Csharp/C Sharp by API/System.Reflection/ConstructorInfo

ConstructorInfo.GetParameters()

using System; 
using System.Reflection; 
 
class MyClass { 
  public MyClass(int i) { 
    Console.WriteLine("Constructing MyClass(int). "); 
  } 
 
  public MyClass(int i, int j) { 
    Console.WriteLine("Constructing MyClass(int, int). "); 
  } 
 
  public int sum() { 
    return 0; 
  } 
 
  public bool isBetween(int i) { 
    return false; 
  } 
 
  public void set(int a, int b) { 
    Console.Write("Inside set(int, int). "); 
  } 
 
  public void set(double a, double b) { 
    Console.Write("Inside set(double, double). "); 
  } 
 
  public void show() { 
    Console.WriteLine("Values"); 
  } 
} 
 
class MainClass { 
  public static void Main() { 
    Type t = typeof(MyClass); 
 
    // Get constructor info. 
    ConstructorInfo[] ci = t.GetConstructors(); 
 
    Console.WriteLine("Available constructors: "); 
    foreach(ConstructorInfo c in ci) { 
      // Display return type and name. 
      Console.Write("   " + t.Name + "("); 
 
      // Display parameters. 
      ParameterInfo[] pi = c.GetParameters(); 
 
      for(int i=0; i < pi.Length; i++) { 
        Console.Write(pi[i].ParameterType.Name + " " + pi[i].Name); 
        if(i+1 < pi.Length) 
           Console.Write(", "); 
      } 
 
      Console.WriteLine(")"); 
    } 
    Console.WriteLine(); 
  } 
}

ConstructorInfo.Invoke

using System;
using System.Text;
using System.Reflection;
class MainClass
{
    public static void Main ()
    {
        Type type = typeof(StringBuilder);
        Type[] argTypes = new Type[] { typeof(System.String), typeof(System.Int32) };
        ConstructorInfo cInfo = type.GetConstructor(argTypes);
        object[] argVals = new object[] { "Some string", 30 };
        // Create the object and cast it to StringBuilder.
        StringBuilder sb = (StringBuilder)cInfo.Invoke(argVals);
        Console.WriteLine(sb);
    }
}