- Posted by Shay Friedman on October 5, 2009
A while ago I wrote a post about using Generic CLR classes from IronRuby. This time I’ll share with you its less intuitive friend – using generic CLR methods from IronRuby.
As a result of Ruby being a duck-typed language which works with types implicitly, generics is not really needed. The whole language is generic… This is why using generic CLR types might become a bit odd for the language. Nonetheless, this fact will not stop us. The price to pay in order to enjoy Ruby in the .Net framework is worth it! :)
Anyway, assuming we have the following C# class defined in file sample.dll:
namespace ClassLibrary1
{
public class Class1
{
public string Test<T>(T param)
{
return param.ToString();
}
}
}In order to use it with a specific type, you need to do two things – get the generic method object (by using the method method) and provide it with the type via the special of method. For example, the next code invokes Test with a string and pass it “Shay Friedman”:
require "sample.dll"
sample = ClassLibrary1::Class1.new
sample.method(:test).of(String).call("Shay Friedman") # returns "Shay Friedman"
And that’s all there is to know.
All the best,
Shay.
- Posted by Shay Friedman on March 28, 2009
In the latest version of IronRuby (0.3), the ability to use Generic .Net classes was added. I couldn’t find anywhere how to do that so I dug it out of the code and now I’ll share it with you!
Example #1 - List
This is how to define an Int32 list, add two numbers to it and print them:
|
list = System::Collections::Generic::List[System::Int32].new
list.add 4
list.add 12
list.each { |x| puts x }
|
Of course we can also use Ruby type like Numeric, String, etc.
Example #2 – Dictionary
This is how to declare a number-string dictionary, add values to it and print them:
|
dict = System::Collections::Generic::Dictionary[Fixnum, String].new
dict.add 1, "Hey"
dict.add 15, "There"
dict.each { |x| puts "#{x.key} - #{x.value}" }
|
All the best,
Shay.