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c# Dictionary的遍历和排序
c#遍历的两种方式 for和foreach
for: 需要指定首位数据、末尾数据、数据长度; for遍历语句中可以改变数据的值; 遍历规则可以自定义,灵活性较高
foreach: 需要实现ienumerator接口; 在遍历中不可以改变数据的值; 遍历规则只能是‘++‘ ; 但查询效率较高
Dictionary遍历方式:
Dictionary<string, int> list = new Dictionary<string, int>();list.Add("d", 1);//3.0以上版本foreach (var item in list){ Console.WriteLine(item.Key + item.Value);}//KeyValuePair<T,K>foreach (KeyValuePair<string, int> kv in list){ Console.WriteLine(kv.Key + kv.Value);}//通过键的集合取foreach (string key in list.Keys){ Console.WriteLine(key + list[key]);}//直接取值foreach (int val in list.Values){ Console.WriteLine(val);}//非要采用for的方法也可List<string> test = new List<string>(list.Keys);for (int i = 0; i < list.Count; i++){ Console.WriteLine(test[i] + list[test[i]]);}
List排序:
Hashtable ht=new Hashtable(); ht.Add("E","e"); ht.Add("A","a"); ht.Add("C","c"); ht.Add("B","b"); ArrayList lst=new ArrayList(ht.Keys); lst.Sort(); foreach(string key in lst) { listBox1.Items.Add("key:" + key + " vlaue:"+ht[key]); }
Dictionary排序
排序思路:
1>用一个List保存Dictionary的数据
2>对新的List进行排序
3>从List获取排序好的值,重新添加进Dictionary
protected Dictionary<string, int> SortDictionary_Desc(Dictionary<string, int> dic) { List<KeyValuePair<string, int>> myList = new List<KeyValuePair<string, int>>(dic); myList.Sort(delegate(KeyValuePair<string, int> s1, KeyValuePair<string, int> s2) { return s2.Value.CompareTo(s1.Value); }); dic.Clear(); foreach (KeyValuePair<string, int> pair in myList) { dic.Add(pair.Key, pair.Value); } return dic; } protected Dictionary<string, int> SortDictionary_Asc(Dictionary<string, int> dic) { List<KeyValuePair<string, int>> myList = new List<KeyValuePair<string, int>>(dic); myList.Sort(delegate(KeyValuePair<string, int> s1, KeyValuePair<string, int> s2) { return s1.Value.CompareTo(s2.Value); }); dic.Clear(); foreach (KeyValuePair<string, int> pair in myList) { dic.Add(pair.Key, pair.Value); } return dic; }
c# Dictionary的遍历和排序
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