how to programmatically change the background imag

问题:

I need to change the background image of my form when i klick a button, and change it back to null again the second time it is clicked, how can i do this?

回答1:

Use BackgroundImage property:

form.BackgroundImage = image;

to hide the image:

form.BackgroundImage = null;

Put this source code to ClickButton method:

form.BackgroundImage = form.BackgroundImage == null ? image : null;

回答2:

You should be able to set the BackgroundImage property of your form from the event handler of that button.

For example you could do it like this:

this.BackgroundImage = new Bitmap(@"c:\Temp\image.bmp");

In order to remove the image, set the property back to null.

The image can also come from a resource.