如何读取文本文件中的特定部分？

Question

I have a really big text file (500mb) and i need to get its text. Of course the problem is the exception-out of memory, but i want to solve it with taking strings (or char arrays) and put them in List. I search in google and i really don't know how to take a specific part. * It's a one long line, if that helps.

Answer 1

Do that:

using (FileStream fsSource = new FileStream(pathSource,
        FileMode.Open, FileAccess.Read))
    {

        // Read the source file into a byte array.
        int numBytesToRead = // Your amount to read at a time
        byte[] bytes = new byte[numBytesToRead];

        int numBytesRead = 0;
        while (numBytesToRead > 0)
        {
            // Read may return anything from 0 to numBytesToRead.
            int n = fsSource.Read(bytes, numBytesRead, numBytesToRead);

            // Break when the end of the file is reached.
            if (n == 0)
                break;

            // Do here what you want to do with the bytes read (convert to string using Encoding.YourEncoding.GetString())
        }
    }

Answer 2

您可以使用StreamReader类读取文件的各个部分。