define extension methods c#
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);
}
}
}c# extension
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();c# extension method
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 45Copyright © 2021 Codeinu
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