How to convert List to HashSet in C#? [duplicate]

Answer 1

An alternative way would be

var yourlist = new List();

// [...]

var uniqueObjs = yourlist.Distinct();  //Gives you a List with unique Objects of the List.

Note that this is only possible, if SomeClass overrides GetHashCode and Equals in some way. This is also true for

var uniqueObjs = new HashSet(yourOriginalList);

Otherwise you could implement you own IEqualityComnparer-class and pass it to distinct.

Note that with the Distinct() approach, you can also look for distinct property values of the object in the list:

var uniqueNames = yourlist.Select(obj => obj.Name).Distinct(); 

and some more...