Retrieve strings from a .TXT file and parse them in C#

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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:

Open a .TXT file with strings like this:
```
+01/01/1918 11:59:59-1-2-3+
```
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

Thank you for your help.

Posted 19-Jun-11 12:06pm

Ben Mueller Jr

Updated 19-Jun-11 15:45pm

Deeksha Shenoy

v2

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2011-06-19T14:19:00

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

Vladislav Socolov · Answer 2 · 2011-06-19T20:34:00

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();
}

BobJanova · Answer 3 · 2011-06-20T05:18:00

Solution 3

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.

Posted 20-Jun-11 5:18am

BobJanova

Retrieve strings from a .TXT file and parse them in C#

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Retrieve strings from a .TXT file and parse them in C#

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