private static void Main(string[] args)
{
#region 引用类型
//string txt=null;
//var txt2 = txt;
//Console.WriteLine(txt);
#endregion
#region 可空修饰符
//int? count = null;
//if (count == null)
//{
// Console.WriteLine("null");
//}
//else
//{
// Console.WriteLine("not null");
//}
#endregion
#region 显示转换
//checked
//{
// long a = long.MaxValue;
// int b = (int)a;
// Console.WriteLine(b);
//}
#endregion
#region 空结合运算符
//checked
//{
// string a = null;
// string b = a ?? "c";
// Console.WriteLine(b);
//}
#endregion
#region 属性验证
//Employee employee = new Employee();
//employee.Initialize("aaa");
////employee.FirstName = "aaa";
//Console.WriteLine(employee.FirstName);
#endregion
#region 聚合
//Content content = new Content();
//content.internalperson = new Person();
//content.Name = "Yao Ming";
//Console.WriteLine(content.internalperson.FirstName);
#endregion
#region 封箱拆箱
var angel = new Angel();
angel._Hours = 10;
object objectAngel = angel;
Console.WriteLine(((Angel)objectAngel)._Hours);
((Angel)objectAngel).MoveTo(12);
Console.WriteLine(((Angel)objectAngel)._Hours);
((IAngel)angel).MoveTo(12);
Console.WriteLine(angel._Hours);
((IAngel)objectAngel).MoveTo(12);
Console.WriteLine(((Angel)objectAngel)._Hours);
#endregion
Console.Read();
}
private static void Main(string[] args)
{
#region 引用类型
//string txt=null;
//var txt2 = txt;
//Console.WriteLine(txt);
#endregion
#region 可空修饰符
//int? count = null;
//if (count == null)
//{
// Console.WriteLine("null");
//}
//else
//{
// Console.WriteLine("not null");
//}
#endregion
#region 显示转换
//checked
//{
// long a = long.MaxValue;
// int b = (int)a;
// Console.WriteLine(b);
//}
#endregion
#region 空结合运算符
//checked
//{
// string a = null;
// string b = a ?? "c";
// Console.WriteLine(b);
//}
#endregion
#region 属性验证
//Employee employee = new Employee();
//employee.Initialize("aaa");
////employee.FirstName = "aaa";
//Console.WriteLine(employee.FirstName);
#endregion
#region 聚合
//Content content = new Content();
//content.internalperson = new Person();
//content.Name = "Yao Ming";
//Console.WriteLine(content.internalperson.FirstName);
#endregion
#region 封箱拆箱
var angel = new Angel();
angel._Hours = 10;
object objectAngel = angel;
Console.WriteLine(((Angel) objectAngel)._Hours);
((Angel) objectAngel).MoveTo(12);
Console.WriteLine(((Angel) objectAngel)._Hours);
((IAngel) angel).MoveTo(12);
Console.WriteLine(angel._Hours);
((IAngel) objectAngel).MoveTo(12);
Console.WriteLine(((Angel) objectAngel)._Hours);
#endregion
Console.Read();
}