using using

[Martijn Mulder]

When I want to invoke Dispose() automatically on an object, I can use

using(object)
{
//do something with object
}

and after the closing brace the object is Disposed(). But what get
disposed when I use code like this

override protected void OnPaint(PaintEventArgs e)
{
using(e.Graphics.Clip=GetMyCustomRegion())
{
e.Graphics.DrawImage(bitmap,0,0);
}
}

Is the Region object returned by GetMyCustomRegion() succesfully
Disposed()? How does it influence the Clip-property of the Graphics object?

Also, can I nest 'using' statement like this:

override protected void OnPaint(PaintEventArgs e)
{
using(e.Graphics.Clip=GetMyCustomRegion())
using(Bitmap bitmap=new Bitmap(34,55))
{
e.Graphics.DrawImage(bitmap,0,0);
}
}

Do both the implicit Region object and the Bitmap object get Disposed()?

[Alex Meleta]

Hi Martijn,

MMusing(e.Graphics.Clip=GetMyCustomRegion())
MMIs the Region object returned by GetMyCustomRegion() succesfully Disposed()?

Yes, why not, reference is the same, it's kind of
using (Region tempRegion = (e.Graphics.Clip = <new Region()>))
{
e.Graphics.DrawImage(null, 0, 0);
}

MMusing(e.Graphics.Clip=GetMyCustomRegion())
MMusing(Bitmap bitmap=new Bitmap(34,55))
First for the bitmap, then for the region.

http://msdn2.microsoft.com/en-us/lib...02(VS.80).aspx

Regards, Alex
[TechBlog] http://devkids.blogspot.com

MMWhen I want to invoke Dispose() automatically on an object, I can
MMuse
MM>
MMusing(object)
MM{
MM//do something with object
MM}
MMand after the closing brace the object is Disposed(). But what get
MMdisposed when I use code like this
MM>
MMoverride protected void OnPaint(PaintEventArgs e)
MM{
MMusing(e.Graphics.Clip=GetMyCustomRegion())
MM{
MMe.Graphics.DrawImage(bitmap,0,0);
MM}
MM}
MMIs the Region object returned by GetMyCustomRegion() succesfully
MMDisposed()? How does it influence the Clip-property of the Graphics
MMobject?
MM>
MMAlso, can I nest 'using' statement like this:
MM>
MMoverride protected void OnPaint(PaintEventArgs e)
MM{
MMusing(e.Graphics.Clip=GetMyCustomRegion())
MMusing(Bitmap bitmap=new Bitmap(34,55))
MM{
MMe.Graphics.DrawImage(bitmap,0,0);
MM}
MM}
MMDo both the implicit Region object and the Bitmap object get
MMDisposed()?
MM>