    /// <param name="services">服务集合</param>
    /// <param name="configuration">配置</param>
    /// <returns>服务集合</returns>
    public static IServiceCollection AddApplication(
        this IServiceCollection services,
        IConfiguration configuration)
    {
        ArgumentNullException.ThrowIfNull(services);
        ArgumentNullException.ThrowIfNull(configuration);

        // 获取当前程序集
        var assembly = typeof(DependencyInjection).Assembly;

        // 配置 MediatR 服务
        // 1. 注册程序集中的所有处理器
        // 2. 添加验证行为中间件，用于自动验证请求
        services.AddMediatR(configuration =>
            configuration
                .RegisterServicesFromAssembly(assembly)
                .AddOpenBehavior(typeof(ValidationBehaviour<,>)));

        // 注册验证器
        services.AddScoped(typeof(IPipelineBehavior<,>), typeof(ValidationBehaviour<,>));

        return services;
    }
}