private static void ObjectInitializer()
{
var student1 = new StudentName("QI", "Xing");
var student2 = new StudentName {
FirstName = "QI", LastName = "Xing"
};
var student3 = new StudentName {
ID = 100
};
var student4 = new StudentName("Wu", "Shuang")
{
ID = 101
};
Console.WriteLine(student1.ToString());
Console.WriteLine(student2.ToString());
Console.WriteLine(student3.ToString());
Console.WriteLine(student4.ToString());
}
private static void ObjectInitializer()
{
var student1 = new StudentName("MeiMei", "Wang");
//先调用无参的构造函数
var student2 = new StudentName()
{
FirstName = "MeiMei", LastName = "Wang"
};
var student3 = new StudentName()
{
ID = 103
};
var student4 = new StudentName("Lei", "Li")
{
ID = 104
};
Console.WriteLine(student1);
Console.WriteLine(student2);
Console.WriteLine(student3);
Console.WriteLine(student4);
}
static void Main(string[] args)
{
// 初始化器实现方法
var student1 = new StudentName("Meimei", "Wang");//调用的是构造函数是public StudentName(string first,string last)
var student4 = new StudentName("Meimei", "Wang")
{
ID = 101
}; //调用的是构造函数是public StudentName(string first,string last)
var student2 = new StudentName()
{
FirstName = "Meimei", LastName = "Wang", ID = 101
}; //调用的是构造函数是public StudentName()
var student3 = new StudentName {
FirstName = "Meimei", LastName = "Wang", ID = 101
}; //调用的是构造函数是public StudentName()
// 匿名类的初始化器
// 匿名类的属性是只读的
var pet = new { Age = 10, Name = "Meimei" };
string name = pet.Name;
//pet.Name = "无法更改";
// 匿名类初始化器常用于Linq语句
List <StudentName> slist = new List <StudentName>();
var query = from n in slist
select new { FirstName = n.FirstName, LastName = n.LastName, Id = n.ID };
// 集合初始化器
var students = new List <StudentName>()
{
new StudentName("Meimei", "Wang"),
new StudentName("Meimei", "Wang")
{
ID = 101
},
new StudentName()
{
FirstName = "Meimei", LastName = "Wang", ID = 101
},
new StudentName {
FirstName = "Meimei", LastName = "Wang", ID = 101
},
null //还可以包含null
};
Dictionary <int, StudentName> studentsDic = new Dictionary <int, StudentName>()
{
{ 101, new StudentName("Meimei", "Wang") },
{ 102, new StudentName("Meimei", "Wang")
{
ID = 101
} },
{ 103, new StudentName()
{
FirstName = "Meimei", LastName = "Wang", ID = 101
} },
{ 104, new StudentName {
FirstName = "Meimei", LastName = "Wang", ID = 101
} }
};
foreach (var item in studentsDic)
{
// item.Value就是一个StudentName对象
Console.Write(item.Value);
}
}