获取在动态对象中调用方法的通用类型 [英] Get generic type of call to method in dynamic object

问题描述

我开始使用.Net中的动态对象，我无法弄清楚如何做某事。

我有一个继承自DynamicObject的类，我覆盖TryInvokeMember方法。

例如

  class MyCustomDynamicClass ：DynamicObject 
 {
 public override bool TryInvokeMember（InvokeMemberBinder binder，object [] args，out object result）
 {
 //我想知道这里的泛型参数的类型
} 
} 
  

在该方法里面我想知道类型如果有的话）调用中的通用参数。

eg
如果我调用以下代码，我想在我的动态对象的覆盖方法中获取System.Boolean和System.Int32的值

  dynamic myObject = new MyCustomDynamicClass（）; 
 myObject.SomeMethod< bool>（arg）; 
 myObject.SomeOtherMethod< int>（arg）; 
  

目前，如果我在重写方法中放置一个断点，我可以获取被调用的方法的名称SomeMethod和SomeOtherMethod，以及参数的值，而不是通用类型）。

如何获取这些值？

谢谢！

解决方案

实际上，我查看了binder的层次结构，找到了一个属性在对象的内部字段中具有所需的值。

问题是该属性不会因为使用C＃特定的代码/类而被公开，因此属性必须使用Reflection访问。

我在这个日本博客中找到了代码： http://neue.cc/category/programming （我不看日文，所以我不知道作者是否真的描述了这个相同的问题。

这是代码片段：

  var csharpBinder = binder.GetType（）。GetInterface（Microsoft.CSharp.RuntimeBinder.ICSharpInvokeOrInvokeMemberBinder）; 
 var typeArgs =（csharpBinder.GetProperty（TypeArguments）。GetValue（binder，null）as IList< Type>）; 
  

typeArgs是一个包含调用方法时使用的泛型参数类型的列表。

希望这有助于别人。

I'm starting to work with dynamic objects in .Net and I can't figure out how to do something.

I have a class that inherits from DynamicObject, and I override the TryInvokeMember method.

e.g.

class MyCustomDynamicClass : DynamicObject
{
    public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
    {
        // I want to know here the type of the generic argument
    }
}

And inside that method I want to know the type (if any) of the generic arguments in the invocation.

e.g. If I invoke the following code, I want to get the value of System.Boolean and System.Int32 inside the overrided method of my dynamic object

dynamic myObject = new MyCustomDynamicClass();
myObject.SomeMethod<bool>("arg");
myObject.SomeOtherMethod<int>("arg");

Currently if I place a breakpoint inside the overrided method I can get the name of the method being invoked ("SomeMethod" and "SomeOtherMethod", and also the values of the arguments, but not the generic types).

How can I get these values?

Thanks!

解决方案

Actually I looked through the hierarchy of the binder and found a property with the needed values in the internal fields of the object.

The problem is that the property isn't exposed because it uses C#-specific code/classes, therefore the properties must be accessed using Reflection.

I found the code in this japanese blog: http://neue.cc/category/programming (I don't read any japanese, therefore I'm not sure if the author actually describes this same issue

Here's the snippet:

var csharpBinder = binder.GetType().GetInterface("Microsoft.CSharp.RuntimeBinder.ICSharpInvokeOrInvokeMemberBinder");
var typeArgs = (csharpBinder.GetProperty("TypeArguments").GetValue(binder, null) as IList<Type>);

typeArgs is a list containing the types of the generic arguments used when invoking the method.

Hope this helps someone else.

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