using System; using System.Collections.Generic; using System.Linq; using System.Text; using N1; namespace Test { class Program { static void Main() { A oa = new A(); oa.Mysl(); } } } namespace N1 { class A { public void Mysl() { Console.WriteLine("okk"); Console.ReadLine(); } } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; class Program { class C { public int _Value = 0; } static void Main() { int v1 = 0; int v2 = v1; v2 = 789; C r1 = new C(); C r2 = r1; r2._Value = 112; //r1._Value = 110; Console.WriteLine("Values:{0},{1}",v1,v2); Console.WriteLine("Refs:{0},{1}",r1._Value,r2._Value); } }
应用类型的特征：（主要的对象类型数据）
1.必须在托管堆堆中为引用类型变量分配内存。
2.必须使用new关键字来创建引用类型的变量。
3.在托管堆中的每个对象都有与之相关联的附加成员，这些成员必须被初始化。
4.引用类型变量由垃圾回收机制来管理。
5.多个引用类型变量可以引用同一对象，这种情形下，对一个变量的操作会影响另一变量所引用的同一对象。
6.引用类型被赋值前的值都是NULL。
值类型与引用类型的区别：
1。值类型直接存储其值，而引用类型存储对其值得引用。
2.值类型是在栈中操作，而引用类型是在堆（托管堆）中分配存储单元。（值类型相当于现金，要用直接用。引用类型相当于存折，想用的要去取）
using System; using System.Collections.Generic; using System.Linq; using System.Text; class Program { static void Main() { int i = 2008; object obj = i;//object 所有类的基类，将值类型转换为引用类型的过程叫做装箱 Console.WriteLine("old:{0},{1}",i,obj); i = 5454; Console.WriteLine("new:{0},{1}",i,obj); Console.ReadLine(); } }
装箱和卸箱：拆箱时要注意，拆箱后得到的值类型数据的值与装箱对象相等，{要符合类型一致性原则，即不能将一个值为“String”的object类型转换为int类型}
using System; using System.Collections.Generic; using System.Linq; using System.Text; class Program { static void Main() { string strA = "用一生等待"; string strB = "永不放弃"; string newstr = String.Format("{0},{1}!!",strA,strB); Console.WriteLine(newstr); Console.ReadLine(); } }
上面是格式化字符串操作。
数组的合并和拆分：
using System; using System.Collections.Generic; using System.Linq; using System.Text; class Program { static void Main() { int[] arr1 = new int[] {1,2,3,4,5}; int[] arr2 = new int[] {6,7,8,9,10}; int len = arr1.Length + arr2.Length; int[] arr3 = new int[len]; for (int i = 0; i < arr3.Length; ++i) { if (i < arr1.Length) { arr3[i] = arr1[i]; } else { arr3[i] = arr2[i - arr1.Length]; } } Console.WriteLine("合并以后的一维数组："); foreach (int i in arr3) Console.Write("{0}",i + " "); Console.WriteLine(); int[,] arr4 = new int[2,5]; for (int i = 0; i < arr4.Rank; ++i) { switch (i) { case 0: { for (int j = 0; j < arr1.Length; ++j) { arr4[i, j] = arr1[j]; } break; } case 1: { for (int j = 0; j < arr2.Length; ++j) { arr4[i, j] = arr2[j]; } break; } } } Console.WriteLine("合并以后的二维数组为："); for (int i = 0; i < arr4.Rank; ++i) { for (int j = 0; j < arr4.GetUpperBound(arr4.Rank - 1) + 1; ++j) { Console.Write(arr4[i,j] + " "); } Console.WriteLine(); } } }
ArrayList类
using System; using System.Collections.Generic; using System.Linq; using System.Text; class Program { static void Main() { System.Collections.ArrayList list1 = new System.Collections.ArrayList(); list1.Add(3); list1.Add(105); foreach (int i in list1) { Console.Write(i + " "); } Console.WriteLine(); //Console.Write(list1);//不能这么写，list1是个数组 //Console.WriteLine(); System.Collections.ArrayList list2 = new System.Collections.ArrayList(); list2.Add("It is raining in Redmond."); list2.Add("It is snowing in the mountains."); foreach (string str in list2) { Console.WriteLine(str); } Console.WriteLine(); //Console.Write(list2); //Console.WriteLine(); } }
using System; using System.Collections.Generic; using System.Linq; using System.Text; public class GenericList<T> { private class Node { public Node(T t) { next = null; data = t; } private Node next; public Node Next { get { return next; } set { next = value; } } private T data; public T Data { get { return data; } set { data = value; } } } private Node head; public GenericList() { head = null; } public void AddHead(T t) { Node n = new Node(t); n.Next = head; head = n; } public IEnumerator<T> GetEnumerator() { Node current = head; while(current != null) { yield return current.Data; current = current.Next; } } } class Program { static void Main() { GenericList<int> list = new GenericList<int>(); for (int x = 0; x < 10; ++x) { list.AddHead(x); } foreach (int i in list) { System.Console.Write(i + " "); } System.Console.WriteLine("\nDone"); } }