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c# only add item to list if it unique

Cute Caterpillar answered on August 25, 2022 Popularity 6/10 Helpfulness 7/10

answer c# only add item to list if it unique

c# only add item to list if it unique

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//HashSet allows only the unique values to the list
HashSet<int> uniqueList = new HashSet<int>();

var a = uniqueList.Add(1);
var b = uniqueList.Add(2);
var c = uniqueList.Add(3);
var d = uniqueList.Add(2); // should not be added to the list but will not crash the app

//Dictionary allows only the unique Keys to the list, Values can be repeated
Dictionary<int, string> dict = new Dictionary<int, string>();

dict.Add(1,"Happy");
dict.Add(2, "Smile");
dict.Add(3, "Happy");
dict.Add(2, "Sad"); // should be failed // Run time error "An item with the same key has already been added." App will crash

//Dictionary allows only the unique Keys to the list, Values can be repeated
Dictionary<string, int> dictRev = new Dictionary<string, int>();

dictRev.Add("Happy", 1);
dictRev.Add("Smile", 2);
dictRev.Add("Happy", 3); // should be failed // Run time error "An item with the same key has already been added." App will crash
dictRev.Add("Sad", 2);

Popularity 6/10 Helpfulness 7/10 Language csharp

Source: Grepper

Tags: add c# list unique

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Contributed on Aug 25 2022

Cute Caterpillar

0 Answers Avg Quality 2/10

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c# only add item to list if it unique

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