How to remove Duplicate items in Listview?

Question

3.00/5 (1 vote)

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C#

int i;
                 for (i = 0; i <= dt.Rows.Count - 1; i++)
                 {

                     listView2.Items.Add(dt.Rows[i].ItemArray[0].ToString());
                     listView2.Items[i].SubItems.Add(dt.Rows[i].ItemArray[1].ToString());



                 }
                 for (i = listView2.Items.Count - 1; i >= 0; i--)
                 {

                     if (listView2.Items.IndexOf(listView2.Items[i].ToString()) < i)

                         listView2.Items.RemoveAt(i);

                 }

Posted 20-Feb-15 1:16am

Member 11443427

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Member 14188342 5-May-19 12:06pm

is it write on form_load?

3 solutions

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SelectPdf · Answer 1 · 2015-02-20T01:29:00

Try something like this:

C#

//tag duplicates for removal
List<item> toRemove = new List<item>();
foreach(Item item1 in listView.Items)
{
  foreach(Item item2 in listView.Items)
  {
    //compare the two items
    if(item1.Tag == item2.Tag)
      toRemove.Add(item2);
  }
}    

//remove duplicates
foreach(Item item in toRemove)
{
  listView.Items.Remove(item);
}</item></item>

Naveen Kumar Tiwari · Answer 2 · 2015-02-20T01:37:00

Solution 2

Possibly Duplicate Question...See this Question on code project..Solution also available here

How to remove duplicate items from listView in C#.Net ?[^]

Hope this help...

Posted 20-Feb-15 1:37am

Naveen Kumar Tiwari

Updated 20-Feb-15 2:12am

v4

Comments

[no name] 20-Feb-15 7:43am

okk

[no name] 20-Feb-15 7:45am

i ask about listview not about listbox.
ok
read question carefully and then reply. understand Mr.nav29.

Naveen Kumar Tiwari 20-Feb-15 8:14am

ok sir.. now is it fine? if it helps mark it as solution..

Ramza360 · Answer 3 · 2015-02-20T04:33:00

Depending on what you want to compare, you can use Text or Tag (tag being the better choice).

C#

var tags = new HashSet<object>();
var duplicates = new List<ListViewItem>();

foreach(ListViewItem item in listView.Items)
{
    // HashSet.Add() returns false if it already contains the key.
    if(!tags.Add(item.Tag)
        duplicates.Add(item);
}

foreach(ListViewItem item in duplicates) {
    if (listView.Items.Contains(item)) {
        listView.Items.Remove(item);
    }
}

How to remove Duplicate items in Listview?

3 solutions

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