autofac JSON文件配置

autofac是比较简单易用的IOC容器。下面我们展示如何通过json配置文件，来进行控制反转。

需要用到以下程序集。可以通过nugget分别安装

Microsoft.Extensions.Configuration.dll

Microsoft.Extensions.Configuration.Json

Autofac.Configuration.dll

注意，项目目标框架最好设置为.NET Framework 4.6.1及以上。因为Microsoft.Extensions.Configuration.dll，依赖.NETStandard2.0

下表列出了 .NET Standard 的所有版本及其支持的平台

AutofacExt帮助类

using Autofac;using Autofac.Configuration;using Microsoft.Extensions.Configuration;namespace autofacConsole{ public static class AutofacExt {  private static IContainer _container;  public static void InitAutofac()  {   // Add the configuration to the ConfigurationBuilder.   var config = new ConfigurationBuilder();   config.AddJsonFile("autofac.json");   // Register the ConfigurationModule with Autofac.   var module = new ConfigurationModule(config.Build());   var builder = new ContainerBuilder();   builder.RegisterModule(module);   // Set the dependency resolver to be Autofac.   _container = builder.Build();  }  /// <summary>  /// 从容器中获取对象  /// </summary>  /// <typeparam name="T"></typeparam>  public static T GetFromFac<T>()  {   return _container.Resolve<T>();   // return (T)DependencyResolver.Current.GetService(typeof(T));  }  public static T GetFromFac<T>(string name)  {   return _container.ResolveNamed<T>(name);  } }}

客户端调用

public interface IOutput {  void Write(string content); }
public class ConsoleOutput : IOutput {  public void Write(string content)  {   Console.WriteLine(content);  } }class Program {    static void Main(string[] args)  {   AutofacExt.InitAutofac();   var writer =AutofacExt.GetFromFac<IOutput>();   writer.WriteDate();   Console.ReadKey();  } }

json配置文件配置

Autofac.json

{ "defaultAssembly": "autofacConsole", "components": [ {  "type": "autofacConsole.ConsoleOutput, autofacConsole",  "services": [  {   "type": "autofacConsole.IOutput,autofacConsole"  }  ],  "instanceScope": "single-instance",  "injectProperties": true } ]}

设置为如果较新则复制