Cut an Image into 9 pieces C# [duplicate]

Answer 1

First off, instead of using img1, img2... use an array with a size of 9. Then it's much easier to do this using a couple of loops like this:

var imgarray = new Image[9];
var img = Image.FromFile("media\\a.png");
for( int i = 0; i < 3; i++){
  for( int j = 0; j < 3; j++){
    var index = i*3+j;
    imgarray[index] = new Bitmap(104,104);
    var graphics = Graphics.FromImage(imgarray[index]);
    graphics.DrawImage( img, new Rectangle(0,0,104,104), new Rectangle(i*104, j*104,104,104), GraphicsUnit.Pixel);
    graphics.Dispose();
  }
}

Then you can fill your boxes like this:

pictureBox1.Image = imgarray[0];
pictureBox2.Image = imgarray[1];
...

Answer 2

You could try with this code. It basically creates a matrix of images (like you need in your project) and draws on each Bitmap adequate part of the large image. The same concept you could use for the pictureBoxes and put them in the matrix.

Image img = Image.FromFile("media\\a.png"); // a.png has 312X312 width and height
int widthThird = (int)((double)img.Width / 3.0 + 0.5);
int heightThird = (int)((double)img.Height / 3.0 + 0.5);
Bitmap[,] bmps = new Bitmap[3,3];
for (int i = 0; i < 3; i++)
    for (int j = 0; j < 3; j++)
    {
        bmps[i, j] = new Bitmap(widthThird, heightThird);
        Graphics g = Graphics.FromImage(bmps[i, j]);
        g.DrawImage(img, new Rectangle(0, 0, widthThird, heightThird), new Rectangle(j * widthThird, i * heightThird, widthThird, heightThird), GraphicsUnit.Pixel);
        g.Dispose();
    }
pictureBox1.Image = bmps[0, 0];
pictureBox2.Image = bmps[0, 1];
pictureBox3.Image = bmps[0, 2];
pictureBox4.Image = bmps[1, 0];
pictureBox5.Image = bmps[1, 1];
pictureBox6.Image = bmps[1, 2];
pictureBox7.Image = bmps[2, 0];
pictureBox8.Image = bmps[2, 1];
pictureBox9.Image = bmps[2, 2];