How to write an efficient algorithm to set the flag on items collection

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Lets say There is a collection of Items
When item 1 added with type "grocery" more than 1 times then i need to show the popup icon on the basis of some boolean flag "isShowIcon = true/false".

when item 1 added with type "grocery" (no information popup icon)
when item 2 added with type "grocery" (show information popup icon)
when item 3 added with type "cosmetics" (no information popup icon)
when item 4 added with type "grocery" (show information popup icon)

Delete item 1 then
item 2 (no information popup icon)
item 4 (show information popup icon)

Delete item 2 then
item 4 (no information popup icon)

What I have tried:

I have tried several logic's but unable to accomplish the requirement.

Posted 15-Jul-18 13:50pm

Waqar (Vicky)

Updated 15-Jul-18 15:25pm

v2

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#realJSOP · Answer 1 · 2018-07-15T14:05:00

Solution 1

Before the new item is added, do something like this:

C#

var found = mycollection.FirstOrDefault(x=>x.name == text);
if (found == null)
{
    mycollection.Add(text);
}
else
{
    MessageBox.Show("Duplicate names are not allowed.");
}

Posted 15-Jul-18 14:05pm

#realJSOP

Updated 15-Jul-18 14:27pm

v4

Eric Lynch · Answer 2 · 2018-07-15T15:25:00

Solution 2

A System.Collections.Generic.HashSet<T> is typical for detecting duplicates. Basically, you do the following...

string text = "Some Text";

var mySet = new HashSet<string>();
if (mySet.Contains(text))
  Console.WriteLine("Duplicate!");
else
  mySet.Add(text);

Posted 15-Jul-18 15:25pm

Eric Lynch

Updated 15-Jul-18 15:27pm

v2