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PictureBox DataBinding

Posted on 2008-09-29
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3,062 Views
Last Modified: 2012-05-05
Hello,

I am trying to DataBind a PictureBox with a stored BLOB image in a DB2 database.

I am able to bind the image using a Binding object as seen in the code below.

My problem is the datasource HasChanged() property is always true even if I don't change the image?

Any idea as to how I can fix this?

Thanks for any help.

MAC
ON_LOAD:
Binding binding = new Binding("Image", myRecord.Tables[0], "IMAGE", true);
this.pictureBox1.DataBindings.Add(binding);
 
 
 
 
ON_IMAGE_CHANGE:
 
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "JPEG files|*.jpg|Bitmap files|*.bmp|GIF files|*.gif|All files|*";
DialogResult mResult = openFileDialog1.ShowDialog(this);
 
if (mResult == DialogResult.OK)
{
    myImageFile = openFileDialog1.FileName;
    this.pictureBox1.Image = Image.FromFile(myImageFile);
}

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Question by:mac-will
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3 Comments
 
LVL 37

Expert Comment

by:momi_sabag
ID: 22602933
which ado driver do you use?
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LVL 8

Author Comment

by:mac-will
ID: 22604568
Hi,

I use the DB2 .NET driver.
Thanks
MAC
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Accepted Solution

by:
mac-will earned 0 total points
ID: 22613456
I found my own solution.  I've posted it below for anyone who might find this useful:



You need to have an ImageChanged event.  Make a new class

   class MyPictureBox : PictureBox
    {
 
        public event EventHandler ImageChanged;
 
        //MUST USE NEW BECASUSE PictureBox.Image is not virtual
        public new Image Image
        {
            get
            {
                return base.Image;
            }
            set
            {
                bool imageChanged = base.Image != value;
 
                base.Image = value;
               
                if (imageChanged)
                {
                    this.OnImageChanged(new EventArgs());
                }
            }
        }
 
        protected virtual void OnImageChanged(EventArgs e)
        {
            ImageChanged(this, e);
        }
 
}

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