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
参考资料:
https://github.com/autofac/Autofac
https://autofac.readthedocs.io/en/latest/getting-started/index.html
https://autofac.readthedocs.io/en/latest/configuration/xml.html