how to check if listview item is checked

Question

User chose a folder containing files. I'm making a listview displaying the files in the chosen folder. I want to display what each file contains, but i want to display it when the user checks a file from listviewitem. I'm using the following code:

if (listView1.Items[0].Checked == true)
{
   //....
}

Why doesn't it work? What should i want to use data from for example:

button1.Click(...) to button2.Click(...)?

Solution 1

Which event are you capturing? Remember if it's the ItemCheck, that you cannot use the listView1.Item[0].Checked if that item was what was checked/unchecked. You need to take the ItemCheckEventArgs parameter, and using the e.Index, exclude that element when checking the entire listview elements. Use e.NewValue to separately evaluate the item that raised the ItemCheck event.

Solution 2

Not sure exactly what you're looking for but there are a number ways to determine which items in a ListView are checked:

// This loops through only the checked items in the ListView.
foreach (ListViewItem checkedItem in listView1.CheckedItems) {
    // All these ListViewItems are checked, do something...
}

// This loops through all the items in the ListView and tests if each is checked.
foreach (ListViewItem item in listView1.Items) {
    if (item.Checked) {
        // This ListViewItem is Checked, do something...
    }
}

You can use the ListViewItem Class to examine the details of each selected item.

Comments

[John Saunders]

Which "ListView"? Web Forms? Windows Forms? WPF? SilverLight?

[p.campbell]

also consider if (listView1.Items[0].Checked)

[NotMe]

luc, when posting a question it helps to include things like error messages or at least more detail as to exactly what "doesn't work"

[luc]

there's no errors or exceptions

[Dan J]

That's not a bad WPF design, but it doesn't answer the OP's question, which was how you determine if an item in a .NET Framework ListView is checked...