static void Main(string[] args)
{
try
{
int iValue = 123;
string sValue = "456";
DateTime dtValue = DateTime.Now;
object oValue = new object();
Console.WriteLine(typeof(List <int>));
Console.WriteLine(typeof(Dictionary <string, int>));
Console.WriteLine("*************************************");
CommonMethod.ShowInt(iValue);
CommonMethod.ShowString(sValue);
CommonMethod.ShowDateTime(dtValue);
Console.WriteLine("*************************************");
CommonMethod.ShowObject(oValue);
CommonMethod.ShowObject(iValue);
CommonMethod.ShowObject(sValue);
CommonMethod.ShowObject(dtValue);
Console.WriteLine("*************************************");
GenericMethod.Show <object>(oValue);
GenericMethod.Show <int>(iValue);
GenericMethod.Show(iValue);//类型参数可以省略，由编译器推断
GenericMethod.Show <string>(sValue);
GenericMethod.Show <DateTime>(dtValue);
Console.WriteLine("*************************************");
GenericConstraint.Show <People>(new People {
Id = 1001, Name = "lucy"
});
GenericConstraint.Show <Chinese>(new Chinese {
Id = 1002, Name = "Coco"
});
GenericConstraint.Show <JiangXi>(new JiangXi {
Id = 1003, Name = "Jack"
});
//GenericConstraint.Show<int>(1);//约束后，只能按约束传递
//GenericConstraint.ShowInterface<People>(new People { Id = 1001, Name = "lucy" });
GenericConstraint.ShowInterface <Chinese>(new Chinese {
Id = 1002, Name = "Coco"
});
GenericConstraint.ShowInterface <JiangXi>(new JiangXi {
Id = 1003, Name = "Jack"
});
GenericConstraint.ShowInterface <Japanese>(new Japanese {
Id = 1004, Name = "鬼子"
});
#region Monitor
long commonTime = 0;
long objectTime = 0;
long genericTime = 0;
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
for (int i = 0; i < 1000000000; i++)
{
ShowCommon(iValue);
}
stopwatch.Stop();
commonTime = stopwatch.ElapsedMilliseconds;
}
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
for (int i = 0; i < 1000000000; i++)
{
ShowObject(oValue);//装箱，值类型是分配在栈上的，引用类型是分配在堆上的
}
stopwatch.Stop();
objectTime = stopwatch.ElapsedMilliseconds;
}
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
for (int i = 0; i < 1000000000; i++)
{
ShowGeneric <int>(iValue);
}
stopwatch.Stop();
genericTime = stopwatch.ElapsedMilliseconds;
}
Console.WriteLine("commonTime={0} objectTime={1} genericTime={2}", commonTime, objectTime, genericTime);
#endregion
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.Read();
}
static void Main(string[] args)
{
try
{
// 欢迎大家来到.Net 高级班的Vip课程，我是Richard老师！
// 今天是第十三期的第一次课：泛型
//什么是泛型？
//宽泛的，不确定的，就是不确定的类型
//List<string> intlist = new List<string>();
// var i = 1234; // 语法糖
Console.WriteLine(typeof(List <>));
Console.WriteLine(typeof(Dictionary <,>));
Console.WriteLine("欢迎来到.net高级班vip课程，今天是Richard老师给大家带来的泛型Generic");
int iValue = 123;
string sValue = "456";
DateTime dtValue = DateTime.Now;
object oValue = "789";
Console.WriteLine("***********************Common***********************");
CommonMethod.ShowInt(iValue);
CommonMethod.ShowString(sValue);
CommonMethod.ShowDateTime(dtValue);
Console.WriteLine("***********************Object***********************");
CommonMethod.ShowObject(oValue);
CommonMethod.ShowObject(iValue);
CommonMethod.ShowObject(sValue);
CommonMethod.ShowObject(dtValue);
Console.WriteLine("***********************Generic***********************");
// 泛型只有：泛型方法、泛型类、泛型接口、泛型委托
//泛型方法调用的时候，需要加上<>,而且需要指定具体的类型、指定的类型和传入的参数类型保持一致。
CommonMethod.Show(iValue); //如果类型参数，可以通过参数类型推导出来，那么就可以省略
/* CommonMethod.Show<int>(sValue);*/ // 因为类型错了
CommonMethod.Show(sValue);
CommonMethod.Show <DateTime>(dtValue);
CommonMethod.Show <object>(oValue);
//Monitor.Show();
Console.WriteLine("***********************GenericCache***********************");
//GenericCacheTest.Show();
//泛型方法 一个方法满足多个类型的需求
//泛型类 就是一个类 满足多个类型的需求
//泛型接口 就是一个接口 满足多个多个类型的需求
//泛型委托 就是一个委托 满足多个多个类型的需求
//GenericConstraint.ShowObject(iValue);
//GenericConstraint.ShowObject(sValue);
//GenericConstraint.ShowObject(dtValue);
//GenericConstraint.ShowObject(oValue);
Console.WriteLine("***********************GenericConstraint***********************");
// 泛型约束的好处：
// 加了约束以后可以获取更多的功能；
// 程序在调用的时候可以避免错误调用
People people = new People()
{
Id = 123,
Name = "Richard"
};
Chinese chinese = new Chinese()
{
Id = 234,
Name = "习大大"
};
Hubei hubei = new Hubei()
{
Id = 345,
Name = "王市长"
};
Japanese japanese = new Japanese()
{
Id = 678,
Name = "福原爱"
};
// Object 方法因为可以出入任何类型，没有限制，如果传入的类型不匹配，就会发生异常（类型安全问题）
//GenericConstraint.ShowObject(people);
//GenericConstraint.ShowObject(chinese);
//GenericConstraint.ShowObject(hubei);
//GenericConstraint.ShowObject(japanese);
//GenericConstraint.Show(people);
//GenericConstraint.Show(chinese);
//GenericConstraint.Show(hubei);
//GenericConstraint.Show(japanese);//
// GenericConstraint.GenericShow(123);
GenericConstraint.GenericShow(people);
GenericConstraint.GenericShow(chinese);
GenericConstraint.GenericShow(hubei);
GenericConstraint.GenericShow(japanese);//
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.Read();
}
