将字典转换为列表集合在C＃ [英] Convert dictionary to list collection in C#

问题描述

示例如果我有字典与模板字符串作为键和字符串作为值。然后我希望将字典键转换为列表集合作为字符串。

 字典< string，string> dicNumber = new Dictionary< string，string>（）; 
列表< string> listNumber = new List< string>（）; 
 
 dicNumber.Add（1，First）; 
 dicNumber.Add（2，Second）; 
 dicNumber.Add（3，Third）; 
 
 //所以代码可能看起来像这样
 // listNumber = dicNumber.Select（??????）; 
  

解决方案

将密钥转换为自己的列表：

  listNumber = dicNumber.Select（kvp => kvp.Key）.ToList（）; 
  

或者您可以缩短，甚至不用使用选择：

  listNumber = dicNumber.Keys.ToList（）; 
  

I have problem when trying to convert dictionary to list.

Example if I have dictionary with template string as key and string as value. Then i wish to convert dictionary key to list collection as string.

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

dicNumber.Add("1", "First");
dicNumber.Add("2", "Second");
dicNumber.Add("3", "Third");

// So the code may something look like this
//listNumber = dicNumber.Select(??????);

解决方案

To convert the Keys to a List of their own:

listNumber = dicNumber.Select(kvp => kvp.Key).ToList();

Or you can shorten it up and not even bother using select:

listNumber = dicNumber.Keys.ToList();

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