Duplicate Items in Listview

Question

3.00/5 (1 vote)

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Hello Friends,
This is my Subway Resturant Project, Which is almost complete but I m facing a little problem, I m new in C# so please help me.

I want when I want to add an item in listView2 from listView1 and it already contain that item then item will not add but quantity increase.I use a code below~~(in Bold)~~ but it's not working for me, so please guide me. Thankyou!

GUI:http://imageshack.us/photo/my-images/717/guiyp.jpg/[^]

C#

if (listView2.Items.ContainsKey(listView1.Name))
                       {
                           MessageBox.Show("Duplicate");
                           //int quantity = 0;
                           //quantity = quantity + int.Parse(dRow.ItemArray.GetValue(3).ToString());
                           //item1.SubItems.Add(quantity.ToString());

                       }
                       else
                       {
                           listView1.Focus();
                           item1.SubItems.Add(dRow.ItemArray.GetValue(2).ToString());
                           listView2.Items.AddRange(new ListViewItem[] { item1/*,item2,item3*/ });
                           item1.SubItems.Add(dRow.ItemArray.GetValue(3).ToString());

                       }

Posted 5-May-12 17:47pm

princeshils

Updated 5-May-12 19:01pm

Sandeep Mewara

v4

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Sergey Alexandrovich Kryukov 6-May-12 1:01am

Reason for my vote of 3
Pointless long code dump, very bad code, and -- very bad site. Repelling pictures and title not graphically related (inconsistent disgusting shadows and outline), unrelated content, and -- a very bad sin -- a pop up, very annoying. Decent people usually close such pages before they read what is is about, will hardly ever use the service.

If you want so show the code (in most cased you should), create a complete but very short code sample showing only one problem and nothing else.

--SA

Sandeep Mewara 6-May-12 1:01am

Removed whole code dump and just kept the related code snippet.

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-05-05T19:07:00

First of all, don't work with UI, work with data. The UI should get into play when all the data is already prepared. Separate data model from UI.

The ready-to-use data structures preventing duplicates are the following generic types:

System.Collections.Generic.Dictionary<,><br />
System.Collections.Generic.SortedDictionary<,><br />
System.Collections.Generic.SortedList<,>

Please see:
http://msdn.microsoft.com/en-us/library/system.collections.generic.aspx[^],
http://msdn.microsoft.com/en-us/library/xfhwa508.aspx[^],
http://msdn.microsoft.com/en-us/library/f7fta44c.aspx[^],
http://msdn.microsoft.com/en-us/library/ms132319.aspx[^].

Good luck,

—SA