Finally, I inherited it from system. Windows. Forms. Control.

A good web page, good, chat record, write down.

The essay published the day before, which records some resources. Due to the real access to. Net (WIN form ?) It's still relatively late, so it's still stupid till now, or it's just a second flight.

After carefully reading some resources, we finally made the first control to celebrate.

Using System;
Using System. Windows. forms;
Using System. componentmodel;
Using System. drawing;
Using System. Drawing. drawing2d;
Using System. Drawing. design;

Namespace Dividerpanel
{
/**/ /// <Summary>
///My first control.
/// </Summary>
[Toolboxitem ( True )]
[Toolboxbitmap ( Typeof (Myfirstcontrol)]
Public   Class Myfirstcontrol: system. Windows. Forms. Control
{

Private System. Drawing. drawing2d. graphicspath =   New Graphicspath (system. Drawing. drawing2d. fillmode. Alternate );

Private Color backcolor = Color. Black;

Public Myfirstcontrol ()
{
This . Graphicspath. addpolygon ( New Point [] {
New Point ( 10 , 0 ),
New Point ( 10 , 10 ),
New Point ( 0 , 10 ),
New Point ( 0 , 90 ),
New Point ( 10 , 90 ),
New Point ( 10 , 100 ),
New Point ( 190 , 100 ),
New Point ( 190 , 90 ),
New Point ( 200 , 90 ),
New Point ( 200 , 10 ),
New Point ( 190 , 10 ),
New Point ( 190 , 0 )
} );

This . Region =   New Region (graphicspath );
}

Private   Void Initializecomponent ()
{
}

Protected   Override   Void Onpaint (painteventargs E)
{
Lineargradientbrush B =   New Lineargradientbrush ( This . Clientrectangle,
This . Backcolor, This . Backcolor, 0 , False );

E. Graphics. fillrectangle (B, This . Clientrectangle );
}

Protected   Override   Void Ongotfocus (eventargs E)
{
Base. Ongotfocus (E );
This. Backcolor=Color. Red;
This. Invalidate ();
}

Protected   Override   Void Onlostfocus (eventargs E)
{
Base. Onlostfocus (E );
This. Backcolor=Color. Black;
This. Invalidate ();
}

Protected   Override   Void Onclick (eventargs E)
{
Base. Onclick (E );

This. Focus ();
}

}
}