Ninject Lazy Load问题-白红宇

Ninject Lazy Load问题

阅读量：6173 次

发布时间：2019-06-21

本文共 5433 字，大约阅读时间需要 18 分钟。

参考：

http://stackoverflow.com/questions/2538132/lazy-loading-with-ninject

方案一：

public class Module : NinjectModule{    public override void Load()    {        Bind(typeof(Lazy<>)).ToMethod(ctx =>                 GetType()                    .GetMethod("GetLazyProvider", BindingFlags.Instance | BindingFlags.NonPublic)                    .MakeGenericMethod(ctx.GenericArguments[0])                    .Invoke(this, new object[] { ctx.Kernel }));    }    protected Lazy
     
       GetLazyProvider
      
       (IKernel kernel)    {        return new Lazy
       
        (() => kernel.Get
        
         ());    }}

方案二：

namespace LayzyLoadTest{    [TestClass]    public class UnitTest1    {        private IKernel InitKernel()        {            Ninject.IKernel kernel = new Ninject.StandardKernel(new LazyBinding());            //kernel.Load
       
        ();            kernel.Bind
        
         ().To
         
          ();            kernel.Bind
          
           ().To
           
            ();            kernel.Bind
            
             ().To
             
              ().Named("comm"); kernel.Bind
              
               ().To
               
                ().Named("lazy"); return kernel; } [TestMethod] public void TestMethod1() { var comm = InitKernel().Get
                
                 ("comm"); comm.CurSpeed(); comm.ShowSpeed(); //Console.WriteLine("------------------------------------------------"); //var lazy = kernel.Get
                 
                  ("lazy"); lazy.CurSpeed(); lazy.ShowSpeed(); }

[TestMethod]        public void Lazy()        {            var lazy = InitKernel().Get
       
        ("lazy");            lazy.CurSpeed();            Console.WriteLine("----over curspeed--------------------");            lazy.ShowSpeed();        }    }}

namespace LayzyLoadTest.LayzyClasses{    #region Persons    interface IPerson    {        int RunSpeed();    }    class Child : IPerson    {        public Child()        {            Console.WriteLine("Ctor Child");        }        public int RunSpeed()        {            Console.WriteLine("Child's Speed");            return 100;        }    }    class Father : IPerson    {        public Father()        {            Console.WriteLine("Ctor Father");        }        public int RunSpeed()        {            Console.WriteLine("Father's Speed");            return 1000;        }    }    interface IVehicle    {        int Improve();    }    class Car : IVehicle    {        public Car()        {            Console.WriteLine("Car's Ctor");        }        public int Improve()        {            Console.WriteLine("Car Improve");            return 1000;        }    }    class Bicycle : IVehicle    {        public Bicycle()        {            Console.WriteLine("Bicycle's Ctor");        }        public int Improve()        {            Console.WriteLine("Bicycle Improve");            return 100;        }    }    #endregion    #region Place    interface IPlace    {        int CurSpeed();        int ShowSpeed();    }    class Road : IPlace    {        private readonly IPerson _person;        private readonly IVehicle _vehicle;        public Road(IPerson person, IVehicle vehicle)        {            Console.WriteLine(" Road's Ctor ");            _person = person;            _vehicle = vehicle;        }        public int CurSpeed()        {            Console.WriteLine("Road CurSpeed");            return _person.RunSpeed();        }        public int ShowSpeed()        {            Console.WriteLine("Road ShowSpeed");            return _person.RunSpeed() * _vehicle.Improve();        }    }    class LazyRoad : IPlace    {        private readonly Lazy
       
         _person;        private readonly Lazy
        
          _vehicle;        public LazyRoad(Lazy
         
           person, Lazy
          
            vehicle)        {            Console.WriteLine(" LazyRoad's Ctor ");            _person = person;            _vehicle = vehicle;        }        public int CurSpeed()        {            Console.WriteLine("LazyRoad CurSpeed");            return _person.Value.RunSpeed();        }        public int ShowSpeed()        {            Console.WriteLine("LazyRoad ShowSpeed");            return _person.Value.RunSpeed() * _vehicle.Value.Improve();        }    }    #endregion}

namespace LayzyLoadTest{    public class LazyBinding : NinjectModule    {        public override void Load()        {            this.Bind(typeof(Lazy<>))                .ToMethod(                    context =>                    ((ILazyLoader)Activator.CreateInstance(typeof(LazyLoader<>).MakeGenericType(context.GenericArguments),                                                           new object[] { context.Kernel })).Loader);        }        public interface ILazyLoader        {            object Loader { get; }        }        public class LazyLoader
       
         : ILazyLoader        {            private readonly IKernel _kernel;            private static readonly Func
        
         > _lazyLoader = k => new Lazy
         
          (() => k.Get
          
           ());            public LazyLoader(IKernel kernel)            {                if (kernel == null)                    throw new ArgumentNullException("kernel");                this._kernel = kernel;            }            public object Loader { get { return _lazyLoader(this._kernel); } }        }    }}