C#学习笔记- 浅谈数组复制,排序,取段,元组

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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