Picturebox sometimes doesnt show image

Question

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i have create simple manga reader with multiple PictureBox to contain image each page. The PictureBox then added to flowlayoutpanel top to bottom.
The Problem is there's some image that doesnt show and when i resize the form the image showed.
Screenshoot to help

imglayout = FlowLayoutPanel

What I have tried:

C#

chapterList.AddRange(Directory.GetDirectories("Gosu"));
            chapterList.Sort(new NumComparer());
            //load chapter pertama
            //simpan image di ram
            foreach (string item in Directory.GetFiles(chapterList[numChapter]))
            {
                imgList.Add(item);
            }
            imgList.Sort(new NumComparer());
            //buat picturebox
            this.SuspendLayout();
            foreach (string i in imgList)
            {
                Image img = Image.FromFile(i);
                PictureBox box = new PictureBox();
                box.Width = img.Width;
                box.Height = img.Height;
                box.BorderStyle = BorderStyle.FixedSingle;
                box.Image = img;
                if (boxwidth < img.Width) { boxwidth = img.Width; }
                imgLayout.Controls.Add(box);
            }
            this.Width = boxwidth+300;
            this.MinimumSize = new Size(boxwidth+300, 550);

Posted 24-Feb-17 1:50am

Yudho Sakti

Updated 24-Feb-17 2:57am

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Comments

Ralf Meier 24-Feb-17 16:23pm

You will never get a Solution if you don't work with us ...
What was wrong with my Solution ...?

2 solutions

Solution 1

Set the SizeMode of each of your Boxex to Zoom
and
at the end of this method insert the command ResumeLayout(True)
and
perhaps it could be useful to send an Invalidate to the Form

Posted 24-Feb-17 2:33am

Ralf Meier

Updated 24-Feb-17 10:25am

v2

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Alan N · Accepted Answer · 2017-02-24T02:57:00

I have seen a similar thing and had no success with various combinations of Suspend/Resume/PerformLayout. Finally I found that adding the pictureboxes to a hidden panel was effective and have had no problems since. I can't offer any explanation for the success of this method so present it as something to try.

C#

private void ShowAlbum(Image[] thumbnails) {
  List<PictureBox> pictureBoxList = new List<PictureBox>();
  foreach (Image img in thumbnails) {
    PictureBox box = new PictureBox();
    box.Image = img;
    pictureBoxList.Add(box);
  }

  flowPanel.Hide();
  flowPanel.Controls.AddRange(pictureBoxList.ToArray());
  // pbox handles are created when the container control is reshown
  flowPanel.Show();
}

Alan.