Retrieve method information using reflection in C#

Retrieve method information using reflection in C#

Refection is very important to retrieve own assembly information. Sometimes it is needed to get information of various classes and function of current assembly. In this situation we can use reflection technique to fetch all those information. Here we will see how to get information of function from assembly.

Read function name from class using reflection.

Here we will try to read all function names from a certain class using reflection technique. In below example two functions are there within Test class. And from main function we will fetch those function name.

using System;
using System.Collections;
using System.Data.SqlClient;
using System.Threading;
using System.Data.Common;
using System.Data;
using System.Reflection;
namespace Test1
{
    class Test
    {
        public void A()
        {
        }
        public void B()
        {
        }
    }
 
   class Program
    {
       static void Main(string[] args)
       {
            Type obj = typeof(Test);
            MethodInfo[] t = obj.GetMethods();
            foreach (MethodInfo m in t)
            {
                Console.WriteLine(m.Name);
            }
            Console.ReadLine();
       } 
    }
}

Here is sample output.

Read parameter name and type

In this example we will retrieve parameter information and their types using reflection. Have a look on below code.  

using System;
using System.Collections;
using System.Data.SqlClient;
using System.Threading;
using System.Data.Common;
using System.Data;
using System.Reflection;
namespace Test1
{
    class Test
    {
        public void A(int a)
        {
        }
        public void B(String b)
        {
        }
    }
 
   class Program
    {
       static void Main(string[] args)
       {
            Type obj = typeof(Test);
            MethodInfo[] t = obj.GetMethods();
 
            foreach (MethodInfo m in t)
            {
                ParameterInfo[] p = m.GetParameters();
                foreach (ParameterInfo p1 in p)
                {
                    Console.WriteLine("Name "+ p1.Name + "   "+ 	"Paramiter
type " +  p1.ParameterType);
                }
            }
            Console.ReadLine();
       } 
    }
}

Check input or output parameter

If we want, we can check whether the parameters are input or output parameter using IsOut and IsIn property. Try to understand below example.

using System;
using System.Collections;
using System.Data.SqlClient;
using System.Threading;
using System.Data.Common;
using System.Data;
using System.Reflection;
namespace Test1
{
    class Test
    {
        public void A(int a)
        {
        }
        public void B(String b, out string c)
        {
            c = "sourav";
        }
    }
 
   class Program
    {
       static void Main(string[] args)
       {
            Type obj = typeof(Test);
            MethodInfo[] t = obj.GetMethods();
 
            foreach (MethodInfo m in t)
            {
                ParameterInfo[] p = m.GetParameters();
                foreach (ParameterInfo p1 in p)
                {
                    Console.WriteLine("Member : " +p1.Member +"Input/Output : "  + p1.IsOut.ToString());
                }
            }
            Console.ReadLine();
       } 
    }
}
 

Conclusion:-

This is the technique to retrieve information from own assembly.