C#泛型ObservableCollection

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最新推荐文章于 2022-08-11 19:00:00 发布

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原文链接：http://www.cnblogs.com/ganquanfu2008/archive/2013/05/04/3059833.html

本文演示了如何使用C#中的ObservableCollection类及其NotifyCollectionChanged事件来监听集合变化。通过实例展示了当集合中的元素被替换时如何捕获并打印旧值和新值。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.ObjectModel;
 
 
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var b = new ObservableCollection<int>();
            b.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler(b_CollectionChanged);
 
            b.Add(100);
            b.Add(100);
            b.Add(100);
            b[0] = 200;;
            b[1] = 200;
            /*输出100
                  200
                  100
                  200*/
            Console.Read();
        }
 
        static void b_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
        {
            if (sender is ObservableCollection<int>)
            {
                ObservableCollection<int> t = sender as ObservableCollection<int>;
                if (e.Action==System.Collections.Specialized.NotifyCollectionChangedAction.Add)
                {
                    
                }
                else if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Remove)
                {
 
                }
                else if (e.Action==System.Collections.Specialized.NotifyCollectionChangedAction.Move)
                {
                    
                }
                else if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Replace)
                {
                    foreach (var item in e.OldItems)
                    {
                        Console.WriteLine(item.ToString()); ;
                        
                    }
                    foreach (var item in e.NewItems)
                    {
                        Console.WriteLine(item.ToString());
                        
                    }
 
                }
                else
                {
                    
                }
               
 
            }
        }
    }
    
 
}