how to remove empty line when reading text file using C# [closed]

Answer 1

Well, you should use the method "ReadLine()" from the StreamReader in a loop. When you receive an empty line, simply check if the string obtained from ReadLine() is empty. If it is, ignore the line. Try something like:

    StreamReader input = new StreamReader("...");
    String line = null;

    do 
    {
    line = input.ReadLine();

    if (line == null)
    {
    return;
    }

    if (line == String.Empty)
    {
    continue;
    }

    // Here you process the non-empty line

    } while (true);

Answer 2

Below is the code:

private void ReadFile()
{
    try
    {
        string line = null;
        System.IO.TextReader readFile = new StreamReader("C:\\csharp.net-informations.txt");
        while (true)
        {
            line = readFile.ReadLine();
            if (line != null)
            {
                MessageBox.Show(line);
            }
        }
        readFile.Close();
        readFile = null;
    }
    catch (IOException ex)
    {
        MessageBox.Show(ex.ToString());
    }
}

Answer 3

You haven't shown any code, and your description is pretty woolly, but as of .NET 4 this would be a very easy way to do what you want:

IEnumerable<string> lines = File.ReadLines().Where(line => line != "");

Note that it won't perform any trimming, so a line with only spaces in would still be returned.

Also note that the code above doesn't read the file when you just execute that line - it will only read it when you try to iterate over lines, and will read it again every time you iterate over lines. If you want to read it into memory all in one go, you might want:

List<string> lines = File.ReadLines().Where(line => line != "").ToList();