csharp 构造函数的有参和无参函数的区别.

构造函数中, 如果B类继承于A类时候, 那么B类先条用父类A的构造函数:

using System;
class A
{
  public A()
  {
  Console.WriteLine("A without any parameter.");
  }
  public A(int i)
  {
  Console.WriteLine("A with a parameter.");
  }

}

class B: A
{
  public B()
  {
  Console.WriteLine("B without any parameters.");
  }
  public B (int i)
  {
  Console.WriteLine("B with a parameter");
  }

}
class classcompare
{
  public static void Main(){
   B a =new B();
   
   
   }

 
}

结果:

A without any parameter.
B without any parameters.