Reflection API & Extension Methods:-

 

What is Reflection?

Reflection lets you inspect and use classes, methods, properties at runtime — even if you don’t know them at compile time.

✅ Example: Get Class Info at Runtime

using System;
using System.Reflection;

class Employee
{
    public int Id { get; set; }
    public string Name { get; set; }

    public void Display()
    {
        Console.WriteLine("Employee Display Method");
    }
}

class Program
{
    static void Main()
    {
        Type type = typeof(Employee);

        Console.WriteLine("Class Name: " + type.Name);

        Console.WriteLine("\nProperties:");
        foreach (PropertyInfo prop in type.GetProperties())
        {
            Console.WriteLine(prop.Name);
        }

        Console.WriteLine("\nMethods:");
        foreach (MethodInfo method in type.GetMethods())
        {
            Console.WriteLine(method.Name);
        }
    }
}


➕ Extension Method Example
What is an Extension Method?
Allows you to add methods to existing classes without modifying them.

✅ Example: Extend string class
Step 1: Create Extension Class
using System;

static class StringExtensions
{
    public static bool IsEmail(this string value)
    {
        return value.Contains("@") && value.Contains(".");
    }
}

Step 2: Use Extension Method
class Program
{
    static void Main()
    {
        string email = "test@gmail.com";

        bool result = email.IsEmail();

        Console.WriteLine(result);
    }
}