how do you check if text from a textbox is found in a text file?

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Hi, I want to see if text typed into a textbox is contained in a text file.
So if I were to type "hello" in the textbox I would like to know if the text file has that word, Thanks.

Posted 12-May-12 10:57am

MR. AngelMendez

Updated 12-May-12 22:26pm

charles henington

v2

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charles henington · Accepted Answer · 2012-05-12T12:38:00

Solution 1

C#

public bool checkForText(string filePath, string textBoxText)
{       
   using (System.IO.StreamReader reader = new System.IO.StreamReader(filePath))
   {
       string[] linesToComapare = reader.ReadToEnd().Split('\n');
       for (int i = 0; i < linesToCompare.Count(); i++)
       {
          if (linesToCompare[i].Contains(textBoxText))
           {
               return true;
           }
       }
   }
      return false;
}

Posted 12-May-12 12:38pm

charles henington

Comments

MR. AngelMendez 12-May-12 21:53pm

thanks, both solutions are helpful. I will check into it.

VJ Reddy 12-May-12 22:43pm

Good answer. 5!

charles henington 13-May-12 4:29am

Thanks VJ :) Great example to you as well

Wendelius 13-May-12 3:31am

Nice

charles henington 13-May-12 4:19am

Thanks Mika :)

Maciej Los 13-May-12 4:33am

Good answer, a 5!

Maciej Los · Accepted Answer · 2012-05-12T13:24:00

Solution 2

You can use LiNQ[^]!

Examples to find string in a text file:
Text file processing...[^]
read text file word by word using linq[^]

If you would like to read delimited files:
Using LINQ to read delimited text files[^]
tutorial reading a text file using linq[^]

And another example:
How to: Query for Sentences that Contain a Specified Set of Words (LINQ)[^]

Posted 12-May-12 13:24pm

Maciej Los

Comments

charles henington 12-May-12 22:10pm

Great link on the read text file word by word using linq!!! My 5

Maciej Los 13-May-12 4:32am

Thank you ;)

VJ Reddy 12-May-12 22:42pm

Good references, particularly the last one. 5!

Maciej Los 13-May-12 4:32am

Thank you ;)

Wendelius 13-May-12 2:57am

Really good

Maciej Los 13-May-12 4:33am

Thank you ;)

VJ Reddy · Accepted Answer · 2012-05-12T17:02:00

Solution 3

The references given by losmac in Solution 2 are good.

In case if you want to only check whether a word typed in the TextBox is present in the text file then I think the Regex option is simple to use as shown below

C#

if (Regex.IsMatch(System.IO.File.ReadAllText(textFileName),
        string.Format(@"\s+{0}\s+",TextBox1.Text),
        RegexOptions.CultureInvariant | RegexOptions.IgnoreCase))
            MessageBox.Show("Found");

If you want to match case then remove | RegexOptions.IgnoreCase part in the above statement.

Posted 12-May-12 17:02pm

VJ Reddy

Comments

Wendelius 13-May-12 3:33am

Very nice

VJ Reddy 13-May-12 3:50am

Thank you, Mika :)

charles henington 13-May-12 4:20am

Very nice VJ.. I haven't looked into regex much but it seems to be a very useful tool that would be worth looking into :)

VJ Reddy 13-May-12 4:30am

Thank you, charles :)

Maciej Los 13-May-12 4:32am

Great answer! +5

VJ Reddy 13-May-12 4:38am

Thank you, losmac :)