当我用常量值参数指定构造函数时，Ninject为什么坚持要绑定Bool？

Question

我遇到了一个N​​inject问题，我似乎不太能深入研究。也许您可以看到一些明显的我想念的东西。我收到一个绑定错误，它希望我为Bool绑定：

Ninject.ActivationException：激活布尔时出错没有匹配的绑定可用，并且类型不是自绑定的。激活路径：5）将依赖项布尔注入到SimulatorStateMachine类型的构造函数的参数realTime中4）将依赖项ISimulatorStateTriggers注入参数state中InputParser类型的构造函数的机器3）将依赖InputParser注入到SimulatorCommunicationsChannel类型的构造函数的参数解析器中2）将依赖项ICommunicationChannel注入到SimulatorContext类型的属性Channel中1）请求SimulatorContext意见建议：1）确保已为bool定义了绑定。2）如果绑定是在模块中定义的，请确保已将模块加载到内核中。3）确保您没有意外地创建了多个内核。4）如果使用构造函数参数，请确保参数名称与构造函数参数名称匹配。5）如果使用自动模块加载，请确保搜索路径和过滤器正确。在Ninject.KernelBase.Resolve（IRequest请求，布尔值handleMissingBindings）在Ninject.KernelBase.Resolve（IRequest请求）在Ninject.Planning.Targets.Target`1.ResolveWithin（IContext parent）处在Ninject.Activation.Providers.StandardProvider.GetValue（IContext上下文，ITarget目标）在Ninject.Activation.Providers.StandardProvider.c__DisplayClass15_0.b__0（ITarget目标）在System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext（）在System.Linq.Buffer`1..ctor（IEnumerable`1源）在System.Linq.Enumerable.ToArray [TSource]（IEnumerable`1源）处在Ninject.Activation.Providers.StandardProvider.Create（IContext上下文）在Ninject.Activation.Context.ResolveInternal（对象范围）在Ninject.Activation.Context.Resolve（）在Ninject.KernelBase.Resolve（IRequest请求，布尔值handleMissingBindings）在Ninject.KernelBase.Resolve（IRequest请求）在Ninject.Planning.Targets.Target`1.ResolveWithin（IContext parent）处在Ninject.Activation.Providers.StandardProvider.GetValue（IContext上下文，ITarget目标）在Ninject.Activation.Providers.StandardProvider.c__DisplayClass15_0.b__0（ITarget目标）在System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext（）在System.Linq.Buffer`1..ctor（IEnumerable`1源）在System.Linq.Enumerable.ToArray [TSource]（IEnumerable`1源）处在Ninject.Activation.Providers.StandardProvider.Create（IContext上下文）在Ninject.Activation.Context.ResolveInternal（对象范围）在Ninject.Activation.Context.Resolve（）在Ninject.KernelBase.Resolve（IRequest请求，布尔值handleMissingBindings）在Ninject.KernelBase.Resolve（IRequest请求）在Ninject.Planning.Targets.Target`1.ResolveWithin（IContext parent）处在Ninject.Activation.Providers.StandardProvider.GetValue（IContext上下文，ITarget目标）在Ninject.Activation.Providers.StandardProvider.c__DisplayClass15_0.b__0（ITarget目标）在System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext（）在System.Linq.Buffer`1..ctor（IEnumerable`1源）在System.Linq.Enumerable.ToArray [TSource]（IEnumerable`1源）处在Ninject.Activation.Providers.StandardProvider.Create（IContext上下文）在Ninject.Activation.Context.ResolveInternal（对象范围）在Ninject.Activation.Context.Resolve（）在Ninject.KernelBase.Resolve（IRequest请求，布尔值handleMissingBindings）在Ninject.KernelBase.Resolve（IRequest请求）在Ninject.Planning.Targets.Target`1.ResolveWithin（IContext parent）处在Ninject.Activation.Strategies.PropertyInjectionStrategy.GetValue（IContext上下文，ITarget目标，IEnumerable`1 allPropertyValues）在Ninject.Activation.Strategies.PropertyInjectionStrategy.Activate（IContext上下文，InstanceReference参考）在Ninject.Activation.Pipeline.c__DisplayClass6_0.b__0（IActivationStrategy s）在Ninject.Infrastructure.Language.ExtensionsForIEnumerableOfT.Map [T]（IEnumerable`1系列，Action`1操作）在Ninject.Activation.Pipeline.Activate（IContext上下文，InstanceReference参考）在Ninject.Activation.Context.ResolveInternal（对象范围）在Ninject.Activation.Context.Resolve（）在Ninject.KernelBase.Resolve（IRequest请求，布尔值handleMissingBindings）在Ninject.KernelBase.Resolve（IRequest请求）在Ninject.ResolutionExtensions.GetResolutionIterator（IResolutionRoot根，类型服务，Func`2约束，IEnumerable`1参数，布尔值isOptional，布尔值isUnique）在Ninject.ResolutionExtensions.Get [T]（IResolutionRoot根，IParameter []参数）在C：\ Users \ Tim \ source \ repos \ ta.snapcap \ TA.SnapCap.Specifications \ Contexts \ SimulatorTestContextBuilder.cs：line 44处的TA.SnapCap.Specifications.Contexts.SimulatorTestContextBuilder.Build（）在TA.SnapCap.Specifications.SimulatorSpecs.when_creating_a_fast_simulator.c.b__5_0（）在C：\ Users \ Tim \ source \ repos \ ta.snapcap \ TA.SnapCap.Specifications \ SimulatorSpecs \ CreationSpecs.cs：line 32

