How to append text to all existing .txt documents in C#?

Question

So I have this code:

class Program
    {

        static void Main(string[] args)
        {
            // Set a variable to the My Documents path.
            string mydocpath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

            var dir = new DirectoryInfo(mydocpath + @"\sample\");
            string msg = "Created by: Johny";

            foreach (var file in dir.EnumerateFiles("*.txt")) 
            {
                file.AppendText(msg); //getting error here
            }
        }
    }

And I want to add a footer to all the text file in the sample folder, but I'm getting an error because the AppendText is not accepting a string argument. I was just wondering how do I do this?

score 1 · Answer 1 · answered Mar 03 '17 at 22:24

1

FileInfo.AppendText() creates a StreamWriter, it doesn't append text per se. You want to do this:

using (var sw = file.AppendText()) {
    sw.Write(msg);
}

answered Mar 03 '17 at 22:24

Tim

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score 1 · Accepted Answer · answered Mar 03 '17 at 22:24

You want to use the streamwriter from AppendText I think:

        static void Main(string[] args)
        {
            // Set a variable to the My Documents path.
            string mydocpath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

            var dir = new DirectoryInfo(mydocpath + @"\sample\");
            string msg = "Created by: Johny";

            foreach (var file in dir.EnumerateFiles("*.txt"))
            {
                var streamWriter = file.AppendText(); 
                streamWriter.Write(msg);
                streamWriter.Close();
            }
        }

score 0 · Answer 3 · answered Mar 03 '17 at 22:41

AppendText is the extension method for the StreamWriter, see the documentation

So you should write these code instead:

foreach (var file in dir.EnumerateFiles("*.txt")) 
{
    using (StreamWriter sw = File.AppendText(file.FullName))
    {
        sw.WriteLine(msg);
    }
}

How to append text to all existing .txt documents in C#?

3 Answers3