Reading line by line from textfile

Question

I have a function in c# class which is reading a textfile into streamreader.Here is the c# function.

public readFile(string fileName, long startPosition = 0)
    {
        //Open the file as FileStream
        _fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
        _reader = new StreamReader(_fileStream);
        //Set the starting position
        _fileStream.Position = startPosition;

    }

and i am trying to call this function into another class and read the file line by line.

 private AddedContentReader _freader;
 protected override void OnStart(string[] args)
    {
            _freader = new AddedContentReader(file);    

    }

So my question is how to read the textfile line by line in the calling function

Please help me..

have you checked [this post](http://stackoverflow.com/questions/8037070/whats-the-fastest-way-to-read-a-text-file-line-by-line)? — Yuliam Chandra, Jul 25 '14 at 05:56

score 2 · Accepted Answer · answered Jul 25 '14 at 05:56

2

The StreamReader class has a method called ReadLine.

Sample

string line;
while((line = _reader.ReadLine()) != null)
{
   Console.WriteLine (line);
}

More Information

MSDN - StreamReader.ReadLine Method

answered Jul 25 '14 at 05:56

dknaack

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One small query `protected override void OnStart(string[] args) { _freader = new AddedContentReader(file); }` inside this method because i am keeping my logic here.. – user3816352 Jul 25 '14 at 06:07
If you want to use it in you OnStart method, why not return it from the readfile method. – dknaack Jul 25 '14 at 06:08
Iam not sure what you want to do exactly. Do you want to use your StreamReader in your OnStart Method? What is you AddedContentReader doing? – dknaack Jul 25 '14 at 06:12

Balaji Kondalrayal · Answer 2 · 2014-07-25T06:35:32.330

0

Use while loop to read till the line is empty or nil. I hope below code will help you.

TextReader yourfile;
yourfile = File.OpenText("Your File Path");

while ((str = yourfile.ReadLine()) != null)
            {

//write your code here
}

yourfile.Close();

edited Jul 25 '14 at 06:35

answered Jul 25 '14 at 06:01

Balaji Kondalrayal

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Sir, what is the data type of yourFile? A foo or a bar? – Yuliam Chandra Jul 25 '14 at 06:03

score 0 · Answer 3 · edited Jul 25 '14 at 06:42

0

One way to do it is to get all the lines first and then loop through them using the readlines method of system.IO in code such as the following:

            string[] lines = File.ReadAllLines(fileName);
            int count = 0;                

            while(lines.Length > count)
            {
                function1(lines[count]]);
                count++;        
            }

edited Jul 25 '14 at 06:42

Brian Low

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answered Jul 25 '14 at 06:20

Robert Anderson

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I think the loop is infinite and it will get out of it. I think you should use count instead of 0 in while loop – Balaji Kondalrayal Jul 25 '14 at 06:37

Reading line by line from textfile

3 Answers3

Sample

More Information