The first window class of the write WPF

/*
* User: Administrator
* Date: Time:
  */

UsingSystem;
UsingSystem. windows;
UsingSystem. Windows. input;

Namespace Wpftest
{
///   <Summary>
/// Description of cxywin.
///   </Summary>
Public   Class Cxywin: Window
{
Public Cxywin ()
{
Title = " Grow and shrink Test " ;
Windowstartuplocation = Windowstartuplocation. centerscreen;
Height = 400 ;
Width = 400 ;
This . Windowstyle = Windowstyle. threedborderwindow; // Display control buttons
// This. resizemode = resizemode. noresize; // Disable resize
This . Windowstate = Windowstate. maximized; // Window status
}

Protected   Override   Void Ontextinput (textcompositioneventargs E)
{
// The entered string is displayed on the title bar.
Base . Ontextinput (E );
If (E. Text = " \ B "   && Title. Length > 0 ) // Delete characters when character rollback
{
Title = Title. substring ( 0 , Title. Length - 1 );

}
Else   If ( ! Char . Iscontrol (E. Text [ 0 ])
{
Title = Title + E. Text;
}
}

Protected   Override   Void Onkeydown (keyeventargs E)
{
Base . Onkeydown (E );
// Adjust the position of the window to add moreCodeResize the form

If (E. Key = Key. UP)
{
Left -= Width * 0.05 ;
Top -= Height * 0.05 ;

}
If (E. Key = Key. down)
{
Left + = Width * 0.05 ;
Top + = Height * 0.05 ;
}

}

}
}