c# – 从文本文件中删除最后一行

string filename = @"C:Tempjunk.txt";

string[] lines = File.ReadAllLines(filename);
File.WriteAllLines(filename,lines.Take(lines.Count() - 1));

但是,随着文件变大,您可能希望使用类似的方式将数据流入和流出

string filename = @"C:Tempjunk.txt";
string tempfile = @"C:Tempjunk_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);