比较数组列表中的对象

Question

我有一个包含对象及其属性的数组列表。有没有办法比较对象的属性？

更新下面列表例如

listTA = {(ID, MonAry[], RequestDate), (ID, MonAry[], RequestDate)}; 

Answer 1

创建一个新的类中实现IComparer接口。那么你可以通过调用myList.Sort(new MyComparer());排序列表，你可以使用新的MyComparer().Compare(firstOne, secondOne);

样品每一个比较与其他一个：

using System; 
using System.Collections; 

public class SamplesArrayList { 

    public class myReverserClass : IComparer { 

     // Calls CaseInsensitiveComparer.Compare with the parameters reversed. 
     int IComparer.Compare(Object x, Object y) { 
      // you can implement this method as you wish! cast your x and y objects and access to their properties. 
      return((new CaseInsensitiveComparer()).Compare(y, x)); 
     } 

    } 

    public static void Main() { 

     // Creates and initializes a new ArrayList. 
     ArrayList myAL = new ArrayList(); 
     myAL.Add("The"); 
     myAL.Add("quick"); 
     myAL.Add("brown"); 
     myAL.Add("fox"); 
     myAL.Add("jumps"); 
     myAL.Add("over"); 
     myAL.Add("the"); 
     myAL.Add("lazy"); 
     myAL.Add("dog"); 

     // Displays the values of the ArrayList. 
     Console.WriteLine("The ArrayList initially contains the following values:"); 
     PrintIndexAndValues(myAL); 

     // Sorts the values of the ArrayList using the default comparer. 
     myAL.Sort(); 
     Console.WriteLine("After sorting with the default comparer:"); 
     PrintIndexAndValues(myAL); 

     // Sorts the values of the ArrayList using the reverse case-insensitive comparer. 
     IComparer myComparer = new myReverserClass(); 
     myAL.Sort(myComparer); 
     Console.WriteLine("After sorting with the reverse case-insensitive comparer:"); 
     PrintIndexAndValues(myAL); 

    } 

    public static void PrintIndexAndValues(IEnumerable myList) { 
     int i = 0; 
     foreach (Object obj in myList) 
     Console.WriteLine("\t[{0}]:\t{1}", i++, obj); 
     Console.WriteLine(); 
    } 

} 

另一IComparer的样本：

private class sortYearAscendingHelper : IComparer 
{ 
    int IComparer.Compare(object a, object b) 
    { 
     car c1=(car)a; 
     car c2=(car)b; 
     if (c1.year > c2.year) 
     return 1; 
     if (c1.year < c2.year) 
     return -1; 
     else 
     return 0; 
    } 
} 

Answer 2

检查SO后，

Arraylist can't compare objects after they are loaded from disk

检查教程的博客或者使用IComparable或IComparer2

http://www.codeproject.com/KB/recipes/Beginners_Sort.aspx#IComparablevsIComparer2

感谢