How to delete last line in a text file?

Question

I have a simple log text file with the extension of .txt with a white space line at the end of that text file every time the log file is generated from a 3rd party program.<

Answer 1

I just find a solution from other website, and this is the url https://stackoverrun.com/cn/q/627722 .

With a small number of lines, you could easily use something like this

string filename = @"C:\Temp\junk.txt";
string[] lines = File.ReadAllLines(filename);

However, as the files get larger, you may want to stream the data in and out with something like this

string filename = @"C:\Temp\junk.txt";
string tempfile = @"C:\Temp\junk_temp.txt";

using (StreamReader reader = new StreamReader(filename))
{                
       using (StreamWriter writer = new StreamWriter(tempfile))
       {
           string line = reader.ReadLine();

           while (!reader.EndOfStream)
           {
               writer.WriteLine(line);
               line = reader.ReadLine();
           } // by reading ahead, will not write last line to file
       }
}

File.Delete(filename);
File.Move(tempfile, filename);