Distinct 实现自定义去重

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace wpfDistinct
 {
     class DataCompare : IEqualityComparer<DateTime>
     {

         public bool Equals(DateTime x, DateTime y)
         {
             return x.Hour == y.Hour;
         }

         public int GetHashCode(DateTime obj)
         {
             return (obj.Year + obj.Month + obj.Day + obj.Hour).ToString().GetHashCode();

         }
     }
 }

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;

 namespace wpfDistinct
 {
     /// <summary>
     /// MainWindow.xaml 的交互逻辑
     /// </summary>
     public partial class MainWindow : Window
     {
         public MainWindow()
         {
             InitializeComponent();

             Random rand = new Random();
             List<DateTime> list = new List<DateTime>();
             for (int i = ; i < ; i++)
             {
                 list.Add(new DateTime(, rand.Next(, ), rand.Next(, ), rand.Next(, ),rand.Next(,),rand.Next(,)));
             }
             if (null != list)
             {
                 List<DateTime> list3 = list.Distinct(new DataCompare()).ToList();

                 if (null != list3)
                 {
                     List<List<DateTime>> collcetion = new List<List<DateTime>>();
                     foreach (DateTime time in list3)
                     {
                         collcetion.Add(list.Where(i => i.Month==time.Month&& i.Day == time.Day&&i.Hour==time.Hour).ToList());
                     }
                 }

             }

         }
     }
 }

Distinct 要实现IEqualityComparer<DateTime> 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