C#学习笔记- 浅谈数组复制,排序,取段,元组
using System; using System.Collections.Generic; namespace Application { class Test { static void Main () { //元组类型Tuple是静态类型，用静态方法创建实例，超过8个元素则第8个元素是元组类型 var tupe = Tuple.Create<int,int,string,string> (1, 2, "a", "b"); Console.WriteLine ("{ 0},{ 1}",tupe.Item1, tupe.Item3); //=====Array类是抽象类，只能通过它的静态方法CreateInstance()创建实例 //=====如果事先不知道类型，可以用此方法 Array arrays = Array.CreateInstance (typeof(int), 5); for (int i = 0; i < arrays.Length; i++) { arrays.SetValue (35, i); Console.WriteLine (arrays.GetValue (i)); } Person[] persons = { new Person { firstName = "su", lastName = "uifu" }, new Person { firstName = "chen", lastName = "xaohua" }, new Person { firstName = "cbb", lastName = "ruifu" }, new Person { firstName = "utt", lastName = "xiaohua" } } ; //=====Clone()复制数组，引用类型复制索引值，值类型复制值 Person[] persons1 = persons.Clone (); Array.Sort (persons, new PersonComparer (PersonCompareType.lastName)); foreach (var p in persons) { Console.WriteLine (p); } //＝＝＝＝＝＝ArraySegment<T>对数组取段＝＝＝＝ var segments = new ArraySegment<Person> (persons, 1, 2); for (int i = segments.Offset; i < segments.Offset + segments.Count; i++) { Console.WriteLine (segments.Array [i]); } } public class Person { public string firstName{ get; set; } public string lastName{ get; set; } public override string ToString () { return String.Format ("{ 0},{ 1}", firstName, lastName); } } //＝＝＝＝＝＝要对引用类型的数组使用Array.sort()方法，必须对类实现IComparable<T>接口 //＝＝＝＝＝＝或写一个附加类并实现Comparer<T>接口 public enum PersonCompareType { firstName, lastName } public class PersonComparer:IComparer<Person> { private PersonCompareType pct; public PersonComparer (PersonCompareType pct) { this.pct = pct; } public int Compare(Person x,Person y) { if (x == null) throw new ArgumentNullException (); if (y == null) throw new ArgumentNullException (); switch (pct) { case PersonCompareType.firstName: return x.firstName.CompareTo (y.lastName); case PersonCompareType.lastName: return x.lastName.CompareTo (y.lastName); default: throw new ArgumentException ("no.."); } } } }
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