CollectionBase derived class not saving design time items

[niyad]

hi
On a form ive added my custom component (MyComponent) which has a property
(IDs in the expample code) exposing a collection of int16. I see this
property in the PropertyGrid and I dont have trouble adding items to the
collection at design time (using standard CollectionEditor class). I can
Add, remove items at design time, however all the items are lost after a
compilation.

public class MyComponent : Component{
Int16Collection int_col;

public Int16Collection IDs{
get{
return int_col;
}
set{
int_col = value;
}
}
}

Here's my custom collection class.

public class Int16Collection : CollectionBase {
public Int16 this[ int index ]{
get{
return( (Int16) List[index] );
}
set{
List[index] = value;
}
}
.....
....

I dont understand how/why all the items added at design time disappear on
compilation of the form. Where are the items saved between design time and
compilation time?

any help much appreciated

[Claes Bergefall]

Add the following to your IDs property
[DesignerSerializationVisibility(DesignerSerializat ionVisibility.Content)]

/claes
"niyad" <ms*@iris.co.uk> wrote in message
news:c0**********@sparta.btinternet.com...

hi
On a form ive added my custom component (MyComponent) which has a property
(IDs in the expample code) exposing a collection of int16. I see this
property in the PropertyGrid and I dont have trouble adding items to the
collection at design time (using standard CollectionEditor class). I can
Add, remove items at design time, however all the items are lost after a
compilation.

public class MyComponent : Component{
Int16Collection int_col;

public Int16Collection IDs{
get{
return int_col;
}
set{
int_col = value;
}
}
}

Here's my custom collection class.

public class Int16Collection : CollectionBase {
public Int16 this[ int index ]{
get{
return( (Int16) List[index] );
}
set{
List[index] = value;
}
}
....
...

I dont understand how/why all the items added at design time disappear on
compilation of the form. Where are the items saved between design time and
compilation time?

any help much appreciated

[niyad]

Still the same. I had tried that before.

"Claes Bergefall" <cl********************@frontec.se> wrote in message
news:ek**************@TK2MSFTNGP10.phx.gbl...

Add the following to your IDs property
[DesignerSerializationVisibility(DesignerSerializat ionVisibility.Content)]

/claes
"niyad" <ms*@iris.co.uk> wrote in message
news:c0**********@sparta.btinternet.com...

hi
On a form ive added my custom component (MyComponent) which has a property (IDs in the expample code) exposing a collection of int16. I see this
property in the PropertyGrid and I dont have trouble adding items to the
collection at design time (using standard CollectionEditor class). I can
Add, remove items at design time, however all the items are lost after a
compilation.

public class MyComponent : Component{
Int16Collection int_col;

public Int16Collection IDs{
get{
return int_col;
}
set{
int_col = value;
}
}
}

Here's my custom collection class.

public class Int16Collection : CollectionBase {
public Int16 this[ int index ]{
get{
return( (Int16) List[index] );
}
set{
List[index] = value;
}
}
....
...

I dont understand how/why all the items added at design time disappear on compilation of the form. Where are the items saved between design time and compilation time?

any help much appreciated

[Claes Bergefall]

Hmm, that should work
I noticed that IDs property is Read/Write, Perhaps that's
the reason the attribute doesn't work in your case.

/claes
"niyad" <ms*@iris.co.uk> wrote in message
news:c0**********@titan.btinternet.com...

Still the same. I had tried that before.

"Claes Bergefall" <cl********************@frontec.se> wrote in message
news:ek**************@TK2MSFTNGP10.phx.gbl...

Add the following to your IDs property
[DesignerSerializationVisibility(DesignerSerializat ionVisibility.Content)]

/claes
"niyad" <ms*@iris.co.uk> wrote in message
news:c0**********@sparta.btinternet.com...

hi
On a form ive added my custom component (MyComponent) which has a

property (IDs in the expample code) exposing a collection of int16. I see this
property in the PropertyGrid and I dont have trouble adding items to the collection at design time (using standard CollectionEditor class). I can Add, remove items at design time, however all the items are lost after a compilation.

public class MyComponent : Component{
Int16Collection int_col;

public Int16Collection IDs{
get{
return int_col;
}
set{
int_col = value;
}
}
}

Here's my custom collection class.

public class Int16Collection : CollectionBase {
public Int16 this[ int index ]{
get{
return( (Int16) List[index] );
}
set{
List[index] = value;
}
}
....
...

I dont understand how/why all the items added at design time disappear on compilation of the form. Where are the items saved between design time and compilation time?

any help much appreciated