C# Language Where

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Returns a subset of items which the specified predicate is true for them.

List<string> trees = new List<string>{ "Oak", "Birch", "Beech", "Elm", "Hazel", "Maple" };

Method syntax

// Select all trees with name of length 3
var shortTrees = trees.Where(tree => tree.Length == 3); // Oak, Elm

Query syntax

var shortTrees = from tree in trees
                 where tree.Length == 3
                 select tree; // Oak, Elm