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();
}
static void Main(string[] args)
{
try
{
{
Console.WriteLine("*****************Old Way***********");
int i = 123;
string s = "456";
DateTime dt = DateTime.Now;
object o = "sorry";
{
Console.WriteLine("************************");
CommonMethod.ShowInt(i);
CommonMethod.ShowString(s);
CommonMethod.ShowDateTime(dt);
CommonMethod.ShowObject(o);
CommonMethod.ShowObject(i);
CommonMethod.ShowObject(s);
}
{
Console.WriteLine("*************Generic**************");
GenericMethod.Show(i); // <> 能省略，自动推算
GenericMethod.Show <string>(s); //需要指定参数类型
}
{
Console.WriteLine("*************Monitor**************");
// 性能 common ~ Generic > object
Monitor.Show();
GenericCacheTest.Show();
}
{
Console.WriteLine("********************Constraint*************");
{
People people = new People()
{
Id = 123,
Name = "people"
};
Chinese chinese = new Chinese()
{
Id = 234,
Name = "Ivan"
};
Hubei hubei = new Hubei()
{
Id = 345,
Name = "Hubei"
};
Japanese japanese = new Japanese()
{
Id = 567,
Name = "Cang"
};
CommonMethod.ShowObject(people);
CommonMethod.ShowObject(chinese);
CommonMethod.ShowObject(hubei);
CommonMethod.ShowObject(japanese);
GenericMethod.Show <People>(people);
GenericMethod.Show <Chinese>(chinese);
GenericMethod.Show <Hubei>(hubei);
GenericMethod.Show <Japanese>(japanese);
{
Constraint.Show <People>(people);
Constraint.Show <Chinese>(chinese);
Constraint.Show <Hubei>(hubei);
// Constraint.Show<Japanese>(japanese); Error because Japanese not a child class of People
}
}
{
}
}
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Console.Read();
}
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();
}
