[IronPython] Calling explicitly-implemented interface methods

[Michael Foord]

On 30/04/2010 23:32, Dino Viehland wrote:
> Michael wrote:
>    
>> Hey all,
>>
>> I'm porting the dotnet-integration document that comes with IronPython
>> to Try Python. The following example doesn't work, because RegistryKey
>> isn't available on Silverlight. Can anyone suggest a good alternative of
>> an explicitly implemented interface method on a class in Silverlight?
>>      
> One example might be Python file objects which also implement IDisposable.
>
>    

That would be a really inconvenient example to pick, since in Try Python 
I patch __builtin__.file to be a custom type that reads / writes files 
to local storage. :-)

Can you think of anything else?

Michael

>> \.NET allows a method with a different name to override a base method
>> implementation or interface method slot. This is useful if a type implements
>> two interfaces with methods with the same name. This is known as
>> `explicity implemented interface methods
>> <http://msdn.microsoft.com/en-us/library/4taxa8t2.aspx>`_.
>> For example, `Microsoft.Win32.RegistryKey`
>> implements `System.IDisposable.Dispose` explicitly::
>>
>>   >>>  from Microsoft.Win32 import RegistryKey
>>   >>>  clr.GetClrType(RegistryKey).GetMethod("Flush") #doctest: +ELLIPSIS
>> <System.Reflection.RuntimeMethodInfo object at ... [Void Flush()]>
>>   >>>  clr.GetClrType(RegistryKey).GetMethod("Dispose")
>>   >>>
>>
>> In such cases, IronPython tries to expose the method using its simple name -
>> if there is no ambiguity::
>>
>>   >>>  from Microsoft.Win32 import Registry
>>   >>>  rkey = Registry.CurrentUser.OpenSubKey("Software")
>>   >>>  rkey.Dispose()
>>
>> However, it is possible that the type has another method with the same name.
>> In that case, the explicitly implemented method is not accessible as an
>> attribute.
>> However, it can still be called by using the unbound class instance
>> method syntax::
>>
>>   >>>  rkey = Registry.CurrentUser.OpenSubKey("Software")
>>   >>>  System.IDisposable.Dispose(rkey)
>>
>>
>> All the best,
>>
>> Michael Foord
>>
>> --
>> http://www.ironpythoninaction.com/
>> http://www.voidspace.org.uk/blog
>>
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READ CAREFULLY. By accepting and reading this email you agree, on behalf of your employer, to release me from all obligations and waivers arising from any and all NON-NEGOTIATED agreements, licenses, terms-of-service, shrinkwrap, clickwrap, browsewrap, confidentiality, non-disclosure, non-compete and acceptable use policies (”BOGUS AGREEMENTS”) that I have entered into with your employer, its partners, licensors, agents and assigns, in perpetuity, without prejudice to my ongoing rights and privileges. You further represent that you have the authority to release me from any BOGUS AGREEMENTS on behalf of your employer.