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Array.IList implementation

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A J Le Couteur Bisson

I am very confused with the Array.IList implementation. All of the methods
are private which hardly seems to be fulfilling the IList contract... If I
cast an array then IList methods (e.g. Contains()) work correctly for arrays
of rank 1. Where is the code that check the rank of arrays and
allows/disallows IList.Contains() accordingly? I am using Reflector to
examine the framework code and I cannot find this functionality. Any clues?

Thanks,
Andy

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Dot Net Guruias Sjögren

[Original message clipped]

Why not? Interfaces don't specify which accessibility the implementing
method must have - private is fine.

[Original message clipped]

Array::System.Collections.IList.Contains(object) calls
Array::IndexOf(Array, object), which in turn calls
Array::IndexOf(Array, object, int, int). There you'll find code that
checks the Rank and throws an exception if it's != 1.

Dot Net Guruias

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Dot Net Guruias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

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A J Le Couteur Bisson

"Dot Net Guruias Sjögren" <Click here to reveal e-mail address> wrote in message
news:#Click here to reveal e-mail address...
[Original message clipped]

Thanks for the prompt response. Clearly the contract offered by interfaces
*can* be rather less useful than I supposed. (I am reminded of a past
employer
which, under contract to make 'a delivery', delivered an empty box!**)

I am still puzzled as to why these methods are private. What harm could
result
from making them public?

if((myArray as IList).Contains(3))

doesn't seem any clearer or more appropriate than

if(myArray.Contains(3))

Thanks,
Andy

** A very large company that ought to know better...

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Dot Net Guruias Sjögren

Andy,

[Original message clipped]

I don't know why they decided to implement IList privately. Perhaps
because the interface is only partially supported (the Add, Insert,
Remove and RemoveAt methods will throw).

Dot Net Guruias

--
Dot Net Guruias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

Reply to this message...

	System.Array
	System.Collections.IList

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