现有一个对象数组，如何按照不同字段对其排序？

[xinghuan123432]

public class Student
{
public int _ID;

public int ID
{
get { return _ID; }
set { _ID = value; }
}
private string _name;

public string Name
{
get { return _name; }
set { _name = value; }
}
}

Student[] stu=new Student[5];

Student s1 = new Student();
s1.ID = 1;
s1.Name = "张三";
stu[1] = s1;

Student s2 = new Student();
s2.ID = 2;
s2.Name = "李四";
stu[2] = s2;

Student s3 = new Student();
s3.ID = 3;
s3.Name = "王五";
stu[3] = s3;

Student s4 = new Student();
s4.ID = 4;
s4.Name = "阿二";
stu[4] = s4;

Array.Sort???

[zhujiazhi]

public class Student : IComparable
{
#region IComparable 成员

public int CompareTo(object obj)
{
throw new NotImplementedException();
}

#endregion
}

[机器人]

为什么不用Linq？

stu = stu.OrderBy(s => s.Name);
stu = stu.OrderBy(s => s.ID);

[huangwenquan123]

用list<>添加
list.Sort(new CompareStudent());排序，
List<Student> list = new List<Student>();
   public class CompareStudent : IComparer<Student>
    {
        public int Compare(Student x, Student y)
        {
            return y.ID - x.ID;
        }
    }
或者写个委托，传递方法。

[ciznx]

[Quote=引用 2 楼 fangxinggood 的回复:]
为什么不用Linq？
stu = stu.OrderBy(s => s.Name);
stu = stu.OrderBy(s => s.ID);
[/Quote]

显然这用的不是 .net 的高版本，不用建议用 Linq


另外，实现 IComparable 接口也不能解决问题，楼主希望按不同字段进行排序，换言之，想按哪个字段就按哪个字段，而不是像 IComparable 中那样只能按一两个既字字段排序


最方便的解决办法就是构建一个泛型 List，然后调用其 Sort 方法：

    List<Student> students = new List<Student>();


    public List<Student> SortById(List<Student> sts)
    {
        return sts.Sort(delegate(Student s1, Student s2){
                return s1.ID > S2.ID;
            });
    }

    //SortByName 的实现自己依此类推

[flyerwing]

[Quote=引用 2 楼 fangxinggood 的回复:]
为什么不用Linq？

stu = stu.OrderBy(s => s.Name);
stu = stu.OrderBy(s => s.ID);
[/Quote]
LINQ好用，大家好才是真的好。

[ciznx]

抱歉，上一楼中 delegate 委托应该返回的是 int 型，应该将 return s1.ID > S2.ID; 改为 return s1.ID - s2.ID;

[q107770540]

void Main()
{
	  
Student[] stu=new Student[4];

  Student s1 = new Student();
  s1.ID = 1;
  s1.Name = "张三";
  stu[0] = s1;

  Student s2 = new Student();
  s2.ID = 2;
  s2.Name = "李四";
  stu[1] = s2;

  Student s3 = new Student();
  s3.ID = 4;
  s3.Name = "王五";
  stu[2] = s3;

  Student s4 = new Student();
  s4.ID = 3;
  s4.Name = "阿二";
  stu[3] = s4;
  //order by  1 protety
  stu=stu.OrderBy(s=>s.ID).ToArray();
  
  //order by 2 potety
  stu=(from s in stu
      orderby s.ID,s.Name descending
	  select s).ToArray();
  
  
}
public class Student
  {
  public int _ID;

  public int ID
  {
  get { return _ID; }
  set { _ID = value; }
  }
  private string _name;

  public string Name
  {
  get { return _name; }
  set { _name = value; }
  }
  }