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C# Academy · Lesson

Type, MethodInfo, activation, custom attributes

Get Type objects, locate MethodInfo, invoke methods, create instances with Activator, and define/read custom attributes.

Overview

Goal: Use reflection safely.

  • Get Type
  • Find MethodInfo
  • Create via Activator
  • Define & read attributes

Get Type

Get Type from typeof, an instance with GetType(), or by name via Type.GetType.

using System;

public class Sample { }

public class Program
{
  public static void Main(string[] args)
  {
    // 1) From a compile-time type
    Type t1 = typeof(Sample);

    // 2) From an instance
    Sample s = new Sample();
    Type t2 = s.GetType();

    // 3) From a full name (needs assembly-qualified name for external types)
    Type t3 = Type.GetType("System.String");

    Console.WriteLine(t1.Name + ", " + t2.FullName + ", " + (t3 == null ? "null" : t3.Name));
  }
}

All lessons in this course

  1. Type, MethodInfo, activation, custom attributes
  2. Source-level info (Caller attributes)
  3. Light metaprogramming scenarios
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