C# 数组查找与排序实现代码

Person p1 = new Person( " http://www.my400800.cn " , 18 );
Person p2 = new Person( " http://www.my400800.cn " , 19 );
Person p3 = new Person( " http://www.my400800.cn " , 20 );
Person[] persons = ... { p1, p2, p3 } ;
// 查找p2所在数组中的位置
Array.IndexOf < Person > (persons, p2);

Person p1 = new Person( " http://www.my400800.cn " , 18 );
Person p2 = new Person( " http://blog.my400800.cn " , 19 );
Person p3 = new Person( " http:// blog.my400800.cn/400电话 " , 20 );
Person[] persons = ... { p1, p2, p3 } ;
Person p4 = new Person(p2.Name, p2.Age);
// 查找数组中与p4相同的元素所在的位置
Array.IndexOf < Person > (persons, p4);

public override bool Equals( object obj)
... {
Person person = obj as Person;
if (person == null ) return false ;
return ( this .name == person.name && this .age == person.age);
}

public int CompareTo( object obj)
... {
Person person = obj as Person;
if (person == null )
throw new Exception( " The method or operation is not implemented. " );
// 先从年龄开始比较
int ageResult = this .age.CompareTo(person.age);
if (ageResult == 0 )
... {
// 如果年龄相等在坐姓名比较
return this .name.CompareTo(person.name);
}
else
... {
return ageResult;
}
}

// 得到 person 在 persons 中有相同值的下标
// 如果多个相同的值,BinarySearch将取最后
// 一个有相同值的数组下标
Array.BinarySearch < Person > (persons, person);

// 必需使比较的对象实现IComparable接口
Array.Sort < Person > (persons);