Dictionary排序
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));
- }
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 { }
- }
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();
- }
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 { }
- }
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();
- }
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
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