How to delete an image file which is loaded on a datagridview C#?

Question

I have a datagridview with an image column on my form and I set its value to an image in some folder..

Bitmap PicImage;

PicImage = new Bitmap(ImagePath);
Grid.Rows[i].Cells["ImageColumn"].Value = PicImage;

when I want to delete the row,the image should be deleted too, but I get "the process cannot access the file..." message:

File.delete(ImagePath);

How can I solve it?

Answer 1

Use a file stream to unlock the file , so instead of:

PicImage = new Bitmap(ImagePath);

use:

using (var stream= new System.IO.FileStream(ImagePath, System.IO.FileMode.Open))
{
    var bmp= new Bitmap(stream);
    PicImage  = (Bitmap) bmp.Clone();
}

Answer 2

首先尝试从位图上卸载图像，然后将其删除。

Answer 3

The cleanest method is to load it without any links to files or streams. If it's just for showing on a UI, the simplest way to do this without deep-cloning using LockBits is simply to paint it on a new 32BPP ARGB image:

Bitmap image;
using (Bitmap tmpImage = new Bitmap(filepath))
{
    image = new Bitmap(tmpImage.Width, tmpImage.Height, PixelFormat.Format32bppArgb);
    using (Graphics gr = Graphics.FromImage(image))
        gr.DrawImage(tmpImage, new Rectangle(0, 0, image.Width, image.Height));
}
// Bitmap "image" is now ready to use.

Answer 4

The following code unlinked the datagridview from the image file.

Bitmap timage;
                using (Bitmap tmpImage = new Bitmap(tname))
                {
                    timage = new Bitmap(tmpImage.Width, tmpImage.Height, PixelFormat.Format32bppArgb);
                    using (Graphics gr = Graphics.FromImage(timage))
                        gr.DrawImage(tmpImage, new Rectangle(0, 0, timage.Width, timage.Height));
                }
                fileGridView.Rows[dgIndex].Cells["thumbNail"].Value = timage;