Read numbers from a text file in C#

Question

This is something that should be very simple. I just want to read numbers and words from a text file that consists of tokens separated by white space. How do you do this in

Answer 1

Here is my code to read numbers from the text file. It demonstrates the concept of reading numbers from text file "2 3 5 7 ..."

public class NumberReader 
{
    StreamReader reader;

    public NumberReader(StreamReader reader)
    {
        this.reader = reader;
    }

    public UInt64 ReadUInt64()
    {
        UInt64 result = 0;

        while (!reader.EndOfStream)
        {
            int c = reader.Read();
            if (char.IsDigit((char) c))
            {
                result = 10 * result + (UInt64) (c - '0');
            }
            else
            {
                break;
            }
        }

        return result;
    }
}

Here is sample code to use this class:

using (StreamReader reader = File.OpenText("numbers.txt"))
{ 
    NumberReader numbers = new NumberReader(reader);

    while (! reader.EndOfStream)
    {
        ulong lastNumber = numbers.ReadUInt64();
    }
}