reading text lines from a txt file

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0.00/5 (No votes)

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Hi Guys
I am trying to read some texts from txt file line by line and for example print it in console window, so I write these codes :

C#

namespace test1
{
    class Program
    {
        static void Main(string[] args)
        {
            
            StreamReader A;
            A = new StreamReader("a.txt");
            string line = A.ReadLine();
            while (line!=null)
            {
                Console.WriteLine(line);
            }
            Console.ReadKey();
            
        }
    }
}

my txt file contains 3 line of text : 1- ali goes to school 2- water is hot 3- I am tired
so when run the program console windows show up and print the first line of text repetitive and don't stop until I close that.
I have two problem: first why this program reads only line1 of my text and don't read other lines, second why this won't stop printing

thanks everyone

Posted 28-Mar-13 0:57am

ali_crash

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3 solutions

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Andreas Gieriet · Accepted Answer · 2013-03-28T01:01:00

Solution 2

Use the proper function instead of re-inventing the wheel: see File.ReadAllLines(...)[^].
Andi

PS: In your example, you don't read the next line inside the loop.

Posted 28-Mar-13 1:01am

Andreas Gieriet

Updated 28-Mar-13 1:02am

v2

Comments

Thomas Daniels 28-Mar-13 7:05am

+5!

Andreas Gieriet 28-Mar-13 8:44am

Thanks for your 5!
Andi

phil.o · Accepted Answer · 2013-03-28T01:00:00

Solution 1

If I were you, I would try :

C#

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

Your problem is you create an infinite loop in your while block ; you have to modify your line variable inside the loop if you want a chance to escape it sometime.

Hope this helps.

Posted 28-Mar-13 1:00am

phil.o

v2

Comments

Thomas Daniels 28-Mar-13 7:07am

I voted 4 because this works, but it's easier to store all lines in a string array using File.ReadAllText, and then iterate over the lines (see Solution 2).

phil.o 28-Mar-13 7:39am

OK, thanks :)
I think that understanding why it was not working in the first place is as important for the OP as having an easier solution.

Thomas Daniels 28-Mar-13 8:15am

I understand, thanks to clarify that!

Andreas Gieriet 28-Mar-13 8:53am

My 5 for your explanation.
It's a matter of knowing the .Net library. For the tiny data set as suggested in the sample code, I vote for File.ReadAllLines. For huge data, line-wise processing is advided, though.
And the OP could have searched for Google: C# text file read line and would have found the top hit How to: Read Text from a File which shows more or less your solution...
Cheers
Andi

ali_crash 28-Mar-13 7:43am

thanks man
helped me a lot :D

phil.o 28-Mar-13 7:49am

Thanks!
As I told before, other solutions are more straightforward ; but it's also important for you to understand the reason of your problem.
I hope you will apply this acquired knowledge in your future codings.

Hariharan Arunachalam · Accepted Answer · 2013-03-28T01:06:00

Your code should be

C#

namespace test1
{
    class Program
    {
        static void Main(string[] args)
        {
            
           StreamReader A;
            A = new StreamReader("A.txt");           
            
            while (!A.EndOfStream)
            {
                Console.WriteLine(A.ReadLine());
            }
            Console.ReadKey();
            
        }
    }
}