Question

我的文本文件包含以下格式的机场代码：

"AAA","","Anaa Arpt","PF","","","AAA","2","N","272"

我使用StreamReader来读取文件中的行，然后我将该行添加到字符串列表中，最后将该列表转换为IEnumerable类型。

你能帮我解决一下，我怎样才能从每一行得到三个值，例如

AAA是airportCode
Anna Arpt机场名称
PF是国家/地区代码

我想从每一行只获得这三个值。

请在下面找到代码。

using (StreamReader sr = new StreamReader("C:/AirCodes/RAPT.TXT"))
{
    String line;

    while ((line = sr.ReadLine()) != null)
    {
        aircodesFromTravelPort.Add(line);
        Console.WriteLine(line);
    }
}
var codes = (IEnumerable<String>)aircodesFromTravelPort;
foreach (var aircode in codes)

Answer 1

您似乎可以尝试使用 Linq ，类似的东西：

  var codes = File
    .ReadLines(@"C:/AirCodes/RAPT.TXT")
    .Select(line => line.Split(','))
    .Select(items => new {
       // I've created a simple anonymous class, 
       // you'd probably want to create you own one
       Code = items[0].Trim('"'),    //TODO: Check numbers
       Airport = items[2].Trim('"'),
       Country = items[3].Trim('"')
    })
    .ToList();

  ...

  foreach(var item in codes) 
    Console.WriteLine(item);

Answer 2

您可能希望在每一行上使用String的Split函数将值放入数组中。

while ((line = sr.ReadLine()) != null)
{
  var values = line.Split(","); // here you have an array of strings containing the values between commas

  var airportCode = values[0];
  var airportName = values[2];
  var airportCountry = values[3]; 
  var airportInfo = airportCode + "," + airportName + "," + airportCountry;
  aircodesFromTravelPort.Add(airportInfo );
  // what you actually do with the values is up to you, I just tried to make it as close to the original as possible.

  Console.WriteLine(airportInfo);
}

希望这有帮助！

Answer 3

我喜欢带有命名群组的Regex：

var line = @"""AAA"","""",""Anaa Arpt"",""PF"","""","""",""AAA"",""2"",""N"",""272""";
var pattern = @"^""(?<airportCode>\w+)"",""(\w*)"",""(?<ariportName>[\w\s]+)"",""(?<cuntryCode>\w+)""";
Match match = Regex.Match(line, pattern, RegexOptions.IgnoreCase);
if (match.Success)
{
    string airportCode = match.Groups["airportCode"].Value;
    string ariportName = match.Groups["ariportName"].Value;
    string cuntryCode = match.Groups["cuntryCode"].Value;
}

从IEnumerable获取数据

3 个答案: