diff --git a/C#进阶/C#进阶.sln b/C#进阶/C#进阶.sln index 057b2ec..45feda1 100644 --- a/C#进阶/C#进阶.sln +++ b/C#进阶/C#进阶.sln @@ -21,6 +21,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson4_Hashtable", "Lesson EndProject Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson4_Hashtable练习题", "Lesson4_Hashtable练习题\Lesson4_Hashtable练习题.csproj", "{962C9536-7CD7-4F5A-9D1E-1DCF986953D4}" EndProject +Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson5_泛型", "Lesson5_泛型\Lesson5_泛型.csproj", "{8ECE6977-E08D-4089-9053-DFFD9864AB81}" +EndProject +Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson5_泛型练习", "Lesson5_泛型练习\Lesson5_泛型练习.csproj", "{524E1BC4-FE9A-4186-B7EE-A04323E98696}" +EndProject Global GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug|Any CPU = Debug|Any CPU @@ -63,6 +67,14 @@ Global {962C9536-7CD7-4F5A-9D1E-1DCF986953D4}.Debug|Any CPU.Build.0 = Debug|Any CPU {962C9536-7CD7-4F5A-9D1E-1DCF986953D4}.Release|Any CPU.ActiveCfg = Release|Any CPU {962C9536-7CD7-4F5A-9D1E-1DCF986953D4}.Release|Any CPU.Build.0 = Release|Any CPU + {8ECE6977-E08D-4089-9053-DFFD9864AB81}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {8ECE6977-E08D-4089-9053-DFFD9864AB81}.Debug|Any CPU.Build.0 = Debug|Any CPU + {8ECE6977-E08D-4089-9053-DFFD9864AB81}.Release|Any CPU.ActiveCfg = Release|Any CPU + {8ECE6977-E08D-4089-9053-DFFD9864AB81}.Release|Any CPU.Build.0 = Release|Any CPU + {524E1BC4-FE9A-4186-B7EE-A04323E98696}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {524E1BC4-FE9A-4186-B7EE-A04323E98696}.Debug|Any CPU.Build.0 = Debug|Any CPU + {524E1BC4-FE9A-4186-B7EE-A04323E98696}.Release|Any CPU.ActiveCfg = Release|Any CPU + {524E1BC4-FE9A-4186-B7EE-A04323E98696}.Release|Any CPU.Build.0 = Release|Any CPU EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE diff --git a/C#进阶/Lesson5_泛型/Lesson5_泛型.csproj b/C#进阶/Lesson5_泛型/Lesson5_泛型.csproj new file mode 100644 index 0000000..2150e37 --- /dev/null +++ b/C#进阶/Lesson5_泛型/Lesson5_泛型.csproj @@ -0,0 +1,10 @@ + + + + Exe + net8.0 + enable + enable + + + diff --git a/C#进阶/Lesson5_泛型/Program.cs b/C#进阶/Lesson5_泛型/Program.cs new file mode 100644 index 0000000..e0d530f --- /dev/null +++ b/C#进阶/Lesson5_泛型/Program.cs @@ -0,0 +1,136 @@ +using System.Runtime.InteropServices; +using static System.Net.Mime.MediaTypeNames; + +namespace Lesson5_泛型 +{ + #region 知识点一 泛型是什么 + //泛型实现了类型参数化，达到了代码重用的目的 + //通过类型参数化来实现同一份代码上操作多种类型 + + //泛型相当于类型占位符 + //定义类或方法时使用替代符代表变量类型 + //当真正使用类或方法时再具体指定类型 + #endregion + + #region 知识点二 泛型分类 + //泛型类和泛型接口 + //基本语法： + //class 类名<泛型占位符> + //interface 接口名<泛型占位符> + + //泛型占位语法 + //基本语法：函数名<泛型占位符>(参数列表) + + //注意：泛型占位符可以有多个，用逗号分开 + #endregion + + #region 知识点三 泛型类和接口 + class Test + { + public T value; + } + + class Test2 + { + public T1 value1; + public T2 value2; + public K value3; + public M value4; + public L value5; + } + + interface TestInterface + { + T value + { + get + { + return value; + } + set + { + this.value = value; + } + } + } + + class Test4 : TestInterface + { + //接口实现 + } + #endregion + + #region 知识点四 泛型方法 + class Test5 + { + public void TestFun(T value) + { + Console.WriteLine(value); + } + public void TestFun() + { + //用泛型类型做逻辑处理 + T t = default(T);// + } + + public T TestFun(string v) + { + return default(T); + } + + public void TestFun(T t,K k,M m) + { + + } + } + class Test5//泛型类和普通类即使只是多加一个泛型也是两个类 + { + public T value; + + //下面这个不是泛型方法，因为T是泛型类声明时指定的 + //我们就不能再手动指定类型了 + public void TestFun(T t) + { + + } + public void TestFun(K k) + { + + } + } + #endregion + + #region 知识点五 泛型的作用 + //1.不同类型的对象的相同逻辑处理可以用泛型 + //2.使用泛型可以一定程度上避免装箱拆箱 + //举例：优化ArrayList + class ArrayList + { + private T[] array;//实现它的增删查改 + } + #endregion + + + + internal class Program + { + static void Main(string[] args) + { + Test t1 = new Test(); + t1.value = 10; + Console.WriteLine(t1.value); + + Test t2 = new Test(); + t2.value = "test"; + Console.WriteLine(t2.value); + + Test5 t3 = new Test5(); + t3.TestFun("123"); + + Test5 t4 = new Test5(); + //t4.TestFun<("123");//不能是string了因为声明时是int + t4.TestFun("123"); + t4.TestFun(1.23f); + } + } +} diff --git a/C#进阶/Lesson5_泛型练习/Lesson5_泛型练习.csproj b/C#进阶/Lesson5_泛型练习/Lesson5_泛型练习.csproj new file mode 100644 index 0000000..2150e37 --- /dev/null +++ b/C#进阶/Lesson5_泛型练习/Lesson5_泛型练习.csproj @@ -0,0 +1,10 @@ + + + + Exe + net8.0 + enable + enable + + + diff --git a/C#进阶/Lesson5_泛型练习/Program.cs b/C#进阶/Lesson5_泛型练习/Program.cs new file mode 100644 index 0000000..e566422 --- /dev/null +++ b/C#进阶/Lesson5_泛型练习/Program.cs @@ -0,0 +1,33 @@ +namespace Lesson5_泛型练习 +{ + internal class Program + { + static void Main(string[] args) + { + Console.WriteLine("Hello, World!"); + Console.WriteLine(InputType()); + Console.WriteLine(InputType()); + Console.WriteLine(InputType()); + Console.WriteLine(InputType()); + Console.WriteLine(InputType()); + + } + public static string InputType() + { + if (typeof(T) == typeof(int)) + { + return string.Format("{0},{1}字节", "整形", sizeof(int)); + }else if (typeof(T) == typeof(float)) + { + return string.Format("{0},{1}字节", "单精度浮点数", sizeof(float)); + }else if (typeof(T) == typeof(double)) + { + return string.Format("{0},{1}字节", "双精度浮点数", sizeof(double)); + }else if (typeof(T) == typeof(string)) + { + return string.Format("{0},{1}字节", "字符串", "不定长"); + } + return "其他类型"; + } + } +}