How to read character in a file 1 by 1 c#

问题

I want my program to read a text file all characters 1 by 1 and whereever it finds inverted comma ( " ), it adds a semicolon before that inverted comma. For eg we have a paragraph in a text file as follow:

This is a paragraph which conains lots and lots of characters and some names and dates. My name "Sam" i was born at "12:00" "noon". I live in "anyplace" .

Now i want the output to be as follows :

This is a paragraph which conains lots and lots of characters and some names and dates. My name ;"Sam;" i was born at ;"12:00;" ;"noon;". I live in ;"anyplace;" .

It should open the file using file stream then reads character and then adds semicolon where it finds inverted comman. And the output should be equals to textbox1.text.

CODE TILL I MADE: -

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConsoleApplication1 {
    class Program
    {
        static void Main(string[] args)
        {

            char ch;
            int Tchar = 0;
            StreamReader reader;
            reader = new StreamReader(@"C:\Users\user1\Documents\data.txt");
            do
            {
                ch = (char)reader.Read();
                Console.Write(ch);
                if (Convert.ToInt32(ch) == 34)
                {
                    Console.Write(@";");
                }
                Tchar++;
            } while (!reader.EndOfStream);
            reader.Close();
            reader.Dispose();
            Console.WriteLine(" ");
            Console.WriteLine(Tchar.ToString() + " characters");
            Console.ReadLine();
        }
    }
}

OUTPUT:-

This is a paragraph which conains lots and lots of characters and some names and dates. My name ";Sam"; i was born at ";12:00"; ";noon";. I live in ";anyplace"; . 154 characters

I want that semicolon before the inverted comma. any help would be appreciated. Thanks

回答1:

Swap the order of the operations:

    if (Convert.ToInt32(ch) == 34)
    {
        Console.Write(@";");
    }
    Console.Write(ch);

e.g. don't write the original character until AFTER you've decided to output a semicolon or not.

回答2:

Try ch = (char)reader.Peek();

This will read tell you the next character without reading it. You can then use this to check if it is a " or not an insert : accordingly

if (Convert.ToInt32((char)read.Peek()) == 34) Console.Write(@";")

回答3:

Do you have to read in character by character? The following code will do the whole thing as a block and return you a list containing all your lines.

var contents = File.ReadAllLines (@"C:\Users\user1\Documents\data.txt")
                   .Select (l => l.Replace ("\"", ";\""));

来源：https://stackoverflow.com/questions/16618341/how-to-read-character-in-a-file-1-by-1-c-sharp

标签

filestream