通过与泛型和覆盖反射调用的方法 [英] Invoking a method via reflection with generics and overrides

问题描述

我想调用在Unity容器RegisterType方法。 。RegisterType共有16重写（其中一些是参数有些类型）

我试图执行等价的：

  Container.RegisterType< IMyDataProvider，MockData.MockProvider>（MockData，新ContainerControlledLifetimeManager（））
  

使用实现getMethod（）是一个完全失败，所以最后我做这个丑陋的东西：

<$ p $ 。p> MethodInfo的registerTypeGeneric = Container.GetType（）的getMethods（BindingFlags.Public | BindingFlags.Instance）。
其中（P => p.ToString（）==Microsoft.P​​ractices.Unity.IUnityContainer RegisterType [TFrom，TTO（System.String，Microsoft.P​​ractices.Unity.LifetimeManager，Microsoft.P​​ractices.Unity。 InjectionMember []））FirstOrDefault（）;
MethodInfo的registerTypeSpecific = registerTypeGeneric.MakeGenericMethod（新类型[] {typeof运算（IMyDataProvider），Assembly.LoadFrom（MockData.dll）的GetType（MockData.MockProvider）。}）;
registerTypeSpecific.Invoke（集装箱，新的对象[] {MockData，新ContainerControlledLifetimeManager（）}）;


和本精美的作品，直到它抱怨，因为我没有InjectionMember参数调用（他们可选的，我没有任何放弃）。因此，根据文档，我必须使用Type.InvokeMember（）调用具有可选参数的方法

所以我这样做：

 粘合剂粘合=新BootstrapperBinder（）; 
 Container.GetType（）InvokeMember（RegisterType，
 BindingFlags.Instance |。BindingFlags.Public | BindingFlags.OptionalParamBinding | BindingFlags.InvokeMethod，
粘结剂，
集装箱，
新的对象[] {MockData，新ContainerControlledLifetimeManager（）}）; 
  

我BoostrapperBinder类做这样的：

 公众覆盖MethodBase BindToMethod（的BindingFlags bindingAttr，MethodBase []的比赛，裁判的对象[] ARGS，ParameterModifier []修饰符，System.Globalization.CultureInfo文化，字符串[]名称，出对象的状态）
 {
型mockProvider = Assembly.LoadFrom（MockData.dll）的GetType（MockData.MockProvider）; 
状态=新的对象（）; 
 MethodInfo的MI = Container.GetType（）的getMethods（BindingFlags.Public | BindingFlags.Instance）。 
其中（P => p.ToString（）==Microsoft.P​​ractices.Unity.IUnityContainer RegisterType [TFrom，TTO（System.String，Microsoft.P​​ractices.Unity.LifetimeManager，Microsoft.P​​ractices.Unity。 InjectionMember []））FirstOrDefault（）; 
返回mi.MakeGenericMethod（新类型[] {typeof运算（ICarrierApprovalDataChangeAccessorEndPoint），mockProvider}）; 
} 
  

是的，它的丑陋，但我只是用它为这个OEN情况下，这样它的工作。

现在的问题是，它仍然在抱怨缺少第三个参数。我不能传递null或Missing.Value要么，或者croaks。我试过与无BindingFlags.OptionalParamBinding。我难倒。

（编辑把代码中的Container.RegisterType例子）

解决方案

我最初的帖子中提到，我曾试图传递null作为第三个参数和应用嘶哑的声音。具体来说，它得到一个空引用异常，我应该已经了解了更加清晰。

解决的办法是通过新InjectionMember [0]，而不是空，所以调用（）应该是这个样子的：

  registerTypeSpecific.Invoke（集装箱，新的对象[] {MockData新ContainerControlledLifetimeManager（），新InjectionMember [0]}）; 
  

感谢杰森对他的帮助。他的样本送我失望，最终导致答案的路径。

I'm trying to invoke the RegisterType method in the Unity container. RegisterType has a total of 16 overrides (some of those are parameters some are types).

I'm trying to perform the equivalent of:

Container.RegisterType<IMyDataProvider, MockData.MockProvider>("MockData", new ContainerControlledLifetimeManager())

Using GetMethod() was a total failure, so I ended up doing this ugly thing:

     MethodInfo registerTypeGeneric = Container.GetType().GetMethods(BindingFlags.Public | BindingFlags.Instance).
        Where(p => p.ToString() == "Microsoft.Practices.Unity.IUnityContainer RegisterType[TFrom,TTo](System.String, Microsoft.Practices.Unity.LifetimeManager, Microsoft.Practices.Unity.InjectionMember[])").FirstOrDefault();
     MethodInfo registerTypeSpecific = registerTypeGeneric.MakeGenericMethod( new Type[] { typeof(IMyDataProvider), Assembly.LoadFrom("MockData.dll").GetType("MockData.MockProvider") });
     registerTypeSpecific.Invoke(Container, new object[] { "MockData", new ContainerControlledLifetimeManager() });

And this works beautifully, up until the Invoke which complains because I have no InjectionMember parameters (they're optional and I don't have any to give). So, according to the documentation, I have to use Type.InvokeMember() to call a method with optional parameters.

So I did this:

     Binder binder = new BootstrapperBinder();
     Container.GetType().InvokeMember("RegisterType",
        BindingFlags.Instance | BindingFlags.Public | BindingFlags.OptionalParamBinding | BindingFlags.InvokeMethod,
        binder,
        Container,
        new object[] { "MockData", new ContainerControlledLifetimeManager() });

My BoostrapperBinder class does this:

  public override MethodBase BindToMethod(BindingFlags bindingAttr, MethodBase[] match, ref object[] args, ParameterModifier[] modifiers, System.Globalization.CultureInfo culture, string[] names, out object state)
  {
     Type mockProvider = Assembly.LoadFrom("MockData.dll").GetType("MockData.MockProvider");
     state = new object();
     MethodInfo mi = Container.GetType().GetMethods(BindingFlags.Public | BindingFlags.Instance).
        Where(p => p.ToString() == "Microsoft.Practices.Unity.IUnityContainer RegisterType[TFrom,TTo](System.String, Microsoft.Practices.Unity.LifetimeManager, Microsoft.Practices.Unity.InjectionMember[])").FirstOrDefault();
     return mi.MakeGenericMethod(new Type[] { typeof(ICarrierApprovalDataChangeAccessorEndPoint), mockProvider });
  }

Yes, it's ugly, but I just use it for this oen case, so it does the job.

Now, the problem is, it's still complaining about the lack of a third parameter. I can't pass null or Missing.Value either, or it croaks. I've tried with and without BindingFlags.OptionalParamBinding. I'm stumped.

(Edited to put the Container.RegisterType example in code)

解决方案

My initial post mentioned that I had tried passing null as a 3rd parameter and that the app "croaked." Specifically, it was getting a null reference exception and I should have been more clear about that.

The solution was to pass "new InjectionMember[0]" instead of null, so the Invoke() should have looked like this:

registerTypeSpecific.Invoke(Container, new object[] { "MockData", new ContainerControlledLifetimeManager(), new InjectionMember[0] }); 

Thanks to Jason for his help. His sample sent me down the path that eventually led to the answer.

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