If your query's lambda expressions reference local variables, these variables are subject to outer variable semantics. : Lambda : LINQ C# Source Code

If your query's lambda expressions reference local variables, these variables are subject to outer variable semantics.

    
 

using System;
using System.Collections.Generic;
using System.Linq;
public class MainClass {
    public static void Main() {

        int[] numbers = { 1, 2 };

        int factor = 10;
        IEnumerable<int> query = numbers.Select(n => n * factor);

        factor = 20;
        foreach (int n in query) Console.Write(n + "|");   
    }
}

 
    
   
  
   

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• Lambda expression used to declare an expression tree
• return a lambda function
• A local variable instantiated within a lambda expression is unique per invocation of the delegate instance.
• square is assigned the lambda expression x = > x * x
• A lambda expression has the following BNF form
• A lambda expression can reference the local variables and parameters of the method in which it's defined.