netcore依赖注入通过反射简化

aspnetcore里面用到许多的service，好多业务代码都要通过Service.AddScoped、Singleton、Transient等注入进去，类太多了写起来和管理起来都很麻烦，所以借鉴了一下github上面的项目稍微删减了一下下，最后会给出参考链接和git源代码。

项目结构如下，

这里面有些约定的东西一定要遵守，否则会出错，还有webapi必须要引用business和ibusiness，只引用ibusiness是不行的。

核心代码如下：

using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using My.Project.Ioc.Core.IService;

namespace My.Project.Ioc.Core.Extensions
{
    public static partial class ServiceExtensions
    {
        /// <summary>
        /// 自动注入拥有ITransientDependency,IScopeDependency或ISingletonDependency的类
        /// </summary>
        /// <param name="services">服务集合</param>
        /// <returns></returns>
        public static IServiceCollection AddFxServices(this IServiceCollection services)
        {
            Dictionary<Type, ServiceLifetime> lifeTimeMap = new Dictionary<Type, ServiceLifetime>
            {
                { typeof(ITransientDependency), ServiceLifetime.Transient},
                { typeof(IScopedDependency),ServiceLifetime.Scoped},
                { typeof(ISingletonDependency),ServiceLifetime.Singleton}
            };

            GlobalData.AllFxTypes.ForEach(aType =>
            {
                lifeTimeMap.ToList().ForEach(aMap =>
                {
                    var theDependency = aMap.Key;
                    if (theDependency.IsAssignableFrom(aType) && theDependency != aType && !aType.IsAbstract && aType.IsClass)
                    {
                        //注入实现
                        services.Add(new ServiceDescriptor(aType, aType, aMap.Value));

                        var interfaces = GlobalData.AllFxTypes.Where(x => x.IsAssignableFrom(aType) && x.IsInterface && x != theDependency).ToList();
                        //有接口则注入接口
                        if (interfaces.Count > 0)
                        {
                            interfaces.ForEach(aInterface =>
                            {                             
                                services.Add(new ServiceDescriptor(aInterface, serviceProvider => serviceProvider.GetService(aType), aMap.Value));
                            });
                        }
                        //无接口则注入自己
                        else
                        {
                            services.Add(new ServiceDescriptor(aType, aType, aMap.Value));
                        }
                    }
                });
            });

            return services;
        }
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace My.Project.Ioc.Core
{
    public static class GlobalData
    {
        static GlobalData()
        {
            string rootPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            AllFxAssemblies = Directory.GetFiles(rootPath, "*.dll")
                .Where(x => new FileInfo(x).Name.Contains(FXASSEMBLY_PATTERN))
                .Select(x => Assembly.LoadFrom(x))
                .Where(x => !x.IsDynamic)
                .ToList();

            AllFxAssemblies.ForEach(aAssembly =>
            {
                try
                {
                    AllFxTypes.AddRange(aAssembly.GetTypes());
                }
                catch
                {

                }
            });
        }

        /// <summary>
        /// 解决方案程序集匹配名
        /// </summary>
        public const string FXASSEMBLY_PATTERN = "My.Project.Ioc";

        /// <summary>
        /// 解决方案所有程序集
        /// </summary>
        public static readonly List<Assembly> AllFxAssemblies;

        /// <summary>
        /// 解决方案所有自定义类
        /// </summary>
        public static readonly List<Type> AllFxTypes = new List<Type>();
    }
}

非核心代码如下：

参考项目Coldairarrow/Colder.Admin.AntdVue: Admin Fx Based On .NET 5 + Ant Design Vue (github.com) ,有兴趣的可以研究下非常不错。当然里面关于aop和缓存方面我有另外的项目例子可以加进去改造exercise/netcore.demo/AspNetCoreEntityFrameWork at master · liuzhixin405/exercise (github.com)