Program to read first five words from a file without reading the full file in C#

Question

1.00/5 (5 votes)

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i do not want to read the entire file. i just want my program to read first five words from the file.

What I have tried:

i used readalllines and readalltext.. but it read the whole file

Posted 7-Jan-18 22:37pm

c#Beginnerrrr

Updated 7-Jan-18 22:55pm

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Richard MacCutchan 8-Jan-18 4:43am

Then don't use readalllines/readalltext.

4 solutions

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Kenneth Haugland · Answer 1 · 2018-01-07T22:48:00

Solution 1

TextReader is nice:[^]

example from link:

using (TextReader reader = File.OpenText(@"C:\perl.txt"))
{
    string line = reader.ReadLine();
    Console.WriteLine(line);
}

Posted 7-Jan-18 22:48pm

Kenneth Haugland

Kornfeld Eliyahu Peter · Answer 2 · 2018-01-07T22:48:00

Solution 2

So read it char-by-char and stop after 5 words...
StreamReader.Read Method (Char[], Int32, Int32) (System.IO)[^]

Posted 7-Jan-18 22:48pm

Kornfeld Eliyahu Peter

CPallini · Answer 3 · 2018-01-07T22:54:00

Solution 4

Repeadly use Readline, until you get the required words. See, for instance: How to: Read a Text File One Line at a Time (Visual C#) | Microsoft Docs[^].

Posted 7-Jan-18 22:54pm

CPallini

Karthik_Mahalingam · Answer 4 · 2018-01-07T22:52:00

Solution 3

try

string filePath = @"D:\Tools\abc.txt";
        string first5Words = "";
        int maxWords = 5, count = 0;
        using (StreamReader reader = new StreamReader(filePath))
        {
            while (reader.Peek() >= 0)
            {
               char c = (char)reader.Read();
               char[] ChartoFindNewWord = { ' ', '\t', '\n', '\r' };
                if(ChartoFindNewWord.Contains(c))
                {
                    count++;
                    if(count >= maxWords)
                    break;
                }
                first5Words += c; 
            }
            
        }

        string output = first5Words;

Posted 7-Jan-18 22:52pm

Karthik_Mahalingam

Updated 7-Jan-18 22:53pm

v2

Comments

c#Beginnerrrr 8-Jan-18 5:03am

Will have a try..Thank you:)

Karthik_Mahalingam 8-Jan-18 5:07am

ok, let know if you face any issue

c#Beginnerrrr 8-Jan-18 5:38am

ya its working fine....i have one more query.. can you please help me with this?

Karthik_Mahalingam 8-Jan-18 5:40am

If the query is related to this thread then proceed, else post a new question.

c#Beginnerrrr 8-Jan-18 5:48am

okay