Question

Im having an issue doing something thats probably pretty simple.

My LINQ query is returning a result set of 10 objects.

Something like:

Name: Bill, Action: aaa, Id: 832758
Name: Tony, Action: aaa, Id: 82fd58
Name: Bill, Action: bbb, Id: 532758
Name: Tony, Action: bbb, Id: 42fd58

What I need to do, is to group these so that there are only 2 rows, ie one per Name, but have the ones with “Action: bbb” move into a different column. So the output would be:

Name: Bill, Action: aaa, Action_2: bbb, Id: 832758, Id_2: 532758
Name: Tony, Action: aaa, Action_2: bbb, Id: 82fd58, Id_2: 42fd58

Can anyone explain to me how I might do that?

Cheers

Answer 1

var myData = new [] 
{ 
    new { Name = "Bill", Action="aaa", Id = "832758" }, 
    new { Name = "Tony", Action="aaa", Id = "82fd58" }, 
    new { Name = "Bill", Action="bbb", Id = "532758" }, 
    new { Name = "Tony", Action="bbb", Id = "42fd58" } 
}; 

var result = myData
    .GroupBy(x=>x.Name)
    .Select(g=>new
    {
        Name = g.Key,
        Action = g.First().Action,
        Action_2 = g.Last().Action,
        Id = g.First().Id,
        Id_2 = g.Last().Id
    });

The query above assumes that you have only two rows for each name; if you have multiple rows per name, you can take the second Action/Id value by using .Skip(1).Take(1) instead of .Last()