Extract two different lines from HTML file and write in a text file using C#

Question

1.00/5 (1 vote)

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I need to extract the lines which contains <title> and <Header> from 500 HTML files stored in a folder.
I tried the code below, but when I execute it, it is telling error in streamwriter.

What I have tried:

foreach (string arg in Directory.GetFiles(@"C:\Users\htmlfiles") )
           {
               string line;
               StreamReader file =new StreamReader(arg,Encoding.GetEncoding(1252));
               StreamWriter file2 = new  StreamWriter(@"C:\Users\outputfile.txt");
               while ((line = file.ReadLine()) != null)
               {
                       if (line.Contains("<TITLE>"))
                       {
                          file2.WriteLine(line);
                       }
                       if (line.Contains("<HEADER>"))
                       {
                           file2.WriteLine(line);
                       }

                   }
         file2.Close();
               }
           }

Posted 8-Feb-19 5:01am

Priya Karthish

Updated 8-Feb-19 8:56am

RickZeeland

v3

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Comments

F-ES Sitecore 8-Feb-19 11:07am

If your code is throwing an error always say what the error message is, it's there for a reason.

Secondly you might want to look at the HTML Agility Pack to do this for you. The issue with your code is that it won't work for when the tag is split across lines

<title>
My Title
</title>

2 solutions

Solution 1

C#

StreamWriter file2 = new StreamWriter(@"C:\Users\outputfile.txt");

You are not allowed to create files in C:\Users. Use a folder in one of the appropriate locations, e.g. Documents, AppData\Local etc.

Posted 8-Feb-19 5:16am

Richard MacCutchan

Comments

Priya Karthish 8-Feb-19 13:41pm

I need to extract the content between <title> tag and <H1> tag. First I thought, i ll just extract those two lines completely and keep it in a file. For that only I wrote that c# code.
Error: Couldn't write in Streamwriter.
I changed the directory and checked, still the same error is coming

Richard MacCutchan 9-Feb-19 4:18am

What directory, and what error?

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RickZeeland · Accepted Answer · 2019-02-08T08:56:00

int counter = 0;
string line;

System.IO.StreamReader file = new System.IO.StreamReader(@"Test.html");
System.IO.File.WriteAllText("TestOut.txt", string.Empty);

while ((line = file.ReadLine()) != null)
{
    if (line.Contains("<TITLE>") || line.Contains("<H1>"))
    {
        System.Console.WriteLine(line);
        System.IO.File.AppendAllText("TestOut.txt", line + Environment.NewLine);
        counter++;
    }
}

file.Close();
System.Console.WriteLine("{0} lines found.", counter);