CODEWITHSUNDEEP
c#filevariablessearchtext
oldmanpete
oldmanpete

Reputation: 57

Search text file for user variable - Whats wrong with this code

Trying to read from a text file based on a user variable entry

my entry has variations (upper/lower case) of the name "Big Fred"

The code runs but I am getting no results back.

The code on my laptop points to specific location which I have removed from the code below.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ReadTextFileWhile
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the name you wish to search for: ");                       //Prompt user for the name they wish to search for
            string x = Console.ReadLine();                                                      //assign the name the user inputs as their search parameter to the value of x
            StreamReader myReader = new StreamReader("C:/insert location here");      //Read the the text file at this location and assign to myReader
            string line = "";                                                                   //asssign 'nothing' to line.

            while (line != null)                                                                //while line in the text file is not null (empty)
            {
                line = myReader.ReadLine();                                                     //pass contents of myReader to line
                if (line != null && line == x)                                                  //if contents of line are not null and equal to the variable in x print to screen
                    Console.WriteLine(line);
            }

            myReader.Close();                                                                   //close myReader properly
            Console.ReadLine();                                                                 //Readline to keep console window open allowing a human to read output.

        }
    }
}

Upvotes: 1

Views: 549

Answers (3)

Santosh Panda
Santosh Panda

Reputation: 7341

The reason why you are getting the every line from the text file is very simple. You might have copied the text content from a web page or some where else.; and there each line is not separated by a new line constant either \n or Environment.NewLine. So what you need to d is either Open the file and after each line press Enter key to manually insert new line OR read all test from the file and Split it by Dot[.] separator and use above code to process it individually. I faced the same prob & now it is working fine.

Upvotes: 0

PSL
PSL

Reputation: 123739

You just want to match the string in caseInsensitive fashion correct. You can use .Equals

if (line.Equals(x,StringComparison.InvariantCultureIgnoreCase));

Another thing is:- You can use 

String.IsNullOrWhiteSpace(line) or String.IsNullOrEmpty(line)

instead of checking if is null

Upvotes: 1

Steve
Steve

Reputation: 216313

Try with string.IndexOf and its overload that excludes case differences

line = myReader.ReadLine();                                                     
if (line != null && line.IndexOf(x, StringComparison.CurrentCultureIgnoreCase) >= 0)
      Console.WriteLine(line);

Upvotes: 1

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