Reflection in C#

Reflection objects are used to obtain type information at runtime. Classes that allow access to a running program's metadata are located in the System.Reflection namespace.

The following is an application of Reflections -

• It allows viewing property information at runtime.

• It allows checking various types in an assembly and instantiating these types.

• It allows late binding to methods and properties

• It allows creating new types at runtime and then using these types to perform some tasks.

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Let’s see an example -

Example

using System;

[AttributeUsage(AttributeTargets.All)]
public class HelpAttribute : System.Attribute {
   public readonly string Url;

   public string Topic // Topic is a named parameter {
      get {
         return topic;
      }
      set {
         topic = value;
      }
   }
   public HelpAttribute(string url) // url is a positional parameter {
      this.Url = url;
   }
   private string topic;
}

[HelpAttribute("Information on the class MyClass")]
   class MyClass {
}

namespace AttributeAppl {
   class Program {
      static void Main(string[] args) {
         System.Reflection.MemberInfo info = typeof(MyClass);
         object[] attributes = info.GetCustomAttributes(true);

         for (int i = 0; i < attributes.Length; i++) {
            System.Console.WriteLine(attributes[i]);
         }
         Console.ReadKey();
      }
   }
}

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