C# Array, How to make data in an array distinct from each other? For example
string[] a = {"a","b","a","c","b","b","c","a"};
how to get
string[]b = {"a","b","c"}
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5 Answers
Easiest way is the LINQ Distinct() command :
var b = a.Distinct().ToArray();
1 Comment
arviman
Distinct returns an IEnumerable<T>. You need the the ToArray() to cast it to an array.
You might want to consider using a Set instead of an array. Sets can't contain duplicates so adding the second "a" would have no effect. That way your collection of characters will always contain no duplicates and you won't have to do any post processing on it.
Comments
var list = new HashSet<string> { };
list.Add("a");
list.Add("a");
var countItems = list.Count(); //in this case countItems=1
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An array, which you start with, is IEnumerable<T>. IEnumerable<T> has a Distinct() method which can be used to manipulate the list into its distinct values
var distinctList = list.Distinct();
Finally,IEnumerable<T> has a ToArray() method:
var b = distinctList.ToArray();
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I think using c# Dictionary is the better way and I can sort by value using LINQ