replace imagelist item with a new image

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I have filled an imagelist using the following code in a button click. everything works fine.

C#

DirectoryInfo dir = new DirectoryInfo(@"c:\MyPic");
foreach (FileInfo file in dir.GetFiles())
{
imageList1.Images.Add(Image.FromFile(file.FullName));
}

listView1.View = View.LargeIcon;
imageList1.ImageSize = new Size(100, 100);
listView1.LargeImageList = this.imageList1;
ListViewItem item;
for (int i = 0; i < this.imageList1.Images.Count; i++)
{
    item = new ListViewItem();
    item.ImageIndex = i;
    item.Text = "Image " + i.ToString();
    listView1.Items.Add(item);
}

But when i replace any image in the imagelist and refresh the list box then the full image is not displayed, a portion of the image is displayed. Codes are as follows:

C#

imageList1.Images[listView1.FocusedItem.ImageIndex] = img;  // here I replace the image at a specific place
 
listView1.Refresh();

I think I have to change the imagelayout as stretch. But how could i do that? and why the full image is displayed at first time?

Posted 28-Jan-12 23:14pm

akul123

Updated 28-Jan-12 23:34pm

Michel [mjbohn]

v2

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Michel [mjbohn] 29-Jan-12 5:38am

code tags added

Manisha Tambade 29-Jan-12 6:03am

hi,Same thing happened with me but i was using imagelist by drag n drop method and not by coding like you..y
At the end i found image file size difference.So u check file size of both image,hope so u get problem solved..

2 solutions

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Espen Harlinn · Answer 1 · 2012-01-28T23:44:00

Solution 1

Have a look at ObjectListView[^]

It makes what you are trying to do a lot easier :)

In your case I think I'd use owner drawing [^].

Best regards
Espen Harlinn

Posted 28-Jan-12 23:44pm

Espen Harlinn

Comments

akul123 29-Jan-12 8:23am

since at the first time it can be done using ListView so why it can not be possible in case of replacing. I think in case of replacing somehow any property of listview or imagelist has been changed that I have to rechange.

Espen Harlinn 29-Jan-12 8:31am

An imagelist is basically a large image composed of smaller images - adding and removing those smaller images from the larger image is not particularly efficient.

Vzhikserg · Answer 2 · 2015-12-15T11:19:00

This is the way how to solve this problem:
1. Remove the image from the image collection by key.
2. Add a new image with the same key to the image collection.

C#

Image newImage = ... // new image
string imgKey = ... // the key of the image to update
// find the previous image by key
Image previousImage = imgList.Images[imgList.Images.Keys.IndexOf("imgKey")];
// remove the previous image from the collection
imgList.Images.RemoveByKey(imgKey);
// dispose the previous image
previousImage.Dispose();            
// add a new image
imgList.Images.Add(imgKey, newImage);