Question

我正在编写一个带有开箱即用的表单和数据集的快速实用程序应用程序。

require 'httparty'

class LolObserver
 include HTTParty
 default_timeout(1) #timeout after 1 second

 attr_reader :api_key, :playerid, :domain
 attr_accessor :region
 def initialize(region,playerid,apikey)
   @region = region_server(region)
   @playerid = playerid
   @api_key = apikey
 end

 def region_server(region)
   case region
   when "euw"
     @domain = "https://euw.api.pvp.net"
     self.region = "EUW1"
   when "na"
     @domain = "https://na.api.pvp.net"
     self.region = "NA1"
   end
 end

 def handle_timeouts
   begin
     yield
   #Timeout::Error, is raised if a chunk of the response cannot be read within the read_timeout.
   #Timeout::Error, is raised if a connection cannot be created within the open_timeout.
   rescue Net::OpenTimeout, Net::ReadTimeout
     #todo
   end
 end

 def base_path
   "/observer-mode/rest/consumer/getSpectatorGameInfo"
 end

 def current_game_info
   handle_timeouts do
     url = "#{domain}/#{ base_path }/#{region}/#{playerid}?api_key=#{api_key}"
     puts '------------------------------'
     puts url
     HTTParty.get(url,:debug_output => $stdout)
   end
 end

 end

查看该行是否已存在的查询是否具有哈希查找的性能，或者它最终会反复搜索整个集合？

DataRowCollection.Contains Method (Object)的文档没有说明。

Answer 1

您可以构建一个为任何列提供哈希的字典

            DataTable dt = new DataTable();

            Dictionary<string, List<DataRow>> dict = dt.AsEnumerable()
                .GroupBy(x => x.Field<string>("Col A"), y => y)
                .ToDictionary(x => x.Key, y => y.ToList());

如果每个键只有一个值，请使用此

            Dictionary<string, DataRow> dict = dt.AsEnumerable()
                .GroupBy(x => x.Field<string>("Col A"), y => y)
                .ToDictionary(x => x.Key, y => y.FirstOrDefault());

DataSet主键列是否已编入索引？

1 个答案: