Dictionary的排序查找等一些操作

Dictionary<int, string> dic = new Dictionary<int, string>（）；

    dic.Add（1, "HaHa"）；

    dic.Add（5, "HoHo"）；

    dic.Add（3, "HeHe"）；

    dic.Add（2, "HiHi"）；

    dic.Add（4, "HuHu"）；

    var result = from pair in dic orderby pair.Key select pair;

    foreach （KeyValuePair<int, string> pair in result）
 {

    Console.WriteLine（"Key:{0}, Value:{1}", pair.Key, pair.Value）；

    }

     // 根据最大Vlue和最小value取对应的Key
        private void button1_Click(object sender, EventArgs e)
        {
            List<string> list = new List<string>();
            Dictionary<string, string> dic = new Dictionary<string, string>();
            dic.Add("[1]", "02:01:11");
            dic.Add("[2]", "03:01:11");
            dic.Add("[3]", "01:01:13");
            list.Add("02:01:11");
            list.Add("03:01:11");
            list.Add("01:01:13");
            list.Sort();          

            string minKey= GetKey(dic,list[0]);
            string maxKey = GetKey(dic, list[list.Count-1]);
            MessageBox.Show("min:" + minKey + list[0] + System.Environment.NewLine + "max:" + maxKey + list[list.Count - 1]); 
        }

        // 根据Value取Key值
        private string GetKey(Dictionary<string,string> dic, string value)
        {
            string str="";
            var key = from d in dic
                      where d.Value == value
                      select d.Key;
            foreach (var k in key)
            {
                str = str + k +",";
            }
            return str.TrimEnd(',');

            //如果没有重复项可直接查找
            var str2 = dic.SingleOrDefault(k => k.Value == value);

            // Dictionary排序
            var result = dic.OrderByDescending((s) => s.Value);
            var result2 = dic.OrderByDescending((s) => s.Key);

        }

// 应用实例

        private void button1_Click(object sender, EventArgs e)
        {
            
            List<person> per = new List<person>
            {
                new person{ Name="AB", Age=30},
                new person{ Name="AA", Age=12},
                new person{ Name="AA", Age=13}
            };
            var result = per.Where(p => p.Name == "AB")
                .OrderByDescending(p => p.Age)
                .Take(2); //从序列的开头返回指定数量的连续元素。
            foreach (var r in result)
            {
                MessageBox.Show(r.Age.ToString());
            }
        }
        public class person
        {
            public string Name
            {
                get;
                set;
            }
            public int Age
            {
                get;
                set;
            }
        }