/// <include file='doc\IDeviceContext.uex' path='docs/doc[@for="DeviceContext.Dispose1"]/*' />
internal void Dispose(bool disposing)
{
if (disposed)
{
return;
}
if (this.Disposing != null)
{
this.Disposing(this, EventArgs.Empty);
}
this.disposed = true;
#if !DRAWING_NAMESPACE
DisposeFont(disposing);
#endif
switch (this.dcType)
{
case DeviceContextType.Display:
Debug.Assert(disposing, "WARNING: Finalizing a Display DeviceContext.\r\nReleaseDC may fail when not called from the same thread GetDC was called from.");
((IDeviceContext)this).ReleaseHdc();
break;
case DeviceContextType.Information:
case DeviceContextType.NamedDevice:
// CreateDC and CreateIC add an HDC handle to the HandleCollector; to remove it properly we need
// to call DeleteHDC.
#if TRACK_HDC
Debug.WriteLine(DbgUtil.StackTraceToStr(String.Format("DC.DeleteHDC(hdc=0x{0:x8})", unchecked ((int)this.hDC))));
#endif
IntUnsafeNativeMethods.DeleteHDC(new HandleRef(this, this.hDC));
this.hDC = IntPtr.Zero;
break;
case DeviceContextType.Memory:
// CreatCompatibleDC adds a GDI handle to HandleCollector, to remove it properly we need to call
// DeleteDC.
#if TRACK_HDC
Debug.WriteLine(DbgUtil.StackTraceToStr(String.Format("DC.DeleteDC(hdc=0x{0:x8})", unchecked ((int)this.hDC))));
#endif
IntUnsafeNativeMethods.DeleteDC(new HandleRef(this, this.hDC));
this.hDC = IntPtr.Zero;
break;
// case DeviceContextType.Metafile: - not yet supported.
#if WINFORMS_PUBLIC_GRAPHICS_LIBRARY
case DeviceContextType.Metafile:
IntUnsafeNativeMethods.CloseEnhMetaFile(new HandleRef(this, this.Hdc));
this.hDC = IntPtr.Zero;
break;
#endif
case DeviceContextType.Unknown:
default:
return;
// do nothing, the hdc is not owned by this object.
// in this case it is ok if disposed throught finalization.
}
DbgUtil.AssertFinalization(this, disposing);
}