Nullable<>基础应用

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace NullableDemo

{

class Employee

{

private string name;

public string Name

{

get { return name; }

set { name = value; }

}

private bool isMarried;

public bool IsMarried

{

get { return isMarried; }

set { isMarried = value; }

}



// marriedTime实际上还是一个DateTime类型

private Nullable<DateTime> marriedTime;

public Nullable<DateTime> MarriedTime

{

get

{

return this.marriedTime;

}

set

{

if (!this.isMarried)

this.marriedTime = null;

else

this.marriedTime = value;

}

}

public Employee(string name, bool ismarried)

{

this.name = name;

this.isMarried = ismarried;

}

public void ShowInfo()

{

Console.WriteLine("Name:{0}", this.Name);

Console.WriteLine("Married:{0}", this.isMarried ? "Yes" : "No");

if (this.MarriedTime.HasValue)

{

Console.WriteLine("Anniversary:{0:MMMM d}", this.MarriedTime);

}

else

{

Console.WriteLine("Anniversary:none");

}

}

static void Main(string[] args)

{

Employee e1 = new Employee("Tom", true);

e1.marriedTime = Convert.ToDateTime("1990-1-1");

e1.ShowInfo();



Employee e2 = new Employee("Lily", false);

e2.ShowInfo();



Console.ReadLine();

}

}



}