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C# StreamReader and StreamWriter

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StreamReader and StreamWriterare classes are inherited from the base class Stream, these classes are used to read and write from a file.

You may go through the File I/O.

C# StreamReader Class

The StreamReader class inherits from TExtReader class. It is used for reading data from a file. The most used method in this class are:

  • Close(): It closes the Streamreader object or any resources assosciateed with it.
  • Peek(): It returns the next available character but does not consume it.
  • Read(): It reads the next characer in input stream and increases the charcter position by one.
  • ReadLine(): It reads the line from input stream and returns the data in the form of string.
  • Seek(): This method is used to read or write the data at a specific location from a file.

Example: C# program for StreamReader

Let us create a file called sample.text for this example and the following string is present there:

This is a Website.
This is Simple2code.com. Visit again.

using System;
using System.IO;

namespace FileProgram
{
  class Program
  {
    static void Main(string[] args)
    {
      StreamReader sr = new StreamReader("sample.txt");
      string str = sr.ReadLine();

      while (str != null)
      {
        Console.WriteLine(str);
        str = sr.ReadLine();
      }

      sr.Close();
    }
  }
}

Output: The string present in a sample.text will be displayed on the screen.

This is a Website.
This is Simple2code.com. Visit again.

C# StreamWriter Class

StreamWriter class inherits TextWriter class. it is used to write a series of characters to a stream in a particular format. The most used method in this class are:

  • Close(): This methosd closes the current StreamWriter object and all the resources assosciated with it.
  • Flush(): It clears all the data from the buffer and write it in the stream associate with it.
  • Write(): It is used to write data to a stream.
  • WriteLine(): It writes the the data to a stream and adds the newline character at the end of the data.

Example: C# program for StreamWriter

The following program creates a new file and writes data into that file. The data is provided in the program.

using System;
using System.IO;

namespace FileProgram
{
  public class Program
  {
    public static void Main(string[] args)
    {
      FileStream file = new FileStream("sample.txt", FileMode.Create);
      StreamWriter sw = new StreamWriter(file);

      sw.WriteLine("This is Simple2code.com. Visit again.");
      sw.Close();
      file.Close();

      Console.WriteLine("The file is created.");
    }
  }
}

Output:

The file is created.

After execution, open the newly created file “sample.text”, you will find the following data.

This is Simple2code.com. Visit again.

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