C# PictureBox on top of another PictureBox

问题

I want the pbGrade to be on top of pbItemtype (pb = picture box)

 pbItemtype.BackColor = Color.Transparent;

 // Change parent for overlay PictureBox...
 pbItemtype.Parent = pbGrade;

I already tried this but then the pbItemtype is not even appearing, also the 2 picture boxes change images (pbItemtype and pbGrade)

回答1:

Well actually you can do that easily and in fact you already did.

The code works but you also need to correct the Location as the nested PB will keep it previous one and thus will probably be off to the bottom right, probably leaving the visible size of the new Parent.... :

pbItemtype.BackColor = Color.Transparent;

// Change parent for overlay PictureBox...
pbItemtype.Parent = pbGrade;
// Move it to the top left of the parent:
pbItemtype.Location = Point.Empty;  // or some other position..

Transparency works well when nesting controls. It doesn't work when overlapping them, though !

(Of course the code we see will not exchange the images!)

回答2:

Best approach is to construct the image with overlays off-line in a Bitmap object, then assign that constructed image to the PictureBox for display.

For example like this:

int width = 100;
int height = 100;
Image image = new Bitmap(width, height);

using (var graphics = Graphics.FromImage(image))
{
    graphics.DrawImage(MyApplication.Properties.Resources.ImageItemX, new Rectangle(0, 0, width, height));
    graphics.DrawImage(MyApplication.Properties.Resources.ImageGradeZ, new Rectangle(0, 0, width, height));
}

myPictureBox.SizeMode = PictureBoxSizeMode.Zoom;
myPictureBox.Image = image;

This assumes that ImageItemX and ImageGradeZ are images with a transparent background (for example pngs) imported as project resources under these names.

For example given these resources

the code will produce this:

来源：https://stackoverflow.com/questions/42047651/c-sharp-picturebox-on-top-of-another-picturebox

标签

winforms

picturebox