• 注入实例获取


    /// <summary>
    /// 引擎实现类
    /// </summary>
    public class GeneralEngine : IEngine
    {
    private IServiceProvider _provider;
    public GeneralEngine(IServiceProvider provider)
    {
    this._provider = provider;
    }
    /// <summary>
    /// 构建实例
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <returns></returns>
    public T Resolve<T>()
    {
    return _provider.GetService<T>();
    }
    }

    /// <summary>
    /// 一个负责创建对象的引擎
    /// </summary>
    public interface IEngine
    {
    T Resolve<T>();
    }

    public class EngineContext
    {
    private static IEngine _engine;
    [MethodImpl(MethodImplOptions.Synchronized)]
    public static IEngine initialize(IEngine engine)
    {
    if (_engine == null)
    {
    _engine = engine;
    }
    return _engine;
    }
    /// <summary>
    /// 当前引擎
    /// </summary>
    public static IEngine Current
    {
    get
    {
    return _engine;
    }
    }
    }

    在startup中添加

    ServiceProvider serviceProvider = services.BuildServiceProvider();


    EngineContext.initialize(new GeneralEngine(serviceProvider));

    在cntrol中引用

    private ISaleListService saleService = EngineContext.Current.Resolve<ISaleListService>(); 

     

     

    3.3 View中使用

    在View中需要用@inject 再声明一下,起一个别名。
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    @using MilkStone.Services;
    @model MilkStone.Models.AccountViewModel.LoginViewModel
    @inject ILoginService<ApplicationUser>  loginService
    <!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head></head>
    <body>
      @loginService.GetUserName()
    </body>
    </html>

      

    3.4 通过 HttpContext来获取实例

    HttpContext下有一个RequestedService同样可以用来获取实例对象,不过这种方法一般不推荐。同时要注意GetService<>这是个范型方法,默认如果没有添加Microsoft.Extension.DependencyInjection的using,是不用调用这个方法的。
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    HttpContext.RequestServices.GetService<ILoginService<ApplicationUser>>();
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  • 原文地址:https://www.cnblogs.com/jyzjh/p/13198595.html
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