hi,

as i'm farely new to C#, i have some problem of creating a shallow copy
of a class inherited of CollectionBase.

As far as i see, i just need to copy the CollectionBase.List using the
CopyTo method.

Here i'm stuck:

public class myCollection : System.Collections.CollectionBase
{

protected myCollection()
{
}

protected int Add(object value)
{
if (value != null)
return List.Add(value);
else
return -1;
}

protected void Insert(int index, object value)
{
if (value != null)
List.Insert(index, value);
}

protected object this[int index]
{
get
{
return List[index];
}
set
{
Insert(index,value);
}
}

public void CopyTo(Array array, int start)
{
List.CopyTo(array, start);
}

}


Using

myCollection originalCollection = new myCollection;
myCollection shallowCopy = new myCollection;

originalCollection.CopyTo(shallowCopy, 0);

won't work.

I need some clues...


mfG
--> stefan <--

hi,

Stefan Hoffmann schrieb:
> public class myCollection : System.Collections.CollectionBase
> {
> protected myCollection()
> {
> }
> Using
>
> myCollection originalCollection = new myCollection;
> myCollection shallowCopy = new myCollection;
>
> originalCollection.CopyTo(shallowCopy, 0);
>
> won't work.
This is the real inheritence chain:

class NullSafeCollection: System.Collections.CollectionBase {}
class StraightSegmentList: NullSafeCollection {}

Using

StraightSegmentList originalSegments;

StraightSegmentList copy = new StraightSegmentList();
originalSegments.CopyTo(copy, 0);

doesn't compile.


mfG
--> stefan <--

Hi Stefan,
try using the Clone() method, this creates a shallow copy of the collection
Mike Powell
www.ramuseco.com

"Stefan Hoffmann" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> hi,
>
> Stefan Hoffmann schrieb:
>> public class myCollection : System.Collections.CollectionBase
>> {
>> protected myCollection()
>> {
>> }
>> Using
>>
>> myCollection originalCollection = new myCollection;
>> myCollection shallowCopy = new myCollection;
>>
>> originalCollection.CopyTo(shallowCopy, 0);
>>
>> won't work.
> This is the real inheritence chain:
>
> class NullSafeCollection: System.Collections.CollectionBase {}
> class StraightSegmentList: NullSafeCollection {}
>
> Using
>
> StraightSegmentList originalSegments;
>
> StraightSegmentList copy = new StraightSegmentList();
> originalSegments.CopyTo(copy, 0);
>
> doesn't compile.
>
>
> mfG
> --> stefan <--
>