LINQ list to sentence format (insert commas & “and”)

Question

I have a linq query that does something simple like:

var k = people.Select(x=>new{x.ID, x.Name});

I then want a function or linq lambda,

Answer 1

Here's one using a slightly modified version of my answer to Eric Lippert's Challenge which is IMHO the most concise with easy to follow logic (if you're familiar with LINQ).

static string CommaQuibblingMod(IEnumerable items)
{
    int count = items.Count();
    var quibbled = items.Select((Item, index) => new { Item, Group = (count - index - 2) > 0})
                        .GroupBy(item => item.Group, item => item.Item)
                        .Select(g => g.Key
                            ? String.Join(", ", g)
                            : String.Join(" and ", g));
    return String.Join(", ", quibbled);  //removed braces
}

//usage
var items = k.Select(item => String.Format("{0}:{1}", item.ID, item.Name));
string formatted = CommaQuibblingMod(items);