如何在IronRuby中实现包含CLR事件的界面 [英] How do I Implement an interface in IronRuby that includes CLR Events
问题描述
我正在尝试IronRuby和WPF,我想自己写一个命令。我有以下的东西,据我所知。
I'm experimenting with IronRuby and WPF and I'd like to write my own commands. What I have below Is as far as I can figure out.
class MyCommand
include System::Windows::Input::ICommand
def can_execute()
true
end
def execute()
puts "I'm being commanded"
end
end
但是ICommand接口定义了CanExecuteChanged事件。如何在IronRuby中实现?
But the ICommand interface defines the CanExecuteChanged event. How do I implement that in IronRuby?
编辑:感谢Kevin的回应
这是基于DLR的27223更改集的工作原理。传递给can_execute和执行的值为nil。
Here's what works based on the 27223 change set of the DLR. The value passed in to can_execute and execute are nil.
class MyCommand
include System::Windows::Input::ICommand
def add_CanExecuteChagned(h)
@change_handlers << h
end
def remove_CanExecuteChanged(h)
@change_handlers.remove(h)
end
def can_execute(arg)
@can_execute
end
def execute(arg)
puts "I'm being commanded!"
@can_execute = false
@change_handlers.each { |h| h.Invoke(self, System::EventArgs.new) }
end
def initialize
@change_handlers = []
@can_execute = true
end
end
推荐答案
看起来这是由Tomas <稍后有一个href =http://ironruby.codeplex.com/WorkItem/View.aspx?WorkItemId=1852 =nofollow noreferrer>
It looks like this was implemented by Tomas somewhat recently:
所以您可能需要从 github 的最新来源编译
So you may need to compile from the latest source at github
看起来您需要为要传入和存储的处理程序添加一个地方。也就是说,通过为特定的事件处理程序添加一些add_和remove_例程。
这样的东西可能会根据你的需要工作(天真的,所以请测试和完成):
It looks like you need to add a place for the handler to be passed in and stored. Namely, by adding some add_ and remove_ routines for the specific event handler in question. Something like this might work based on your needs (naive, so please test and flesh out):
class MyCommand
include System::Windows::Input::ICommand
def add_CanExecuteChanged(h)
@change_handler = h
end
def remove_CanExecuteChanged
@change_handler = nil
end
def can_execute()
true
end
def execute()
#puts "I'm being commanded"
@change_handler.Invoke if @change_handler
end
end
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