static void Main(string[] args)
{
try
{
Console.WriteLine("**********************Lambda + Linq*************************");
{
Console.WriteLine("**************************Lambda*********************");
LambdaShow lambdaShow = new LambdaShow();
lambdaShow.Show();
}
{
//匿名类
object model = new
{
id = 2,
Name = "",
Age = 25,
ClassId = 2
};
// Console.WriteLine(model.id); //object 编译器不允许
dynamic dModel = new // 4.0
{
id = 2,
Name = "",
Age = 25,
ClassId = 2
};
Console.WriteLine(dModel.id);
// var 是一个语法糖, 由编译器自动推算
// var 必须在声明时就确定类型
// var 确定类型后不能改变的
//
var vModel = new //3.0 编译后是有一个真实的类
{
id = 2,
Name = "",
Age = 25,
ClassId = 2
};
//vModel.id = 3; //匿名类里面的属性只能Get不能被赋值， 只能在构造函数指定
Console.WriteLine(vModel.id);
}
{
//扩展方法 3.0 想要增加方法但是又不想改变原有的类
Student student = new Student()
{
Id = 2,
Name = "Ivan",
Age = 25,
ClassId = 2
};
student.Study();
student.Sing();
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
//throw;
}
Console.ReadKey();
}
static void Main(string[] args)
{
{
Console.WriteLine("***************Lambda*****************");
LambdaShow lambdaShow = new LambdaShow();
lambdaShow.Show();
}
{
object o1 = new
{
Id = 3,
age = 25
};
// o1.Id //not work
dynamic o2 = new
{
Id = 3,
age = 25
};
Console.WriteLine(o2.Id); //dynamic could ignore the compiler checking.
var o3 = new
{
Id = 3,
age = 25
};
Console.WriteLine(o3.Id); //dynamic could ignore the compiler checking.
}
#region ExtendMethod
{
Student student = new Student()
{
Id = 1,
Name = "Jason",
Age = 25,
ClassId = 2
};
string s = null;
student.Study();
student.StudyHard();
//又要增加方法 又不想(不能)修改
student.Sing();
ExtendMethod.Sing(student);
int?iValue = null;
int r1 = iValue.ToInt(0);
int i1 = 2, i2 = 4;
bool r2 = i1.greaterThan(i2);
int r3 = student.Length();
}
#endregion
#region linq
{
Console.WriteLine("***************Linq*****************");
LinqShow show = new LinqShow();
show.Show();
}
#endregion
Console.Read();
}
