Dictionary字典排序

对一个Dictionary<TKey, TValue>进行排序可以用LINQ：

Dictionary
     
       MyDictionary = new Dictionary
      
       ();
      
     

1、键排序

MyDictionary = (from entry in MyDictionary                                      orderby entry.Key ascending                                     select entry).ToDictionary(pair => pair.Key, pair => pair.Value);

 

2、值排序

MyDictionary = (from entry in MyDictionary                                      orderby entry.Value ascending                                     select entry).ToDictionary(pair => pair.Key, pair => pair.Value);

 

Dictionary字典替换键的值

var dict = new Dictionary
     
      ();    dict.Add("abc","1");        dict.Add("abcd","2");       dict.Add("abcf","3");        //将键值为"abc"的键改为"abce"    dict = dict.ToDictionary(k => k.Key == "abc" ? "abce" : k.Key, k => k.Value);
     

 

Dictionary字典修改部分键

var dict = new Dictionary
     
      ();    dict.Add(1,"1");        dict.Add(2,"2");       dict.Add(3,"3");        //将键值大于1的键增加1    dict = dict.ToDictionary(k => k.Key > 1? k.Key +1 : k.Key, k => k.Value);
     

 

 

// 有相同的键则覆盖，没有则新增键和值

ConcurrentDictionary<string, int> dictionary = new ConcurrentDictionary<string, int>();

dictionary.AddOrUpdate(key, value, (oldkey, oldvalue) => value);