How to prevent adding duplicate items listview gridview in WPF C#?

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I have ListView with GridView(column say IteName, DataType, Value)
now I want to add item to listview But If Item is already present in Listview then I have to give message that say Item already present

I tried but not getting any solution,

Please help me to get out from this.

Thanks
Tink

What I have tried:

C#

foreach (dynamic item in lstSusbscribedGroupTag.Items)
            {
                if (if(lstSubscribeItem.Items.Contains(Item.ToString())))
                    continue;
                else
                    selectedItemCollection.Add(item);
            }

Posted 22-Mar-17 22:54pm

Member 11859517

Updated 23-Mar-17 21:23pm

v2

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CHill60 23-Mar-17 5:24am

We need to see a bit more of the code that you are using to populate the GridView! Use the Improve question link to provide the missing code

Member 11859517 23-Mar-17 5:34am

thanks CHill
I added some code as you suggested.

2 solutions

Solution 1

Search the ListView to see if the item already exists, using one of the Find(xxx) methods listed in the documentation[^].

Posted 22-Mar-17 23:26pm

Richard MacCutchan

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Graeme_Grant · Accepted Answer · 2017-03-23T21:23:00

Another simple solution is to use System.Linq; :

C#

foreach (var item in lstSusbscribedGroupTag.Items.Distinct())
{
    selectedItemCollection.Add(item);
}

If the items are of a complex type, then you need to do a little bit more work. Here are two different solutions for you:

1. Enumerable.Distinct(TSource) Method (IEnumerable(TSource)) (System.Linq)[^] (example #2)
2. c# - LINQ's Distinct() on a particular property - Stack Overflow[^]