Different ways of Reading a file in C#

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Anadi Sharma

More Detail

Here, we are reading two different files −

Reading text file −

Example

 Live Demo

using System;
using System.IO;

namespace FileApplication {
   class Program {
      static void Main(string[] args) {
         try {
            using (StreamReader sr = new StreamReader("d:/new.txt")) {
               string line;

               // Read and display lines from the file until
               // the end of the file is reached.
               while ((line = sr.ReadLine()) != null) {
                  Console.WriteLine(line);
               }
            }
         } catch (Exception e) {
            // Let the user know what went wrong.
            Console.WriteLine("The file could not be read:");
            Console.WriteLine(e.Message);
         }
         Console.ReadKey();
      }
   }
}

Output

The file could not be read:
Could not find a part of the path "/home/cg/root/4281363/d:/new.txt".

Reading binary file −

Example

using System.IO;

namespace BinaryFileApplication {
   class Program {
      static void Main(string[] args) {
         BinaryWriter bw;
         BinaryReader br;

         int i = 25;
         double d = 3.14157;
         bool b = true;
         string s = "I am happy";

         //create the file
         try {
            bw = new BinaryWriter(new FileStream("mydata", FileMode.Create));
         } catch (IOException e) {
            Console.WriteLine(e.Message + "\n Cannot create file.");
            return;
         }

         //writing into the file
         try {
            bw.Write(i);
            bw.Write(d);
            bw.Write(b);
            bw.Write(s);
         } catch (IOException e) {
            Console.WriteLine(e.Message + "\n Cannot write to file.");
            return;
         }
         bw.Close();

         //reading from the file
         try {
            br = new BinaryReader(new FileStream("mydata", FileMode.Open));
         } catch (IOException e) {
            Console.WriteLine(e.Message + "\n Cannot open file.");
            return;
         }

         try {
            i = br.ReadInt32();
            Console.WriteLine("Integer data: {0}", i);
            d = br.ReadDouble();
            Console.WriteLine("Double data: {0}", d);
            b = br.ReadBoolean();
            Console.WriteLine("Boolean data: {0}", b);
            s = br.ReadString();
            Console.WriteLine("String data: {0}", s);
         } catch (IOException e) {
            Console.WriteLine(e.Message + "\n Cannot read from file.");
            return;
         }

         br.Close();
         Console.ReadKey();
      }
   }
}

Chandu yadav

Updated on 22-Jun-2020 12:43:05

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