有时候由于某些要求会对Dictionary排序，一般有两种方法。

1、使用SortedDictionary。

这种自动会对保存的值进行排序。

 static void Main(string[] args)
 {
      SortedDictionary<int, object> testDictioary = new SortedDictionary<int, object>();
            int flag = 0;

            do
            {
                Random random = new Random();

                int temp = random.Next(100);

                if (!testDictioary.ContainsKey(temp))
                {
                    testDictioary.Add(temp, null);
                }

                flag = testDictioary.Count;

            } while (flag < 20);

            Console.WriteLine("未排序前:");

            foreach (int key in testDictioary.Keys)
            {
                Console.Write(string.Format(@"{0}  ", key));
            }
}

结果：

2、自己写的方法。如下

 public static void Sort(Dictionary<int, object> dictionary)
        {
            try
            {
                List<int> sortList = new List<int>();

                Dictionary<int, object> tempDictionary = new Dictionary<int, object>();

                foreach (int key in dictionary.Keys)
                {
                    sortList.Add(key);

                    tempDictionary.Add(key, dictionary[key]);
                }

                int flag = 1;

                int i, j;

                int itemCount = sortList.Count;

                int itemTemp;

                for (i = 1; i < itemCount && flag == 1; i++)
                {
                    flag = 0;

                    for (j = 0; j < itemCount - i; j++)
                    {
                        int countfore = sortList[j];

                        int countback = sortList[j + 1];

                        if (countfore > countback)
                        {
                            flag = 1;

                            itemTemp = sortList[j];

                            sortList[j] = sortList[j + 1];

                            sortList[j + 1] = itemTemp;
                        }
                    }
                }
                dictionary.Clear();

                for (int n = 0; n < itemCount; n++)
                {
                    foreach (int tempKey in tempDictionary.Keys)
                    {
                        int value = sortList[n];

                        if (tempKey.Equals(value))
                        {
                            if (!dictionary.ContainsKey(tempKey))
                            {
                                dictionary.Add(tempKey, tempDictionary[tempKey]);
                            }
                        }
                    }
                }
            }
            catch { }
        }

调用结果如下：

   static void Main(string[] args)
        {
            Console.WriteLine("key为数字");

            Dictionary<int, object> testDictioary = new Dictionary<int, object>();

            int flag = 0;

            do
            {
                Random random = new Random();

                int temp = random.Next(100);

                if (!testDictioary.ContainsKey(temp))
                {
                    testDictioary.Add(temp, null);
                }

                flag = testDictioary.Count;

            } while (flag < 20);

            Console.WriteLine("未排序前:");

            foreach (int key in testDictioary.Keys)
            {
                Console.Write(string.Format(@"{0}  ", key));
            }

            Console.WriteLine();

            CustomMethod.Sort(testDictioary);

            Console.WriteLine("排序后:");

            foreach (int key in testDictioary.Keys)
            {
                Console.Write(string.Format(@"{0}  ", key));
            }

            Console.ReadLine();

        }

那么这种方法是否是多此一举呢，因为SortedDictionary完全可以满足排序了。但是有时key会是这样的，100+“ssdd”，或100+20，是字符串类型。这样就能用到上面的方法了。比如以key为100+20这种类型为例。改动一下Sort方法。

   public static void Sort(Dictionary<string, object> dictionary)
        {
            try
            {
                List<int> sortList = new List<int>();

                Dictionary<string, object> tempDictionary = new Dictionary<string, object>();

                foreach (string key in dictionary.Keys)
                {
                    int intKey = Convert.ToInt32(key.Substring(0, key.IndexOf("+")));

                    sortList.Add(intKey);

                    tempDictionary.Add(key, dictionary[key]);
                }

                int flag = 1;

                int i, j;

                int itemCount = sortList.Count;

                int itemTemp;

                for (i = 1; i < itemCount && flag == 1; i++)
                {
                    flag = 0;

                    for (j = 0; j < itemCount - i; j++)
                    {
                        int countfore = sortList[j];

                        int countback = sortList[j + 1];

                        if (countfore > countback)
                        {
                            flag = 1;

                            itemTemp = sortList[j];

                            sortList[j] = sortList[j + 1];

                            sortList[j + 1] = itemTemp;
                        }
                    }
                }
                dictionary.Clear();

                for (int n = 0; n < itemCount; n++)
                {
                    foreach (string tempKey in tempDictionary.Keys)
                    {
                        string value = sortList[n].ToString();

                        if (tempKey.StartsWith(string.Format(@"{0}+", value)))
                        {
                            if (!dictionary.ContainsKey(tempKey))
                            {
                                dictionary.Add(tempKey, tempDictionary[tempKey]);
                            }
                        }
                    }
                }
            }
            catch { }
        }

调用：

         static void Main(string[] args)
        {
            Console.WriteLine("key为字符串");

            Dictionary<string, object> testDictioary = new Dictionary<string, object>();

            int flag = 0;

            do
            {
                Random random = new Random();

                int temp = random.Next(100);

                int tempValue = random.Next(100);

                string keyString = string.Format(@"{0}+{1}", temp, tempValue);

                if (!testDictioary.ContainsKey(keyString))
                {
                    testDictioary.Add(keyString, null);
                }

                flag = testDictioary.Count;

            } while (flag < 20);

            Console.WriteLine("未排序前:");

            foreach (string key in testDictioary.Keys)
            {
                Console.Write(string.Format(@"{0}  ", key));
            }

            Console.WriteLine();

            CustomOtherSort.Sort(testDictioary);

            Console.WriteLine("排序后:");

            foreach (string key in testDictioary.Keys)
            {
                Console.Write(string.Format(@"{0}  ", key));
            }

            Console.ReadLine();

        }

结果：

       

        详细工程：http://download.csdn.net/detail/yysyangyangyangshan/4114133