How to get max element in a string array by linq?

Question

Consider I have an array like the following one:

string[] Files = {"NO. 1", "NO. 2", "NO. 3", "NO. 4", "NO. 5", "NO. 6", "NO. 7"};

I want to find the element with the maximum number. How can I do this by Linq queries in C#?

Read about linq linq Select, int.Parse, linq Max, string.indexOf, string.Substring :P — Piotr Auguscik
– Piotr Auguscik, Commented Jan 28, 2012 at 8:46
What do you mean with maximum number? Do you want to parse the number from the "NO. X" string, where X is the required number and select the string with the highest X? — stmax
– stmax, Commented Jan 28, 2012 at 8:52
If the string "NO." is a constant (i.e. it never changes), then just use "var highest = Files.OrderByDescending(x => x).First()". — Ben Smith
– Ben Smith, Commented Nov 5, 2013 at 22:57

perfectionist · Accepted Answer · 2012-01-28 09:25:46Z

If you are using LINQ to objects (rather than to a database)... then this'll do it.

string[] Files = { "NO. 1", "NO. 2", "NO. 3", "NO. 4", "NO. 5", "NO. 6", "NO. 7" }; var max = Files.OrderByDescending(x => int.Parse(x.Replace("NO. ", ""))).First();

The exact string manipulation will of course change if your list is some way different to what you posted.

There may be more elegant LINQ functions you can use, but these are the ones I found.

The answer I originally posted was var z = Files.Max(x => int.Parse(x.Replace("NO. ", ""))); which retrieves the max number, not the max element.

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