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：

 1 using Microsoft.Extensions.DependencyInjection;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.Linq;
 5 using System.Text;
 6 using System.Threading.Tasks;
 7 using My.Project.Ioc.Core.IService;
 8
 9 namespace My.Project.Ioc.Core.Extensions
10 {
11     public static partial class ServiceExtensions
12     {
13         /// <summary>
14         /// 自动注入拥有ITransientDependency,IScopeDependency或ISingletonDependency的类
15         /// </summary>
16         /// <param name="services">服务集合</param>
17         /// <returns></returns>
18         public static IServiceCollection AddFxServices(this IServiceCollection services)
19         {
20             Dictionary<Type, ServiceLifetime> lifeTimeMap = new Dictionary<Type, ServiceLifetime>
21             {
22                 { typeof(ITransientDependency), ServiceLifetime.Transient},
23                 { typeof(IScopedDependency),ServiceLifetime.Scoped},
24                 { typeof(ISingletonDependency),ServiceLifetime.Singleton}
25             };
26
27             GlobalData.AllFxTypes.ForEach(aType =>
28             {
29                 lifeTimeMap.ToList().ForEach(aMap =>
30                 {
31                     var theDependency = aMap.Key;
32                     if (theDependency.IsAssignableFrom(aType) && theDependency != aType && !aType.IsAbstract && aType.IsClass)
33                     {
34                         //注入实现
35                         services.Add(new ServiceDescriptor(aType, aType, aMap.Value));
36
37                         var interfaces = GlobalData.AllFxTypes.Where(x => x.IsAssignableFrom(aType) && x.IsInterface && x != theDependency).ToList();
38                         //有接口则注入接口
39                         if (interfaces.Count > 0)
40                         {
41                             interfaces.ForEach(aInterface =>
42                             {
43                                 services.Add(new ServiceDescriptor(aInterface, serviceProvider => serviceProvider.GetService(aType), aMap.Value));
44                             });
45                         }
46                         //无接口则注入自己
47                         else
48                         {
49                             services.Add(new ServiceDescriptor(aType, aType, aMap.Value));
50                         }
51                     }
52                 });
53             });
54
55             return services;
56         }
57     }
58 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Linq;
 5 using System.Reflection;
 6 using System.Text;
 7 using System.Threading.Tasks;
 8
 9 namespace My.Project.Ioc.Core
10 {
11     public static class GlobalData
12     {
13         static GlobalData()
14         {
15             string rootPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
16             AllFxAssemblies = Directory.GetFiles(rootPath, "*.dll")
17                 .Where(x => new FileInfo(x).Name.Contains(FXASSEMBLY_PATTERN))
18                 .Select(x => Assembly.LoadFrom(x))
19                 .Where(x => !x.IsDynamic)
20                 .ToList();
21
22             AllFxAssemblies.ForEach(aAssembly =>
23             {
24                 try
25                 {
26                     AllFxTypes.AddRange(aAssembly.GetTypes());
27                 }
28                 catch
29                 {
30
31                 }
32             });
33         }
34
35         /// <summary>
36         /// 解决方案程序集匹配名
37         /// </summary>
38         public const string FXASSEMBLY_PATTERN = "My.Project.Ioc";
39
40         /// <summary>
41         /// 解决方案所有程序集
42         /// </summary>
43         public static readonly List<Assembly> AllFxAssemblies;
44
45         /// <summary>
46         /// 解决方案所有自定义类
47         /// </summary>
48         public static readonly List<Type> AllFxTypes = new List<Type>();
49     }
50 }

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)