Lab 2

Student Sample Programs/Chap13/LambdaPassingDemo/LambdaPassingDemo/Form1.cs

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+using System;
+using System.Windows.Forms;
+
+namespace LambdaPassingDemo
+{
+    delegate void IntRefOperation(ref int x);
+
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private void ArrayStepper(int[] array, IntRefOperation op)
+        {
+            for (int index = 0; index < array.Length; index++)
+            {
+                op(ref array[index]);
+            }
+        }
+
+        private void demoButton_Click(object sender, EventArgs e)
+        {
+            // Create an int array with 4 elements.
+            int[] numbers = { 10, 20, 30, 40 };
+
+            // Display the contents of the array.
+            ArrayStepper(numbers, (ref int x) => MessageBox.Show(x.ToString()));
+
+            // Set each array element to 0.
+            ArrayStepper(numbers, (ref int x) => x = 0);
+
+            // Display the contents of the array.
+            ArrayStepper(numbers, (ref int x) => MessageBox.Show(x.ToString()));
+        }
+    }
+}