Question

class Category {             public string Name { get; set; }     public int Count { get; set;} }   Name Count AA   2 BB   3 AA   4 

I have an IEnumerable<Category>

and would like to get a list of Categories with unique names and the sum of multiple entries

Output

Name Count AA   6 BB   3 

Update

class Category  {  public string Name { get; set; }  public int CountA { get; set;}  public int CountB { get; set;}  public string Phone { get; set;}  } 

How would I sum two columns. and the phone column can be the last row or any row

Answer 1

var foo = new List<Category>() {                  new Category() { Name = 'AA', Count = 2},                 new Category() { Name = 'BB', Count = 3},                 new Category() { Name = 'AA', Count = 4}             };              var bar = foo.GroupBy(c => c.Name).Select(g => new Category(){ Name = g.Key, Count = g.Sum(c => c.Count) });