我不明白为什么需要它。正在构造的对象SimulatorStateMachine具有对使用bool参数使用常量值的构造函数的特定绑定。我也尝试使用.WithConstructorArgument()对此进行了变体。

下面包括我的整个作品根。如果我取消对Bind<bool>().ToConstant(false)行的注释，那么错误就消失了（但是如果这不是我所需要的行为）。所以很明显Ninject某种程度上不使用我指定的构造函数。你知道为什么会这样吗？我不能，我有点代码盲了...

using System;
using Ninject;
using Ninject.Modules;
using NodaTime;
using TA.Ascom.ReactiveCommunications;
using TA.SnapCap.HardwareSimulator;

namespace TA.SnapCap.Specifications.Contexts
    {
    class SimulatorTestContextBuilder : NinjectModule
        {
        private readonly IKernel testKernel = new StandardKernel();
        string connectionString = "Simulator:Fast";
        Action<SimulatorStateMachine>
            initializeStateMachine = machine => { }; // called to initialize the state machine. DO nothing by default.
        bool openChannel;

        /// <inheritdoc />
        public override void Load()
            {
            //Bind<bool>().ToConstant(false);
            Bind<SimulatorStateMachine>().ToMethod(ctx => new SimulatorStateMachine(true, SystemClock.Instance));
            Bind<IClock>().ToMethod(_ => SystemClock.Instance).InSingletonScope();
            Bind<SimulatorEndpoint>()
                .ToMethod(ctx => SimulatorEndpoint.FromConnectionString(connectionString))
                .InSingletonScope();
            Bind<DeviceEndpoint>().To<SimulatorEndpoint>().InSingletonScope();
            Bind<InputParser>().ToSelf().InSingletonScope();
            Bind<ISimulatorStateTriggers>().To<SimulatorStateMachine>().InSingletonScope();
            Bind<SimulatorCommunicationsChannel>().ToSelf().InSingletonScope();
            Bind<ICommunicationChannel>().To<SimulatorCommunicationsChannel>().InSingletonScope();
            Bind<SimulatorContext>().ToSelf().InSingletonScope();
            }

        public SimulatorContext Build()
            {
            testKernel.Load(this);
            var context = testKernel.Get<SimulatorContext>();
            context.SimulatorChannel.IsOpen = openChannel;
            initializeStateMachine(context.Simulator);
            return context;
            }

        public SimulatorTestContextBuilder WithFastSimulator()
            {
            connectionString = "Simulator:Fast";
            return this;
            }

        public SimulatorTestContextBuilder WithRealtimeSimulator()
            {
            connectionString = "Simulator:Realtime";
            return this;
            }

        public SimulatorTestContextBuilder WithOpenChannel()
            {
            openChannel = true;
            return this;
            }

        public SimulatorTestContextBuilder InClosedState()
            {
            initializeStateMachine = machine =>
                machine.Initialize(new StateClosed(machine), testKernel.Get<InputParser>());
            return this;
            }
        }
    }

Answer 1

问题在于您绑定了ISimulatorStateTriggers。应该是：

Bind<ISimulatorStateTriggers>()
  .ToMethod(ctx => new SimulatorStateMachine(yourChoiceOfBoolValue, SystemClock.Instance))
  .InSingletonScope();

SimulatorStateMachine的绑定仅在您要解析SimulatorStateMachine时使用，在此情况并非如此。在这种情况下，绑定不是构造函数的重载。