获取一组词典中给定键的每个值的列表？

Question

我该如何更清晰/简洁地编写此代码？

/// <summary> 
    /// Creates a set of valid URIs. 
    /// </summary> 
    /// <param name="levelVariantURIDicts">A collection of dictionaries of the form: 
    ///          dict["filePath"] == theFilePath </param> 
    /// <returns></returns> 
    private ICollection<string> URIsOfDicts(ICollection<IDictionary<string, string>> levelVariantURIDicts) 
    { 
     ICollection<string> result = new HashSet<string>(); 
     foreach (IDictionary<string, string> dict in levelVariantURIDicts) 
     { 
      result.Add(dict["filePath"]); 
     } 
     return result; 
    } 

Answer 1

您可以Select选择dict["filePath"]为levelVariantURIDicts每个dict：

return levelVariantURIDicts.Select(dict => dict["filePath"]) 
          .Distinct() 
          .ToList(); 

下降.Distinct()如果结果重复条目都很好。
删除.ToList()如果您确实不需要返回ICollection <T>和IEnumerable <T>很好。