c#简单的通讯录

淡淡的烟草味﹌ 2024-04-19 13:22 73阅读 0赞

## （一）功能介绍 ##

1）实现添加联系人  
2）实现查找联系人  
3）实现修改联系人  
4）实现删除联系人  
5）实现退出功能

## （二）功能实现 ##

代码：

using System;
    using System.Collections;
    namespace MyClass
    {
        class Program
        {
             static void Main(string[] args)
             {
                try {
                    Console.WriteLine("");
                    while (true)
                    {
                        Console.WriteLine("通信录管理");
                        Console.WriteLine("\t1.新建联系人");
                        Console.WriteLine("\t2.查找联系人");
                        Console.WriteLine("\t3.修改联系人");
                        Console.WriteLine("\t4.删除联系人");
                        Console.WriteLine("\t5.退出");
                        Console.WriteLine();
                        string choose = Console.ReadLine().Trim();
                        switch (choose)
                        {
                            case "1":
                                AddItem();
                                break;
                            case "2":
                                SearchItem();
                                break;
                            case "3":
                                EditItem();
                                break;
                            case "4":
                                RemoveItem();
                                break;
                            case "5":
                                return;
                            default:
                                Console.WriteLine("选择错误！");
                                break;
                        }
    
                    }
                }
                catch (Exception e) {
                    Console.WriteLine(e.Message);
                }
             }
            private static Hashtable hashtable = new Hashtable();
    
            public static void AddItem() {
                try
                {
                    Console.Write("姓名：");
                    string name = Console.ReadLine().Trim();
                    if (!hashtable.ContainsKey(name))
                    {
                        Console.Write("电话号码：");
                        string number = Console.ReadLine().Trim();
                        hashtable[name] = number;
                    }
                    else {
                        Console.WriteLine("{0}已经存在！",name);
                    }
                }
                catch(Exception e) {
                    throw e;
                }
            }
    
            public static void EditItem() {
                try {
                    Console.Write("姓名：");
                    string name = Console.ReadLine().Trim();
                    if (hashtable.ContainsKey(name))
                    {
                        Console.Write("电话号码：");
                        string number = Console.ReadLine().Trim();
                        hashtable[name] = number;
                    }
                    else
                    {
                        Console.Write("{0}不存在！", name);
                    }
                }catch(Exception e)
                {
                    throw e;
                }
            }
    
            public static void SearchItem() {
                try {
                    Console.Write("\n姓名：");
                    string name = Console.ReadLine().Trim();
                    if (hashtable.ContainsKey(name))
                    {
                        Console.WriteLine("{0}电话号码是{1}", name, (string)hashtable[name]);
                    }
                    else
                    {
                        Console.WriteLine("{0}不存在！", name);
                    }
                }
                catch (Exception e)
                {
                    throw e;
                }
            }
    
            public static void RemoveItem() {
                try
                {
                    Console.Write("\n姓名：");
                    string name = Console.ReadLine().Trim();
                    if (hashtable.ContainsKey(name))
                    {
                        hashtable.Remove(name);
                        Console.WriteLine("{0}删除成功", name);
                    }
                    else
                    {
                        Console.WriteLine("{0}不存在！",name);
    
                    }
                }
                catch(Exception e) {
                    throw e;
                }
            }
        }
    }

注：  
异常处理单独抽取出一个方法，减少冗余代码