c# File IO using Reading from and Writing into Binary Files

The BinaryReader and BinaryWriter classes are used for reading from and writing to s binary file.

The BinaryReader class:

The BinaryReader classes is used to read Binary data from a file. A BinaryReader object is created by passing a FileStream Object to its constructor.

some of the commonly used method of BinaryReader class :

• Close()  >> it closes the BinaryReader object and the underlying stream.
• Read()  >> read the character from the underlying stream.
• ReadBoolean()  >> reads a boolean value from current stream and advances current the position of the stream.
• ReadByte()  >> reads the next bytes from the current stream.
• ReadChar() >> reads the next character from the current stream.
• ReadDouble() >> reads an floating points value from the current stream.
• ReadString() >> reads a string from a current stream.

The BinaryWriter Class:

The BinaryWriter class is used to Write data to a stream. A BinaryWriter object is created by passing a FileStream object to its constructor.

some of the commonly used method of BinaryWriter class :

• Close()  >> its close the BinaryWriter class object and underlying stream.
• Flush()   >> clear all buffer for the current writer.
• Seek(int offset , SeekOrigin Origin)  >> sets the position within the current stream.
•  Write(bool value)  >> write a one-byte boolean value to the current stream.
• Write(byte value)  >> write an unsigned byte to the current stream.
• Write(byte[] buffer)  >> writes a byte array to the underlying stream.
• Write(string value)  >> reads a string value from the current stream.

Example:

using System.IO;

namespace binaryreader_and_binarywriter_classes.cs

{

    public class RWDATA

    {

        static void Main(string[] args)

        {

            int i = 10;

            double d = 1023.23;

            bool b = true;

            FileStream fs = new FileStream("C://USING IO/testdata",FileMode.Create);

            BinaryWriter dataout = new BinaryWriter(fs);

            Console.WriteLine("writing"+i);

            dataout.Write(i);

            Console.WriteLine("writing"+b);

            dataout.Write(b);

            Console.WriteLine("writing"+d);

            dataout.Write(1023.23);

            dataout.Close();

            Console.WriteLine("");

            // now read them back

            FileStream fs1 = new FileStream("C://USING IO/testdata", FileMode.Open);

            BinaryReader datain = new BinaryReader(fs1);

            i = datain.ReadInt32();

            Console.WriteLine("reading "+ i);

            b = datain.ReadBoolean();

            Console.WriteLine("reading "+ b);

            d = datain.ReadDouble();

            Console.WriteLine("reading "+1023.23);

            Console.ReadLine();

            datain.Close();

        }

    }

}

output :

Reference Link :