.Net C#语法 构造函数中this和base
- public class TestClassA
- {
- public TestClassA()
- {
- Console.WriteLine("我是在TestClassA中的TestClassA()构造函数中");
- }
- public TestClassA(string a, string b)
- {
- Console.WriteLine("我是在TestClassA中的TestClassA(string a, string b)构造函数中");
- }
- public TestClassA(string a)
- : this(a, "b")
- {
- Console.WriteLine("我是在TestClassA中的TestClassA(string a): this(a, \"b\")构造函数中");
- }
- }
- public class TestClassB : TestClassA
- {
- public TestClassB()
- {
- Console.WriteLine("我是在TestClassB中的TestClassB()构造函数中");
- }
- public TestClassB(string a, string b)
- : base(a, b)
- {
- Console.WriteLine("我是在TestClassB中的TestClassB(string a, string b): base(a, b)构造函数中");
- }
- public TestClassB(string a)
- : this(a, "b")
- {
- Console.WriteLine("我是在TestClassB中的TestClassB(string a, string b): this(a, \"b\")构造函数中");
- }
- }
- Console.WriteLine("TestClassA Father1 = new TestClassA();运行结果:");
- TestClassA Father1 = new TestClassA();
- Console.WriteLine();
- Console.WriteLine("TestClassA Father2 = new TestClassA(\"f2\", \"f2\");运行结果:");
- TestClassA Father2 = new TestClassA("f2", "f2");
- Console.WriteLine();
- Console.WriteLine("TestClassA Father3 = new TestClassA(\"f3\");运行结果:");
- TestClassA Father3 = new TestClassA("f3");
- Console.WriteLine();
- Console.WriteLine("TestClassB Son1 = new TestClassB();运行结果:");
- TestClassB Son1 = new TestClassB();
- Console.WriteLine();
- Console.WriteLine("TestClassB Son2 = new TestClassB(\"s2\", \"s2\");运行结果:");
- TestClassB Son2 = new TestClassB("s2", "s2");
- Console.WriteLine();
- Console.WriteLine("TestClassB Son3 = new TestClassB(\"s3\");运行结果:");
- TestClassB Son3 = new TestClassB("s3");
- Console.WriteLine();
分析:
this:调用的是本身,不能调用父类和子类的
base:调用父类的,不能调用本身的,但别人继承,可以调用
从中也可以得出另外个结果构造函数的运行过程 先从基类开始构造再到类本身