exact/match string in textfile

Question

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C#

How can I find exact/match string in textfile in c#?

Posted 29-May-12 22:47pm

mohsen10026

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Comments

Ed Nutting 30-May-12 4:52am

Homework or laziness? Look up in Google "c# read text from file" then look at the IndexOf function.
Ed

3 solutions

Solution 2

you can read file and match the string in the data of .txt file
here is simple example

C#

private int GetLinesNoFromFile(string FileNameWithPath,string searchString)
        {
            string[] bt = null;
            if (System.IO.File.Exists(FileNameWithPath))
            {
                bt = System.IO.File.ReadAllLines(FileNameWithPath);
            }

            for (int i = 0; i < bt.Length; i++)
            {
                string str = bt[i].ToString();
                if (str.Contains(searchString))
                    return i; // data found in line no
            }
            return -1; // nodata found
        }

Posted 29-May-12 23:39pm

Prosan

Comments

Prasad_Kulkarni 14-Jun-12 3:39am

5'ed!

Solution 3

Mohsen try this

private Boolean FindMyString(string thisFileName, string lookingFor, out int foundIt, out string errorMsg)
{
string entry=string.Empty ;
int fileIndex;

foundIt = 0;
errorMsg = string.Empty;
if (string.IsNullOrEmpty(thisFileName))
{
errorMsg = "No File passed on.";
return false;
}
if (!File.Exists(thisFileName))
{
errorMsg = "File name " + thisFileName + " does not exist?";
return false;
}
TextReader myTR = new StreamReader(thisFileName);
fileIndex = 0;
while ((entry = myTR.ReadLine()) != null)
{
if (entry.ToUpper().Trim().Contains(lookingFor))
{
foundIt = fileIndex+1;
myTR.Close();
return true;
}
}
errorMsg = lookingFor + " was not found in " + thisFileName + ".";
myTR.Close();
return false;

}

Example in your main function:

int foundIt=0;
string errorMsg=string.Empty;
string lookingFor="My FRIEND";
string thisFileName="c:\\Test.txt";

if (FindMyString(thisFileName, lookingFor, out foundIt, out errorMsg) == false)
Console.WriteLine("Your " + lookingFor + " was not found.");
else
Console.WriteLine("Your " + lookingFor + " was found at the point " + foundIt + ".");

Posted 29-May-12 23:50pm

Member1978

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Pete O'Hanlon · Accepted Answer · 2012-05-29T22:55:00

There are so many ways to achieve this. All start with reading the file in. Once you've read the file in, you could use one of the many string methods to identify the text, or you could use a regular expression. The appropriate technique really depends on what you are going to do with this information afterwards (e.g. if you need the position of the match, then a regular expression isn't the best choice).