.NET Core IServiceCollection注入 拓展方法

一般注入比较麻烦，可以不依赖第三方组件命名空间注入

• using Microsoft.Extensions.DependencyInjection;
• using Newtonsoft.Json;
• using System.Reflection;

public static class ServiceCollectionExtensions
{
    public static IServiceCollection AddTransientFromNamespace(
        this IServiceCollection services,
        string namespaceName,
        params Assembly[] assemblies
    )
    {
        foreach (Assembly assembly in assemblies)
        {
            IEnumerable<Type> types = assembly.GetTypes();
           
            types = types.Where(t => t.IsClass);
           
            Console.WriteLine(JsonConvert.SerializeObject(types));
            types = types.Where(x => (x.Namespace??"").StartsWith(namespaceName, StringComparison.InvariantCultureIgnoreCase));
            //types.Where(x =>
            //    x.IsClass
            //    && x.Namespace!.StartsWith(namespaceName, StringComparison.InvariantCultureIgnoreCase)
            //);

            foreach (Type? type in types)
            {
                if (services.All(x => x.ServiceType != type))
                {
                    _ = services.AddTransient(type);
                }
            }
        }

        return services;
    }

    public static IServiceCollection AddSingletonFromNamespace(
    this IServiceCollection services,
    string namespaceName,
    params Assembly[] assemblies
)
    {
        foreach (Assembly assembly in assemblies)
        {
            IEnumerable<Type> types = assembly
                .GetTypes()
                .Where(x =>
                    x.IsClass
                    && x.Namespace!.StartsWith(namespaceName, StringComparison.InvariantCultureIgnoreCase)
                );

            foreach (Type? type in types)
            {
                if (services.All(x => x.ServiceType != type))
                {
                    _ = services.AddSingleton(type);
                }
            }
        }

        return services;
    }


}

使用方法

  class AppAssembly
  {
      public static Assembly ExecutingAsssembly => Assembly.GetExecutingAssembly();
  }

 private static readonly IHost appHost = Host.CreateDefaultBuilder()
     .ConfigureAppConfiguration(c =>
     {
         c.SetBasePath(AppContext.BaseDirectory);
     })
     .ConfigureServices(
         (_, services) =>
         {
             services.AddLogging(loggerBuilder =>
             {
                 var nlog_configfile = Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, "NLog.config");
                 LogManager.Configuration = new XmlLoggingConfiguration(nlog_configfile);
                 NLog.ScopeContext.PushProperty("workername", "client");
                 loggerBuilder.ClearProviders();
                 loggerBuilder.AddNLog(LogManager.Configuration);
             });
			//  放类  IHostedService是后台服务类.NetCore功能
             services.AddHostedService<HostedService >();    
             //放接口与实现类    
 		     services.AddSingleton<IDemo, Demo>();
 		     //重点 ,命名空间注册...
             services.AddTransientFromNamespace("Demo.AAAA",AppAssembly.ExecutingAsssembly);    
    	     //重点 ,命名空间指定dll...
     	     var assemblyPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Demo.BBB.dll");
			 services.AddTransientFromNamespace("Demo.BBB", Assembly.LoadFrom(assemblyPath));
             services.BuildServiceProvider();

    }
) .Build();