在.net core中使用依赖注入是很常见的，最常见的我们会使用以下三种
services.AddScoped<TestIBLL, TestBLL>();services.AddSingleton<TestIBLL, TestBLL>();services.AddTransient<TestIBLL, TestBLL>();
当我们的业务层内容不多的时候这样写没有什么问题，但是加入有100个BLL呢，那样一个一
个加会很麻烦，每加一个就要多写一次，而且容易忘记漏掉。
那么我们的需求是让希望能够实现批量注入，并且可以按照不同的生命周期去实现自动注入，以避免每加一个业务类，就要写一次services.AddScoped<>();
我将通过反射来实现它。
周期 AddScoped AddSingleton AddTransient
/// <summary>/// Add Scoped/// </summary>/// <param name="services"></param>/// <param name="interfaceAssembly"></param>/// <param name="implementAssembly"></param>public static void AddScoped(this IServiceCollection services, Assembly interfaceAssembly, Assembly implementAssembly){var interfaces = interfaceAssembly.GetTypes().Where(t => t.IsInterface);var implements = implementAssembly.GetTypes();foreach (var item in interfaces){var type = implements.FirstOrDefault(x => item.IsAssignableFrom(x));if (type != null){services.AddScoped(item, type);}}}
/// <summary>/// Add AddSingleton/// </summary>/// <param name="services"></param>/// <param name="interfaceAssembly"></param>/// <param name="implementAssembly"></param>public static void AddSingleton(this IServiceCollection services, Assembly interfaceAssembly, Assembly implementAssembly){var interfaces = interfaceAssembly.GetTypes().Where(t => t.IsInterface);var implements = implementAssembly.GetTypes();foreach (var item in interfaces){var type = implements.FirstOrDefault(x => item.IsAssignableFrom(x));if (type != null){services.AddSingleton(item, type);}}}
/// <summary>/// Add AddTransient/// </summary>/// <param name="services"></param>/// <param name="interfaceAssembly"></param>/// <param name="implementAssembly"></param>public static void AddTransient(this IServiceCollection services, Assembly interfaceAssembly, Assembly implementAssembly){var interfaces = interfaceAssembly.GetTypes().Where(t => t.IsInterface);var implements = implementAssembly.GetTypes();foreach (var item in interfaces){var type = implements.FirstOrDefault(x => item.IsAssignableFrom(x));if (type != null){services.AddTransient(item, type);}}}
调用
services.AddTransient(Assembly.Load("xxx.IBll"), Assembly.Load("xxx.Bll"));
