error - Unable to cast object of type, wpf Listview

Abhilash J A

9y3k

Hello everyone,

After bind listview with linq query, occuring error.

how can I solve this error ? Unable to cast object of type 'Grouping[System.String,<>

public UC_ArcMgmt()
{
InitializeComponent();
DMSBusinessLayer service = new DMSBusinessLayer();
listView1.ItemsSource = service.GetArchivedList().SelectMany((x) => new[] { new { Id = x.Id, ArchievedName = x.ArchievedName, UpdatedDate = x.UpdatedDate, FileSize = FormatBytes(x.fsize), docCount = x.docCount } }).Distinct()
GroupBy((x) => x.ArchievedName);
}
1. private void btn_Click(object sender, MouseButtonEventArgs e)
2. {
3. foreach (Tble_Documents item in listView1.SelectedItems) /*here showing error*/
4. {
5. int DocId = Convert.ToInt32(item.Id);
6. }
7. }

5 Replies

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Amit Gupta9y ago
Is Tble_Documents your ItemSource? As you had not shared its snippet
for (int x=0; x < listview1.SelectedItems.Count; x++)
{
var doc = (Tble_Documents) listview1.SelectedItems [x];
var docId = doc.id
// do your stuff here with doc
}
Abhilash J A9y ago
Hello Amit,

Yes, the listView1.SelectedItems is return an array. Then, how can retrieve selected DocId with respect to this situation ?
Amit Gupta9y ago
Oh!! This can't be cast to another class as your itemsource is different than that you are trying to fetch.

listView1.ItemsSource = service.GetArchivedList()

Look at return type of your method GetArchivedList (), it will be unboxed in that class only in your for loop. As you had not shared that snippet
Abhilash J A9y ago
Yes.But I did try that still error occured.
Amit Gupta9y ago
I believe that same has been answered in your previous question, anyway...
Do unboxing before you cast
for (int x=0; x < listview1.SelectedItems.Count; x++)
{R
var doc = (Tble_Documents) listview1.SelectedItems [x];
// do your stuff here with doc
}