linq - 使用 Linq 解析文本文件

Question

我有一个格式如下的日志文件，您可以看到每个日志都以时间开头，以竖线分隔符结尾。

将每个以日期时间开始并以竖线分隔符结束的日志放入列表中

如何解析此文本文件并将日志放入集合中？我似乎在确定如何找到日志的开头和结尾并在每个日志中读取它时遇到问题

下面是一个简单的示例，可以让您了解我正在尝试做什么。任何指针帮助等......非常感谢

日志示例

        08:52:03.260|Error| Stack Trace and other info removed here|
        lots of info about the  stack trace
        lots of info about the  stack trace
        lots of info about the  stack trace
        lots of info about the  stack trace
        lots of info about the  stack trace|  
       09:52:03.260|Error| Stack Trace and other info removed here|
        lots of info about the  stack trace
        lots of info about the  stack trace
        lots of info about the  stack trace
         lots of info about the  stack trace
        lots of info about the  stack trace|
       09:52:03.260|Error|Stack Trace and other info removed here|
       lots of info about the  stack trace
       lots of info about the  stack trace
       lots of info about the  stack trace
       lots of info about the  stack trace
       lots of info about the  stack trace|

文件 2 场景 我的订单

        Quantity Description                    Price
        1        shoes                  £1.00
        Total                                   £1.00
        No:    34343345      


        =============================================
        My Order           


        Quantity Description                    Price
        1        TShirt        £1.00
        Total                                   £1.00
        No:    32234234



        ============================================

程序:

  class Program
  {
    static void Main(string[] args)
    {
        string path = @"MyTestLog.log";
        string aa = string.Empty;

        List<LogMessage>logMessages=new List<LogMessage>();
        using (StreamReader reader = new StreamReader(path))
        {
            //????
            logMessages.Add(new LogMessage
            {
                Time = ??,
                ErrorLevel = ,
                Details = ??
            });
        }
    }
}

public class LogMessage
{
    public DateTime Time { get; set; }
    public string ErrorLevel { get; set; }
    public string Details { get; set; }
    //other stuff here
}

Answer 1

你可能想试试这个:

var list =
    from line in File.ReadAllLines("log.txt")
    where line.EndsWith("|")
    let parts = line.Split('|')
    where parts.Length >= 2
    where IsDateTime(parts[0])
    select new LogMessage()
    {
        Time = DateTime.Parse(parts[0]),
        ErrorLevel = parts[1],
        Details = parts[2]
    };

还有这个简单的辅助方法:

private static bool IsDateTime(string time)
{
    DateTime temp;
    return DateTime.TryParse(time, out temp);
}

更新:当你使用 .NET 4.0 时，你应该使用 File.ReadLines而不是 File.ReadAllLines。这可以防止将整个文件加载到内存中。