// 为啥不直接用基类： 约束可以叠加，更灵活
// 此实现与 line 19 - line24效果一样
// 但是使用泛型约束可以不止局限在People
// 可以让它既是people 或 people 子类， 也可以同时
// 是ISports, IWork
public static void ShowBase(People peop)
{
Console.WriteLine($"{peop.Id}_ {peop.Name}");
peop.Hi();
}
static void Main(string[] args)
{
try
{
//var list = new List<int>() { 1, 2, 3, 4 }
//.Select(i => new
//{
// id = i,
// name = "Test" + i
//});
//foreach (var item in list)
//{
// Console.WriteLine(item.id);
// Console.WriteLine(item.name);
//}
//List<int>
Console.WriteLine("欢迎来到.net高级班vip课程，今天是Eleven老师给大家带来的泛型Generic");
int iValue = 123;
string sValue = "456";
DateTime dtValue = DateTime.Now;
object oValue = new object();
Console.WriteLine(typeof(List <int>));
Console.WriteLine(typeof(Dictionary <int, string>));
Console.WriteLine("**************************");
CommonMethod.ShowInt(iValue);
//CommonMethod.ShowInt(sValue);
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，由编译器推断出来
//GenericMethod.Show<int>(sValue);//类型参数和参数必须匹配
GenericMethod.Show <string>(sValue);
GenericMethod.Show <DateTime>(dtValue);
Console.WriteLine("**************************");
People people = new People()
{
Id = 11,
Name = "山冈"
};
Japanese japanese = new Japanese()
{
Id = 112,
Name = "鬼子"
};
Chinese chinese = new Chinese()
{
Id = 123,
Name = "口口"
};
Hubei hubei = new Hubei()
{
Id = 123,
Name = "pig猪"
};
//Constraint.Show<People>(people);
Constraint.Show <Chinese>(chinese);
Constraint.Show <Hubei>(hubei);
Constraint.ShowPeople(people);
Constraint.ShowPeople(chinese);
Constraint.ShowPeople(hubei);
//Constraint.ShowInterface<People>(people);//没有实现ISports接口
Constraint.ShowInterface <Chinese>(chinese);
Constraint.ShowInterface <Hubei>(hubei);
Constraint.ShowInterface <Japanese>(japanese);
//Constraint.Show<Japanese>(japanese);//虽然Japanese有ID和Name，但是因为不是People，所以不能调用
//Constraint.Show<int>(iValue);//约束后，只能按约束传递
#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(iValue);
}
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();
}
public static void ShowPeople(People PParameter)
{
Console.WriteLine("这里是Common，ShowInt，parameter={0}，parameter={1}", PParameter, PParameter.GetType());
}
/// <summary>
///
/// </summary>
/// <param name="people"></param>
public static void ShowBase(People people)
{
Console.WriteLine($"{people.Id}-{people.Name}");
}
static void Main(string[] args)
{
Console.WriteLine(".net framework 1.0的时候");
int intValue = 1;
string stringValue = "1";
DateTime dateValue = DateTime.Now;
CommonMethod.ShowInt(intValue);
CommonMethod.ShowString(stringValue);
CommonMethod.ShowDateTime(dateValue);
Console.WriteLine("使用object简化代码");
CommonMethod.ShowObj(intValue);
CommonMethod.ShowObj(stringValue);
CommonMethod.ShowObj(dateValue);
Console.WriteLine(".net framework 2.0的时候，引入泛型");
GenericMethod.Show(intValue);
GenericMethod.Show(stringValue);
GenericMethod.Show(dateValue);
Console.WriteLine("打印泛型类型，会看到编译器，生成占位符");
Console.WriteLine(typeof(List <>));
Console.WriteLine(typeof(Dictionary <,>));
Console.WriteLine("比较性能");
Monitor.Show();
// 泛型类
// 泛型接口
// 泛型约束
var people = new People()
{
Id = 1,
Name = "人类"
};
var chinese = new Chinese()
{
Id = 2,
Name = "中国人"
};
var japanese = new Japanese()
{
Id = 3,
Name = "日本人"
};
CommonMethod.ShowObj(people);
CommonMethod.ShowObj(chinese);
CommonMethod.ShowObj(japanese);
GenericMethod.Show(people);
GenericMethod.Show(chinese);
GenericMethod.Show(japanese);
// 上面方法只是打印了对象的类型
// 如果想打印 对象里的内容 输出Id,Name的值
Constraint.ShowBase(people);
Constraint.Show(chinese);
//Constraint.Show(japanese); 由于japannese 不是继承自 People 类所以这里不能使用
// 为啥不直接使用基类 方法
// 泛型类缓存
GenericCacheTest.Show();
}
public static void ShowBase(People tParameter)//Constraint can be overlap,
{
Console.WriteLine($"{tParameter.Id}_{tParameter.Name}");
tParameter.Hello();
}
static void Main(string[] args)
{
try
{
Console.WriteLine("欢迎来到.net高级班vip课程，今天是Eleven老师给大家带来的泛型Generic");
//List<int>
//List<string>
//Console.WriteLine(typeof(List<>));//`1
//Console.WriteLine(typeof(Dictionary<,>));//`2
//var varValue = 789;
//object objectValue = 789;
//int iValue = 123;
//dynamic dValue = 789;
////int result = varValue + iValue;
////int result2 = objectValue + iValue;
//int result3 = dValue + iValue;
//string sValue = "456";
//DateTime dtValue = DateTime.Now;
//object oValue = "MrSorry";
//Console.WriteLine("**************************");
//CommonMethod.ShowInt(iValue);
//CommonMethod.ShowString(sValue);
//CommonMethod.ShowDateTime(dtValue);
//CommonMethod.ShowObject(oValue);
//CommonMethod.ShowObject(iValue);
//CommonMethod.ShowObject(sValue);
//CommonMethod.ShowObject(dtValue);
//Console.WriteLine("************Generic**************");
//GenericMethod.Show<int>(iValue);//需要指定类型参数
////GenericMethod.Show<string>(iValue);//必须吻合
//GenericMethod.Show(iValue);//能省略，自动推算
//GenericMethod.Show<string>(sValue);
//GenericMethod.Show<DateTime>(dtValue);
//GenericMethod.Show<object>(oValue);
////GenericClass<int> genericClass = new GenericClass<int>()
////{
//// _T = 123
////};
////GenericClass<string> genericClassString = new GenericClass<string>()
////{
//// _T = "123"
////};
//Console.WriteLine("************Monitor**************");
//Monitor.Show();
////generic≈≈common>object
////泛型：又叫马儿跑，又叫马儿不吃草！ 因为框架的升级
GenericCacheTest.Show();
Console.WriteLine("************Constraint*****************");
{
People people = new People()
{
Id = 123,
Name = "走自己的路"
};
Chinese chinese = new Chinese()
{
Id = 234,
Name = "晴天"
};
Hubei hubei = new Hubei(123)
{
Id = 345,
Name = "流年"
};
Japanese japanese = new Japanese()
{
Id = 7654,
Name = "苍老师"//寒露的建议
};
//CommonMethod.ShowObject(people);
//CommonMethod.ShowObject(chinese);
//CommonMethod.ShowObject(hubei);
//CommonMethod.ShowObject(japanese);
//Constraint.Show<People>(people);
Constraint.Show <Chinese>(chinese);
//Constraint.Show<Hubei>(hubei);
//Constraint.Show<Japanese>(japanese);//
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Console.Read();
}