C# Array.sort

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Array.sort 有3种方式：

待排序对象实现了IComparable<T> 接口

class Person :IComparable<Person>{        private String firstname;        public String Firstname        {            get { return firstname; }            set { firstname = value; }        }        private String lastname;        public String Lastname        {            get { return lastname; }            set { lastname = value; }        }        public Person(String f,String l)        {            this.firstname = f;            this.lastname = l;        }                public int CompareTo(Person other)        {            int result = this.Firstname.CompareTo(other.Firstname);            if (result.Equals(0))            {                result = this.Lastname.CompareTo(other.Lastname);            }            return result;        }    }

待排序对象你无法修改，将排序交给委托 Comparison<T> 去做

class util {         public static int comp(Person p1,Person p2){            return p1.Lastname.CompareTo(p2.Lastname);        }    }Person p1 = new Person("san", "zhang");            Person p2 = new Person("si", "li");            Person p3 = new Person("wu", "wang");            Person[] a = { p3,p1,p2};

Array.Sort<Person>(a, new Comparison<Person>(util.comp));

或者

Array.Sort<Person>(a, (Person x, Person y) => {                 int r = x.Firstname.CompareTo(y.Firstname);                if (r.Equals(0)) {                      r = x.Lastname.CompareTo(y.Lastname);                 }                return r;            });

待排序对象你无法修改，将排序交给实现了IComparer<T>接口的对象去做

class PersonComparer : IComparer<Person> {        public int Compare(Person x, Person y)        {            int result = x.Lastname.CompareTo(y.Lastname);            if (result.Equals(0))            {                result = x.Firstname.CompareTo(y.Firstname);            }            return result;        }    }Person p1 = new Person("san", "zhang");            Person p2 = new Person("si", "li");            Person p3 = new Person("wu", "wang");            Person[] a = { p3,p1,p2};            Array.Sort<Person>(a,new PersonComparer());