小编Pow*_*525的帖子

我仍然是超载运营商的新手.在我遇到这个问题之前,我以为自己做得很好.在!=运算符上抛出NullReferenceException.我假设它在CompareTo方法中使用它,但我不完全确定.如果有人能指出我正确的方向,我将非常感激.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            List<Task> tasks = new List<Task>();
            tasks.Add(new Task( "first",  DateTime.Now.AddHours(2)));
            tasks.Add(new Task( "second", DateTime.Now.AddHours(4)));
            tasks.TrimExcess();
            tasks.Sort();
        }
    }
    public class Task : IComparable
    {
        public Task()
        {
        }
        public Task(string nameIn, DateTime dueIn)
        {
            nameOfTask = nameIn;
            dateDue = dueIn;
        }
        DateTime dateDue;
        string nameOfTask;

        public static bool operator <(Task …