System.Array inherits from IList ???

[Chris]

Hi,

the specs for System.Array are :
MustInherit Public Class Array
Implements ICloneable, IList, ICollection, IEnumerable

but I can't use any of the functions presented by IList in my code
Dim numbers As System.Array
numbers.Add(1) --> NOT POSSIBLE Compiler error : 'System.Array'
does not contain a definition for 'Add'

nor some belonging to ICollection : SyncRoot:yes, Count:no
numbers.Count --> NOT POSSIBLE

IEnumerable : no problem

What is reasoning behind all this ?
Already does intelisense not show those functions. But why not ? if the
specs make you suppose you could use them.

Thanks in advance

Chris

[Herfried K. Wagner [MVP]]

* "Chris" <ch********@pandora.be> scripsit:

the specs for System.Array are :
MustInherit Public Class Array
Implements ICloneable, IList, ICollection, IEnumerable

but I can't use any of the functions presented by IList in my code
Dim numbers As System.Array
numbers.Add(1) --> NOT POSSIBLE Compiler error : 'System.Array'
does not contain a definition for 'Add'

nor some belonging to ICollection : SyncRoot:yes, Count:no
numbers.Count --> NOT POSSIBLE

IEnumerable : no problem

What is reasoning behind all this ?
Already does intelisense not show those functions. But why not ? if the
specs make you suppose you could use them.

The interfaces are explicitly implemented (a feature, VB.NET doesn't
provide).

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[Mark Hurd]

Herfried K. Wagner [MVP] wrote:

* "Chris" <ch********@pandora.be> scripsit:

the specs for System.Array are :
MustInherit Public Class Array
Implements ICloneable, IList, ICollection,
IEnumerable

but I can't use any of the functions presented by IList in my code
Dim numbers As System.Array
numbers.Add(1) --> NOT POSSIBLE Compiler error :
'System.Array' does not contain a definition for 'Add'

nor some belonging to ICollection : SyncRoot:yes, Count:no
numbers.Count --> NOT POSSIBLE

IEnumerable : no problem

What is reasoning behind all this ?
Already does intelisense not show those functions. But why not ? if
the specs make you suppose you could use them.
The interfaces are explicitly implemented (a feature, VB.NET doesn't
provide).

No, they just haven't made the methods public on the class, (the default
interface in VB6/COM speak) or not with the same name.

Eg. Array.Length Implements ICollection.Count

(Proof:
With GetType(System.Array)
System.Console.WriteLine( _
.GetMethod("Length") _
Is .GetMethod("Count", New System.Type() _
{GetType(System.Collections.ICollection)}))
End With

displays True.(*))

BTW IList.Add on an Array always fails with System.NotSupportedException,
message: Collection was of a fixed size.
--
Regards,
Mark Hurd, B.Sc.(Ma.) (Hons.)
(*) That looks convoluted enough to just use ILDASM and determine it from
there, but it's acually my (tested) conversion from this DotLisp test: (eql? (.GetMethod Array. "Length")(.GetMethod Array. "Count"

[ICollection.]))
True