Dictionary CovertTo List

假设有如下一个Dictionary 要转换成List 

Dictionary<string, string> dicNumber = new Dictionary<string, string>();
    List<string> listNumber = new List<string>();

    dicNumber.Add("a", "First");
    dicNumber.Add("b", "Second");
    dicNumber.Add("c", "Third");

有如下几种方法：

Enumerable.Select<TSource, TResult> 方法 (IEnumerable<TSource>, Func<TSource,TResult>)

将序列中的每个元素投影到新表中。 （由 Enumerable 定义。）

1.listNumber=dicNumber.Select(kvp=>kvp.Key).ToList()
    上面代码中：kvp=>kvp.Key 将Dictionary中的每个元素投影到新表中,Func并返回TResult，然后把结果转成List

Dictionary.Keys 获取包含 Dictionary<TKey, TValue> 中的键的集合

2.listNumber=dicNumber.Keys.ToList();

    3.foreach(var item in dicNumber)

{
       listNumber.Add(item.key);
   }

    4.var keys=new List<string>(dicNumber.Keys);

.csharpcode, .csharpcode pre
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.csharpcode .alt
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.csharpcode .lnum { color: #606060; }

Dictionary CovertTo List