C#如何在多个文件中拆分文本文件

Question

如何将一个 1000 行的文本文件拆分为多个较小的文件，例如，每个文件 300 行？请记住，原始文件可能多于或少于一千行。

file1.txt 300 lines -> rest
file2.txt 300 lines -> rest
file3.txt 300 lines -> rest
file4.txt 100 lines 

我尝试了以下方法，但它不起作用。

int counter = 0;
string line;

string lineoutput = (current_dir + "\\" + DateTime.Now.ToString("HHmmss") + ".txt");

System.IO.StreamReader inputfile;

inputfile = new System.IO.StreamReader(new_path);
while ((line = inputfile.ReadLine()) != null)
{
    System.IO.StreamWriter file = new System.IO.StreamWriter(current_dir + "\\" + DateTime.Now.ToString("HHmmss") + ".txt", true);

    string _replaceBackspace = ReplaceBackspace(read_file.ReadLine().ToLower());

    using (StreamWriter writer = new StreamWriter(lineoutput, true))
    {
        if (counter == 5000)
        {
            counter = 0;
            lineoutput = (current_dir + "\\" + DateTime.Now.ToString("HHmmss") + ".txt");
        }
        writer.WriteLine(line.ToLower());
    }
    counter++;
}

Answer 1

最简单的情况:

        var reader = File.OpenText(infile);
        string outFileName = "file{0}.txt";
        int outFileNumber = 1;
        const int MAX_LINES = 300;
        while (!reader.EndOfStream)
        {
            var writer = File.CreateText(string.Format(outFileName, outFileNumber++));
            for (int idx = 0; idx < MAX_LINES; idx++)
            {
                writer.WriteLine(reader.ReadLine());
                if (reader.EndOfStream) break;
            }
            writer.Close();
        }
        reader.Close();