.Net Reflection

[vc_row][vc_column width=”1/1″][vc_column_text animation=”no_animation”].Net provides best functionality of reflection to modify structure and behaviour of programming. .NET Framework’s Reflection API allows you to programmatically discover class information solely at run time.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width=”1/4″][vc_column_text animation=”no_animation”][/vc_column_text][/vc_column][vc_column width=”3/4″][vc_column_text animation=”no_animation”]In the computer science, .Net Reflection is the process in which the computer program can observe and modify its own structure and behaviour. It is mainly used to to load a .net assembly into memory programmatically. This is exactly how Reflection in C# works, and while you may not realize it at this point, being able to examine and change information about your application during runtime in C#.

Through the Reflection, you can get information on the methods, properties, fields, and events of an object, which you can see in a class viewer.

The System.Reflection namespace and the System.Type class play an important role in .NET Reflection. These allow you to reflect over many other aspects of a type.[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width=”1/1″][vc_column_text animation=”no_animation”]Below is the Demo1 and Demo2 for example to learn about reflection:

Demo1


using System;
using System.Reflection;

public class ReflactionDemo
{
public virtual int AdditionofNumber(int n1,int n2)
{
int result = n1 + n2;
return result;
}

}

class RefDemoMyRefClass
{
public static int Main()
{
Console.WriteLine (“MethodInfo”);
ReflactionDemo ReflactionDemoObj = new ReflactionDemo();

Type RefObj = ReflactionDemoObj.GetType();

MethodInfo DemoMethodInfo = RefObj.GetMethod(“AdditionofNumber”);
object[] RefParam = new object[] {5, 10};

Console.Write(“\nFirst method – ” + RefObj.FullName + ” returns ” + DemoMethodInfo.Invoke(ReflactionDemoObj, RefParam) + “\n”);
return 0;
}
}

get the type information
Type RefObj = Type.GetType(“ReflactionDemo”);
And RefObj will now have the required information about ReflactionDemo. Therefore we can now check if the class is an abstract class or a regular class
RefObj.IsClass or RefObj.IsAbstract

get the method’s information. And the method that we are interested in this case is AdditionofNumber

Demo2


Public class ReflactionDemo2
{
int answer;
public ReflactionDemo2()
{
answer = 0;
}
public int AdditionofNumber(intn1, intn2)
{
answer = n1 + n2;
return answer;
}
}

gets the System.Type object for the ReflactionDemo2 type.’

Type Reftype = typeof(ReflactionDemo2);


So we will now be able to create an instance of the Reftype object by passing the Reftype object to the Activator.CreateInstance(Reftype) method.

object obj = Activator.CreateInstance(Reftype);


Afterward, we can invoke the AdditionofNumber method of the ReflactionDemo2 class by first creating an array of objects for the arguments that we would be passing to the


AdditionofNumber(int, int) method.
object[] RefParam =newobject[] {5014, 6584};


Finally, we would invoke the AdditionofNumber(int, int) method by passing the method name AdditionofNumber to System.Type.InvokeMember() with the appropriate arguments.


int res = (int)Reftype.InvokeMember("AdditionofNumber", BindingFlags.InvokeMethod,null,obj, RefParam);


Here is the full Example of reflaction:


using System;
using System.Reflection;
namespace Reflection
{
class MyRefClass
{
public int AdditionofNumber(int n1, int n2)
{
int ans = n1 + n2;
return ans;
}
[STAThread]
static void Main(string[] args)
{
Type Reftype = typeof(MyRefClass);
object obj = Activator.CreateInstance(Reftype);
object[] RefParam = new object[] {5, 10};
int res = (int)Reftype.InvokeMember("AdditionofNumber", BindingFlags.InvokeMethod,null, obj, RefParam);
Console.Write("Result: {0} \n", res);
}
}
}


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