C# 中的 typeof 保留字是否有 Ruby 等价物？
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Is there a Ruby equivalent for the typeof reserved word in C#?
提问by Chris
I have a C# method that I need to call from a piece of Ruby that requires a System.Type argument. Is there a Ruby equivalent to typeof in C#? The call will look something like this in C# ...
我有一个 C# 方法，我需要从一块需要 System.Type 参数的 Ruby 中调用它。在 C# 中是否有与 typeof 等效的 Ruby？调用在 C# 中看起来像这样......
var CustomClasInstance = Container.GetInstance(typeof(ICustomClass))
var CustomClasInstance = Container.GetInstance(typeof(ICustomClass))
采纳答案by RyanWilcox
In addition to checking Object#class (the instance method class on the Object aka Base class), you could
除了检查 Object#class（Object aka Base 类上的实例方法类），您还可以
s.is_a? Thing
this will check to see if s has Thing anywhere in its ancestry.
这将检查 s 是否在其祖先的任何地方都有 Thing 。
回答by jsalonen
For a reference on how to identify variable types in Ruby, see http://www.techotopia.com/index.php/Understanding_Ruby_Variables#Identifying_a_Ruby_Variable_Type
有关如何在 Ruby 中识别变量类型的参考，请参阅 http://www.techotopia.com/index.php/Understanding_Ruby_Variables#Identifying_a_Ruby_Variable_Type
If you have variable named s, you can retrieve the type of it by invoking
如果您有变量 named s，则可以通过调用来检索它的类型
s.class
s.class
回答by dtb
ICustomClass.to_clr_type
回答by bta
Either Object.classor Object.typeshould do what you need.
要么Object.class或Object.type应该做你需要的。
Also, the two methods Object.is_a?and Object.instance_of?can be used. However, they are not 100% identical. The statement obj.instance_of?(myClass)will return true only if object objwas created as an object of type myClass. Using obj.is_a?(myClass)will return true if the object objis of class myClass, is of a class that has inherited from myClass, or has the module myClassincluded in it.
此外，这两种方法Object.is_a?，并Object.instance_of?可以使用。但是，它们并非 100% 相同。obj.instance_of?(myClass)仅当 objectobj被创建为 type 的对象时，该语句才会返回 true myClass。obj.is_a?(myClass)如果对象obj属于 class myClass，属于从 继承的类myClass，或者包含模块，则Using将返回 true myClass。
For example:
例如：
x = 1
x.class => Fixnum
x.instance_of? Integer => false
x.instance_of? Numeric => false
x.instance_of? Fixnum => true
x.is_a? Integer => true
x.is_a? Numeric => true
x.is_a? Fixnum => true
Since your C# method requires a very specific data type, I would recommend using Object.instance_of?.
由于您的 C# 方法需要非常特定的数据类型，因此我建议使用Object.instance_of?.
