1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 7 namespace wpfDistinct 8 { 9 class DataCompare : IEqualityComparer 10 {11 12 public bool Equals(DateTime x, DateTime y)13 {14 return x.Hour == y.Hour;15 }16 17 public int GetHashCode(DateTime obj)18 {19 return (obj.Year + obj.Month + obj.Day + obj.Hour).ToString().GetHashCode();20 21 }22 }23 } 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 using System.Windows; 7 using System.Windows.Controls; 8 using System.Windows.Data; 9 using System.Windows.Documents;10 using System.Windows.Input;11 using System.Windows.Media;12 using System.Windows.Media.Imaging;13 using System.Windows.Navigation;14 using System.Windows.Shapes;15 16 namespace wpfDistinct17 {18 /// 19 /// MainWindow.xaml 的交互逻辑20 /// 21 public partial class MainWindow : Window22 {23 public MainWindow()24 {25 InitializeComponent();26 27 Random rand = new Random();28 List list = new List ();29 for (int i = 0; i < 100; i++)30 {31 list.Add(new DateTime(2016, rand.Next(1, 12), rand.Next(1, 31), rand.Next(1, 12),rand.Next(1,59),rand.Next(1,59)));32 }33 if (null != list)34 {35 List list3 = list.Distinct(new DataCompare()).ToList();36 37 if (null != list3)38 {39 List > collcetion = new List >();40 foreach (DateTime time in list3)41 {42 collcetion.Add(list.Where(i => i.Month==time.Month&& i.Day == time.Day&&i.Hour==time.Hour).ToList());43 }44 }45 46 47 }48 49 }50 }51 }
Distinct 要实现IEqualityComparer 这个接口才能自定义 hashCode的精度到那个地方，就可以以那种精度进行去重