C# how to get a bitmap from a picturebox

问题

I have a image in picturebox. I want to get that image as a Bitmap.

My one line code is:

Bitmap default_image = (Bitmap)pictureBox5.Image.Clone();

But what i am getting is:

default_image value=null;

Can anyone help me.

回答1:

Bitmap default_image = new Bitmap(pictureBox5.Image);

You are never instantiating a Bitmap which is why it is null.

回答2:

If you got the image into the PictureBox by using imageLocation

pbSourceImage.ImageLocation = openFile.FileName;

then PictureBox.Image will be null.

Instead, load the picture using

pbSourceImage.Image = Image.FromFile(openFile.FileName);

Then you will be able to clone from the Image property.

回答3:

This is because you do not have image, probably you have BackgroundImage. You need to have Image properties fill with your picture.

来源：https://stackoverflow.com/questions/6996987/c-sharp-how-to-get-a-bitmap-from-a-picturebox