Question

For example:

The list is list of Users

First entry: User -> Id=111 name=aaa

First entry: User -> Id=123 name=aaa

First entry: User -> Id=124 name=ccc

First entry: User -> Id=125 name=ddd

First entry: User -> Id=126 name=ddd

The result if the param is Id is 5 and if it’s name it will be 3 (because there is 3 unique names)

The expected output is the count of Users with provided parameter when this param is distinct.

Thanks in advance

Answer 1

If I understand your question correctly (you want to know the count of users having a distinct Id or distinct Name), you could do the following:

int uniqueByIdCount = list.Select(x => x.Id).Distinct().Count();
int uniqueByNameCount = list.Select(x => x.Name).Distinct().Count();