c#有序列表

SortedList<TKey, TValue>

运用Add()方法添加键与值

如果尝试访问的键不存在会抛出异常，为避免可以用ContainsKey()或TryGetValue()

ContainsKey():如果所传递的值存在会返回true

TryGetValue()：如果指定键对应的值不存在，尝试获得指定键的值

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace 有序列表
{
    class Program
    {
        static void Main(string[] args)
        {
            var books = new SortedList<string, string>();
            
            books.Add("Key1", "Value1");
            books.Add("Key2", "Value2");
            books["Key3"] = "Value3";
            books["Key4"] = "Value4";
            foreach (KeyValuePair<string,string> book in books)
            {
                Console.WriteLine($"{book.Key} {book.Value}");
            }
            //foreach (string isbn in books.Values)
            //{
            //    Console.WriteLine(isbn);
            //}
            //foreach (string title in books.Keys)
            //{
            //    Console.WriteLine(title);
            //}
            string title = "Key5";
            if(!books.TryGetValue(title,out string isbn))
            {
                Console.WriteLine($"{title} not found");
            }
            if (!books.ContainsKey(title))
            {
                Console.WriteLine($"{title} not found");
            }
        }
    }
}