书接上回，介绍了.net core 读取配置文件的几种方式，本文学习Autofac的同时再次增加一种读取配置文件的方法。

本文介绍Auofac，一个优秀的.NET IOC框架

源码地址：https://github.com/autofac/Autofac

1、打开NuGet包管理器安装Autofac.Extensions.DependencyInjection包

2、Program.cs 启用Autofac

public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }
 
    public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
            .UseServiceProviderFactory(new AutofacServiceProviderFactory()) // 启用Autofac
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            });
}

3、Startup.cs 新增Autofac并初始化容器

// 一、autofac 新增
public ILifetimeScope AutofacContainer { get; private set; }
/// <summary>
/// 二、将内容直接注册到AutofacContainerBuilder中
/// </summary>
/// <param name="builder"></param>
public void ConfigureContainer(ContainerBuilder builder) 
{
}

// 三、autofac 新增 可选
AutofacContainer = app.ApplicationServices.GetAutofacRoot();
IoCContainer.InitContainer(AutofacContainer);

4、新建Autofac IOC 容器类

/// <summary>
/// Autofac IOC 容器
/// </summary>
public class IoCContainer 
{
	private static ILifetimeScope _container;
	/// <summary>
	/// 初始化容器
	/// </summary>
	/// <param name="services"></param>
	/// <returns></returns>
	public static void InitContainer(ILifetimeScope autofacContainer) 
	{
		_container = autofacContainer;
	}
	/// <summary>
	/// 从容器中获取对象 Resolve an instance of the default requested type from the container
	/// </summary>
	/// <typeparam name="T">类型</typeparam>
	/// <returns></returns>
	public static T Resolve<T>() 
	{
		return _container.Resolve<T>();
	}
}

5、新建读取配置文件工具类

/// <summary>
/// 配置文件读取操作
/// </summary>
public class Configs 
{
	private static readonly IConfiguration configuration;
	static Configs() 
	{
		configuration = IoCContainer.Resolve<IConfiguration>();
	}
	/// <summary>
	/// 根据Key获取数配置内容
	/// </summary>
	/// <param name="key"></param>
	/// <returns></returns>
	public static IConfigurationSection GetSection(string key) 
	{
		return configuration.GetSection(key);
	}
	/// <summary>
	/// 根据section和key获取配置内容
	/// </summary>
	/// <param name="section"></param>
	/// <param name="key"></param>
	/// <returns></returns>
	public static string GetConfigurationValue(string section, string key) 
	{
		return GetSection(section)?[key];
	}
	/// <summary>
	/// 根据Key获取数据库连接字符串
	/// </summary>
	/// <param name="key"></param>
	/// <returns></returns>
	public static string GetConnectionString(string key) 
	{
		return configuration.GetConnectionString(key);
	}
}

6、新建控制器，使用！读取配置的另一种方式来啦！

[ApiController]
[Route("[controller]")]
public class TestController : ControllerBase 
{
	/// <summary>
	/// 读取内容
	/// </summary>
	[HttpGet, HttpPost]
    public void GetContent() 
	{
		var url = Configs.GetSection("Setting:Url").Value; // http://localhost:8080/
		var name = Configs.GetConfigurationValue("Setting", "Name"); // localhost
	}
}

以上就是.net core AutoFac的简单学习使用 + 读取配置文件的新方式的介绍，做此记录，如有帮助，欢迎点赞关注收藏！