In 3 minutes, What is Reflection?

Question

Many .Net interview question lists (including the good ones) contain the question: \"What is Reflection?\". I was recently asked to answer this in the context of a 5 questio

Answer 1

By using Reflection in C#, one is able to find out details of an object, method, and create objects and invoke methods at runtime.

using System;
using System.Reflection;

public class MyClass
{
   public virtual int AddNumb(int numb1,int numb2)
   {
     int result = numb1 + numb2;
     return result;
   }

}

class MyMainClass
{
  public static int Main()
  {
    // Create MyClass object
    MyClass myClassObj = new MyClass();
    // Get the Type information.
    Type myTypeObj = myClassObj.GetType();
    // Get Method Information.
    MethodInfo myMethodInfo = myTypeObj.GetMethod("AddNumb");
    object[] mParam = new object[] {5, 10};
    // Get and display the Invoke method.
    Console.Write("\nFirst method - " + myTypeObj.FullName + " returns " +  
                         myMethodInfo.Invoke(myClassObj, mParam) + "\n");
    return 0;
  }
}

below code will get the type information:

Type myTypeObj = Type.GetType("MyClass");

The code snippet below will get the method's information

Methodinfo myMethodInfo = myTypeObj.GetMethod("AddNumb"); 

The following code snippet will invoke the AddNumb method:

myMethodInfo.Invoke(myClassObj, mParam);