Inteface for Controls.Add(???)

[Matthias Langbein]

Hi all,
how do I solve this problem:

Interface A
{...}

Class B : System.Windows.Forms.UserControl, A
{...}

ClassC : System.Windows.Forms.UserControl, A
{...}

Class D : System.Windows.Forms.UserControl
{
A val1 = new B();
A val2 = new C();
.....
this.add(val1);
this.add(val2);
}
Compilation Error because val1/val2 cannot be converted to
UserControl. As far as I know a Interface cannot inherit from a class,
but only extend another inteface. So which Interface can I use so
"this.add(val1)" works??

Thanks a lot,
Langi

[Mythran]

"Matthias Langbein" <ma***************@web.dewrote in message
news:p8********************************@4ax.com...

Hi all,
how do I solve this problem:

Interface A
{...}

Class B : System.Windows.Forms.UserControl, A
{...}

ClassC : System.Windows.Forms.UserControl, A
{...}

Class D : System.Windows.Forms.UserControl
{
A val1 = new B();
A val2 = new C();
....
this.add(val1);
this.add(val2);
}
Compilation Error because val1/val2 cannot be converted to
UserControl. As far as I know a Interface cannot inherit from a class,
but only extend another inteface. So which Interface can I use so
"this.add(val1)" works??

Thanks a lot,
Langi

try:

this.add((System.Windows.Forms.UserControl) val1);
this.add((System.Windows.Forms.UserControl) val2);

hth,
Mythran