Reflection in C#

It is a powerful  way of collecting and manipulate information present in

Application’s assemblies and its metadata. Metadata contain all the Type

Information used by the application.

What is Reflection?

Reflection is the ability to find out information about objects, the

application details (assemblies), its metadata at run-time.

How to use Reflection in our applications?

Namespace :- System.Reflection

The Type class Base for all reflection.

Classes:-

Assembly Class: Assembly Class can be used to get the information and

Manipulate the assembly.

Module Class: Module Class is used for the reflection of the module.

This class is used to get information about parent assembly, classes in the module, all the global methods available in the classes.

ConstructorInfo Class:It is used for the reflection of a constructor, and used to fetch the information about constructor also constructor can be invoked.

Constructor information like name, parameters, access modifiers, and various implementation details (such as abstract or virtual) can be obtained.

MethodInfo Class : It is used to obtain information such as the name, return type, parameters, access modifiers (such as public or private), and implementation details  (such as abstract or virtual) of a any method inside the class, module,  assembly. GetMethods or GetMethod method of a Type are used to on the to obtain the information.

fieldInfo Class

EventInfo Class

PropertyInfo Class

ParameterInfo Class

eg:-private void Form1_Load(object sender, EventArgs e)

        {

            int i = 42;

            System.Type type = i.GetType();

            MessageBox.Show(type.ToString());

            MethodInfo[] t= type.GetMethods();

            MessageBox.Show(t[0].ToString()); 

 

  Assembly x=Assembly.LoadFrom(@"C:\Documents and Settings\abhinav\My Documents\Visual Studio

2008\Projects\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe");

  MessageBox.Show(x.FullName);

  MessageBox.Show(x.CodeBase);

   MessageBox.Show(x.EntryPoint.Name.ToString());

    MessageBox.Show(x.FullName.ToString());

  Type[] t = x.GetTypes();

   foreach (Type y in t)

          {

              MessageBox.Show(y.ToString());

          }

        Module[] p = x.GetModules();

          foreach (Module z in p)

          {

   MessageBox.Show(z.ToString());

          }

          Type gt = typeof(System.String);

          // Constructors.

          ConstructorInfo[] t9 = gt.GetConstructors(BindingFlags.Instance | BindingFlags.Public);

          foreach (MemberInfo memberInformationDetails in t9)

          {

              MessageBox.Show(memberInformationDetails.ToString());

          } 

        }

================

WindowsFormsApplication1.Form1 x = new WindowsFormsApplication1.Form1();

            Type t=x.GetType();

            MessageBox.Show(t.Assembly.FullName.ToString());

            MessageBox.Show(t.BaseType.Name.ToString());

            MethodInfo[] y=t.GetMethods();

            foreach (MethodInfo MI in y)

            {

                MessageBox.Show(MI.ToString());  

            }

            ConstructorInfo[] p1 = t.GetConstructors();

            foreach (ConstructorInfo CI in p1)

            {

                MessageBox.Show(ppp.ToString());

            }

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