c# File.ReadAllLines doesn't read blank lines-CodePudding

I am using c# for reading some txt documents and writing/deleting some lines in them I have to read a text document, delete some of it's lines and then save it again in the same path. It worked all good until I realized that it doesn't read empty lines or when there is just a space in a new line :(.

Here's my text file structure:

-Name
-LastName
-Age
-Phone
-Address
-Address2(optional) -// this line will be deleted
-Address3(optional) -// this line will be deleted
****here comes the empty line****

Here's my code:

        List<string> myLines = File.ReadAllLines(path).ToList();
        
        if (myLines.Count > 5)
        {
            for(int i = 7; i >= 5; i--)
            {
                myLines.RemoveAt(i);
            }
            File.WriteAllLines(path, myLines.ToArray());
        }

So I don't know why when I run File.ReadAllLines will give me 7 lines (ignoring the blank one) and of course after I delete something in the file, the blank line is still there.

Note: I am working with more than 100k files, either way I would just delete that specific line by hand.

Can you help me sort this out and delete that blank line? Thank you.

CodePudding user response：

Here's some code:

    var f = @"-Name
-LastName
-Age
-Phone
-Address
-Address2(optional) -// this line will be deleted
-Address3(optional) -// this line will be deleted

-Name2";

    File.WriteAllText(@"C:\temp\a.txt", f);

    var f2 = File.ReadAllLines(@"C:\temp\a.txt").ToList();

    f2.RemoveAt(7);
    f2.RemoveAt(6);
    f2.RemoveAt(5);

    File.WriteAllLines(@"C:\temp\b.txt", f2);

Open the two resulting files a.txt and b.txt in c:\temp (make sure you have a c:\temp) - the a has blank lines, the b has no interim blank lines or address2/3

..but do note that b has a blank line at the end, because File.WriteAllLines will end the final line (Name2 in my example) with a CRLF.

If this is what you're talking about/you don't want, consider something else instead, perhaps:

File.WriteAllText(@"C:\temp\b.txt", string.Join(Environment.NewLine, f2));