c# extension method

public static class MyExtensions { //use the this keyword before an argument public static int WordCount(this String str) { return str.Split(new char[] { ' ', '.', '?' }, StringSplitOptions.RemoveEmptyEntries).Length; } }

c# add method to type

using System.Linq;
using System.Text;
using System;

namespace CustomExtensions
{
    // Extension methods must be defined in a static class.
    public static class StringExtension
    {
        // This is the extension method.
        // The first parameter takes the "this" modifier
        // and specifies the type for which the method is defined.
        public static int WordCount(this String str)
        {
            return str.Split(new char[] {' ', '.','?'}, StringSplitOptions.RemoveEmptyEntries).Length;
        }
    }
}

namespace Extension_Methods_Simple
{
    // Import the extension method namespace.
    using CustomExtensions;
  
    class Program
    {
        static void Main(string[] args)
        {
            string s = "The quick brown fox jumped over the lazy dog.";
            // Call the method as if it were an
            // instance method on the type. Note that the first
            // parameter is not specified by the calling code.
            int i = s.WordCount();
            System.Console.WriteLine("Word count of s is {0}", i);
        }
    }
}

Posted by: Guest on September-16-2020

public static class MyClassExtension { // This is the method you are adding to a class "MyClass" public static string GetValue(this MyClass myClass) { return value.toString(); } } // This is how you can use it in other parts of your code MyClass myClass = new MyClass(); string s = myClass.GetValue();

class ExtensionMethods2 { static void Main() { int[] ints = { 10, 45, 15, 39, 21, 26 }; var result = ints.OrderBy(g => g); foreach (var i in result) { System.Console.Write(i + " "); } } } //Output: 10 15 21 26 39 45

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