CSHARP

extension method in c#

class Program
    {
        static void Main(string[] args)
        {
            string post = "This is supposed to be a very long blog post blah blah blah...";
            var shortenedPost = post.Shorten(5);
 			Console.WriteLine(shortenedPost);
          
           IEnumerable<int> numbers = new List<int>() { 1, 5, 3, 10, 2, 18 };
           var max = numbers.Max();
           Console.WriteLine(max);
           Console.ReadLine();
        }
    }
public static class StringExtensions
    {
        public static string Shorten(this String str, int numberOfWords)
        {
            if (numberOfWords < 0)
                throw new ArgumentOutOfRangeException("numberOfWords should be greater than or equal to 0.");

            if (numberOfWords == 0)
                return "";

            var words = str.Split(' ');

            if (words.Length <= numberOfWords)
                return str;

            return string.Join(" ", words.Take(numberOfWords)) + "...";
        }
    }

Extension method C#

public static void ExtensionMethodName(this ClassToExtend o)
{
    //Do stuff
}

extension method c#

// list of useful extension methods
https://www.extensionmethod.net/csharp
https://csharp-extension.com/