I want to group by category, show it's name, then show the highest id that is related to it. Here's some data and the result that I want further down. Any ideas? I've been playing around with GroupJoin but can't seem to get it to work.
My Data
var stuff = new[] {
new {id = 5, catId = 2},
new {id = 56, catId = 2},
new {id = 56, catId = 2},
new {id = 8, catId = 1},
new {id = 9, catId = 3}};
var categories = new[] {
new {catId = 1, Name = "Water"},
new {catId = 4, Name = "Wind"},
new {catId = 2, Name = "Fire"}};
What I want my results to look like
Water - 8
Wind - null
Fire - 56
categories
.GroupJoin
(
stuff,
c=>c.catId,
s=>s.catId,
(c,s)=>new
{
c.Name,
Max = s.Any() ? (int?)s.Max (m => m.id) : null
}
);
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