一个自定义LABEL组件的C#源代码

using system;
using system.windows.forms;
using system.drawing;
using system.drawing.drawing2d;
using system.componentmodel;

namespace wzsbmain
{
 /// <summary>
 /// summary description for labelgradient.
 /// </summary>
  
 public class wzsbmainlabel : system.windows.forms.label
 {
  
  #region implementtation member fields
  protected color gradientcolorone = color.white;
  protected color gradientcolortwo = color.blue;
  protected lineargradientmode lgm = lineargradientmode.forwarddiagonal;
  protected border3dstyle b3dstyle = border3dstyle.bump;
  #endregion

  #region gradientcolorone properties
  [
  defaultvalue(typeof(color),"white"),
  description("the first gradient color."),
  category("appearance"),
  ]

   //gradientcolorone properties
  public color gradientcolorone
  {
   get
   {
    return gradientcolorone;
   }
   set
   {
    gradientcolorone = value;
    invalidate();
   }
  }
  #endregion
  
  #region gradientcolortwo properties
  [
  defaultvalue(typeof(color),"blue"),
  description("the second gradient color."),
  category("appearance"),
  ]

   //gradientcolortwo properties
  public color gradientcolortwo
  {
   get
   {
    return gradientcolortwo;
   }
   set
   {
    gradientcolortwo = value;
    invalidate();
   }
  }

  #endregion

  #region lineargradientmode properties
  //lineargradientmode properties
  [
  defaultvalue(typeof(lineargradientmode),"forwarddiagonal"),
  description("gradient mode"),
  category("appearance"),
  ]
  
  public lineargradientmode gradientmode
  {
   get
   {
    return lgm;
   }
   
   set
   {
    lgm = value;
    invalidate();
   }
  }
  #endregion
       
  #region border3dstyle properties
  //border3dstyle properties
  [
  defaultvalue(typeof(border3dstyle),"bump"),
  description("borderstyle"),
  category("appearance"),
  ]

   // hide borderstyle inherited from the base class
  new public border3dstyle borderstyle
  {
   get
   {
    return b3dstyle;
   }
   set
   {
    b3dstyle = value;
    invalidate();
   }
  }
  #endregion

  #region removed properties
  
  // remove backcolor property
  [
  browsable(false),
  editorbrowsable(editorbrowsablestate.never)
  ]
  public override system.drawing.color backcolor
  {
   get 
   {
    return new system.drawing.color();
   }
   set {;}
  }
  
  #endregion

  //  protected override void onpaint(system.windows.forms.painteventargs e)
  //  {
  //   graphics gfx = e.graphics;
  //   //border3dstyle b3dstyle = border3dstyle.bump;
  //   //border3dside b3dside = border3dside.all;
  //   
  //   rectangle rect = new rectangle (0,0,this.width,this.height);
  //
  //   // dispose of brush resources after use
  //   using (lineargradientbrush lgb = new lineargradientbrush(rect, gradientcolorone,gradientcolortwo,lgm))
  //   gfx.fillrectangle(lgb,rect);
  //   
  //   //3d border
  //   //controlpaint.drawborder3d(gfx,rect,b3dstyle,b3dside);
  //   
  //      
  //   // call the onpaint method of the base class
  //            base.onpaint(e);
  //   
  //  }

  protected override void onpaintbackground(system.windows.forms.painteventargs pevent)
  {
   graphics gfx = pevent.graphics;
   
   rectangle rect = new rectangle (0,0,this.width,this.height);
   
   // dispose of brush resources after use
   using (lineargradientbrush lgb = new lineargradientbrush(rect, gradientcolorone,gradientcolortwo,lgm))
    gfx.fillrectangle(lgb,rect);
   
   controlpaint.drawborder3d(gfx,rect,b3dstyle);
  }

 }
}