C# Dictionary根据key正序倒序排列的几种方法（亲测）

因在数据处理时候的不同数据类型下方便操作，所以我把几种方法都列出来。
【同一个命名空间下的不同方法调用：命名空间名.类名.方法名】

class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, string> dic = new Dictionary<string, string>();
            dic.Add("aname", "bjson");
            dic.Add("url", "http://www.bejson.com");
            dic.Add("address", "江苏苏州科技园路");
            dic.Add("country", "中国");

            #region 升序方法1
            //升序方法1：
            Dictionary<string, string> ascdic = dic.OrderBy(o => o.Key).ToDictionary(o => o.Key, p => p.Value.ToString());//对key进行升序
            //遍历元素
            foreach (KeyValuePair<string, string> kv in ascdic)
            {
                Console.WriteLine("方法一升序以后的key列表为：" + kv.Key + ", value为：" + kv.Value);
            }
            #endregion

            #region 升序方法2：直接使用SortedDictionary
            //升序方法2：直接使用SortedDictionary
            SortedDictionary<string, string> sorDic = new SortedDictionary<string, string>();
            sorDic.Add("street", "学院路");
            sorDic.Add("city", "上海");
            sorDic.Add("cab", "30");
            sorDic.Add("url", "http://www.google.com");
            //遍历元素
            foreach (KeyValuePair<string, string> kv in sorDic)
            {
                Console.WriteLine("方法2的升序以后顺序为key：" + kv.Key + ",  value为：" + kv.Value);
            }
            #endregion

            #region 升序方法3
            //升序排序方法2的简单版本
            SortedDictionary<string, string> sac = new SortedDictionary<string, string>(dic);
            foreach (KeyValuePair<string, string> kv in sorDic)
            {
                Console.WriteLine("方法2的另一个版本以后顺序为key：" + kv.Key + ",  value为：" + kv.Value);
            }
            #endregion

            #region 升序方法4
            //升序方法3
            ArrayList arrayList = new ArrayList();
            arrayList.AddRange(dic.Keys);
            arrayList.Sort();

            //遍历元素
            StringBuilder sbu = new StringBuilder();
            Dictionary<string, string> ascDic = new Dictionary<string, string>();
            foreach (string al in arrayList)//注意arrayList与al的数据类型是子集关系
            {
                sbu.Append(al).Append(dic[al]);//得到数据为key1value1key2value2
                ascDic.Add(al, dic[al]);

            }
            foreach (KeyValuePair<string, string> kv in ascDic)
            {
                Console.WriteLine("方法3的数据封装以后顺序为key：" + kv.Key + ",  value为：" + kv.Value);
            }
            Console.WriteLine("方法3升序以后的顺序为：" + sbu);

            #endregion

            //降序排列
            Console.WriteLine("---------------------降序排列结果如下：---------------------");

            #region 降序方法1
            //降序方法一：
            Dictionary<string, string> desDic = dic.OrderByDescending(o => o.Key).ToDictionary(o => o.Key, p => p.Value.ToString());
            foreach (KeyValuePair<string, string> kv in desDic)
            {
                Console.WriteLine("第一种降序方式运行结果key为：" + kv.Key + ", value为" + kv.Value);
            }
            #endregion

            #region 降序方法三
            //降序方法二：
            Dictionary<string, string> des2Dic = new Dictionary<string, string>();
            foreach (KeyValuePair<string, string> kv in sorDic.Reverse())//Reverse()方法为反转元素顺序
            {
                des2Dic.Add(kv.Key, kv.Value);
                Console.WriteLine("将SortedDictionary<string, string>升序以后的数据进行降序的key为：" + kv.Key + ", value为：" + kv.Value);
            }
            #endregion

            #region 降序方法三
            //降序方法三：
            arrayList.Reverse();
            StringBuilder sub = new StringBuilder();
            Dictionary<string, string> desrDic = new Dictionary<string, string>();
            foreach (string al in arrayList)//注意arrayList与al的数据类型是子集关系
            {
                sub.Append(al).Append(dic[al]);//得到数据为key1value1key2value2
                desrDic.Add(al, dic[al]);

            }
            foreach (KeyValuePair<string, string> kv in desrDic)
            {
                Console.WriteLine("方法3的ArrayList逆序以后顺序为key：" + kv.Key + ",  value为：" + kv.Value);
            }
            Console.WriteLine("方法3降序以后的顺序为：" + sub);

            #endregion


        }
    }

运行结果：