从.TXT文件中检索字符串，然后在C#中解析它们 [英] Retrieve strings from a .TXT file and parse them in C#

问题描述

大家好，

我是编程的新手，并且正在学习视频课程以学习C#.

我需要一点帮助来进行此练习:

Hello everybody,

I''m quite new to programming, and I''m following a video-course in order to learn C#.

I need a little help to do this exercise:

1. 使用string打开 .TXT 文件，如下所示:
   

1. Open a .TXT file with strings like this:
   

+01/01/1918 11:59:59-1-2-3+

检索string(我以为一个)，并获取以"-"定界符开头的数字
(在这种情况下，数字为1 2 3)

求值每个数字(必须为0lt; n>< 10)>

如果数字超出范围，请显示一条消息(控制台)并处理下一个string

Retrieve the strings (one by one I presume) and get the numbers preceded by the "-" delimiter
(in this case, the numbers: 1 2 3)

Evaluate every number (must be 0<n><10)>

If a number is out of range, show a message (console) and process the next string

谢谢您的帮助.

Thank you for your help.

推荐答案

1)修剪前导/尾随''+:myLine = myLine.Trim(new char[] {''+''});

2)用``-''分隔每行:使用:char[] terms = myLine.Split(new char[] {''-''});

3)拆分将为您提供4个字符的char数组；使用System.DateTime.Parse(string, IFormatProvider, DateTimeStyles)或System.DateTime.ParseExact(string, string, IFormatProvider)将第一个(terms [0])解析为System.DateTime；确保使用适当的CultureInfo作为IFormatProvider的实例，以匹配特定于区域性的日期/时间格式(从您的示例中，您无法了解哪个数字是月份，哪个是天，但是您应该从区域性中了解这一点) ;在第二种情况下，请使用适当的显式格式字符串(请参阅下面的参考资料).

4)使用您的类型解析其他术语；由于-"是分隔符而不是符号，因此您的类型是无符号的；所以可能是byte, ushort, uint, ulong;在所有情况下，请使用Parse或TryParse，例如uint.Parse(term[index])，其中索引为1到3.

参见:
http://msdn.microsoft.com/en-us/library/system.string.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system.datetime.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/w2sa9yss.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx [ ^ ].

-SA

1) Trim leading/trailing ''+'': myLine = myLine.Trim(new char[] {''+''});

2) Split each line by ''-'': use: char[] terms = myLine.Split(new char[] {''-''});

3) The split will give you array of char with 4 terms; parse first one (terms[0]) to System.DateTime using System.DateTime.Parse(string, IFormatProvider, DateTimeStyles) or System.DateTime.ParseExact(string, string, IFormatProvider); make sure to use appropriate CultureInfo as an instance of IFormatProvider to match culture-specific date/time format (from your example, one cannot understand which number is month and which is day, but you should know this from the culture); in second case, use appropriate explicit format string (see references below).

4) Parse other terms using your type; as ''-'' is a delimiter and not sign, your type is unsigned; so it could be byte, ushort, uint, ulong; in all cases, use Parse or TryParse, for example uint.Parse(term[index]), where your index is 1 to 3.

See:
http://msdn.microsoft.com/en-us/library/system.string.aspx[^],
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^],
http://msdn.microsoft.com/en-us/library/w2sa9yss.aspx[^],
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx[^].

—SA

static void Main(string[] args)
{
    string text = "+01/01/1918 11:59:59-1-2-3+";
    string[] words = text.Split(''-'');
    List<string >buffer=new List<string>();
    //Initial vords
    foreach (var word in words)
    {
        Console.WriteLine(word);
        buffer.Add(word);
    }
    buffer.Remove(buffer[0]);//remove first words
    buffer[2] = buffer[2].Remove(buffer[2].Length - 1, 1);//remove simbol +
    //Show final list with result : 1, 2 , 3
    foreach (var aux in buffer)
    {
        Console.WriteLine(aux);
    }
    Console.ReadLine();
}

取决于格式的其余部分是否始终是安全的(事实并非如此) t包含-digit)，则可以使用正则表达式-\ d *"提取所有数字.如果它们总是彼此相邻，则可以使用(-\ d *)+"，该字符将匹配一次，并且其内部组将是每个数字.

Depending on whether the rest of the format is always safe (it doesn''t contain -digit), you can extract all the numbers with a regex "-\d*". If they are always right next to each other you can use "(-\d*)+", which will match once, and its inner groups will be each number.

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