asked on

concatenate 5 files dropping blank lines, using c# dot net

Using Visual Studio 2013 c# project.

I want to read 5 text files into a single file skipping over blank lines in the 5 input files.

What's the best way of doing this.

I would like to use streamWriter but I can't see a way to append.

But any other way is fine with me as long as it works.

Thanks.

ASKER CERTIFIED SOLUTION

ktaczala

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gateguard

ASKER

So this writes to a new file:

new StreamWriter("c:\\file.txt");

And this appends to an existing file:

new StreamWriter("c:\\file.txt", true);

?

Thanks.

ktaczala

Correct.

https://msdn.microsoft.com/en-us/library/36b035cb%28v=vs.110%29.aspx

SOLUTION

Franck Gaspoz

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gateguard

ASKER

Thanks to both of you.

Fernando Soto

Hi gateguard;

A little late but have a look at this.

using System.IO;
using System.Text.RegularExpressions;

// Get the file names that are going to be appended
DirectoryInfo dir = new DirectoryInfo("C:/Working Directory/");
List<string> fnames = dir.GetFiles("file?.txt").Select(f => f.FullName).ToList();

// String to hold appended text
String fileText = "";

// Read and append data
foreach(string fn in fnames)
{
    string ft = File.ReadAllText(fn).Trim() + "\r\n";
    fileText += ft;
}

// Remove all blank line
fileText = Regex.Replace(fileText, "(\r\n){2,}", "\r\n");

// Create a StreamWriter
StreamWriter sw = new StreamWriter("C:/Working Directory/filesAppended.txt");
// Write the data out
sw.Write(fileText);
// Close the file.
sw.Close();

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