学步园

代码入下：

using System;
class obj_Sample_Class
{
    public int i = 10;
}
class MainClass
{
    static void Main()
    {
        object a;
        a = 100;
        Console.WriteLine(a);
        Console.WriteLine(a.GetType());
        Console.WriteLine(a.ToString());
        a = new obj_Sample_Class();
        obj_Sample_Class classRef;
        classRef = (obj_Sample_Class)a;
        Console.WriteLine(classRef.i);
    }
}