What are file operations in C#?

C# has the following file operations -

• Create, open, read and write files.
• Append,
• Delete, etc.

The FileStream class in the System.IO namespace facilitates reading, writing, and closing files. This class is derived from the abstract class Stream.

You need to create a FileStream object to create a new file or open an existing file. The syntax for creating a FileStream object is as follows -

FileStream = new FileStream( <file_name>, <FileMode Enumerator>,
<FileAccess Enumerator>, <FileShare Enumerator>);

This also includes file operations, as shown below -

FileMode The enumerator defines various methods for opening files. The members of the FileMode enumerator are -

• Append - It opens an existing file and places the cursor at the end of the file, or creates the file if it does not exist document.

• Create - Creates a new file.

• CreateNew - It specifies that the operating system should create a new file.

• Open − It opens an existing file.

• OpenOrCreate − It specifies to the operating system that the file should be opened if it exists, otherwise a new file should be created.

• Truncate - It opens an existing file and truncates its size to zero bytes.

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FileAccess - FileAccess enumerator has members -

• Read,
• ReadWrite and
• Write.

FileShare - The FileShare enumerator has the following members -

Inheritable - It allows file handles Pass inheritance to child process

• None - it refuses to share the current file

• for reading - It allows the file to be opened for reading.

• ReadWrite - It allows opening a file for reading and writing

• Write - It allows opening a file for writing

Let's see an example of creating, opening and reading the contents of a file -

Example

Live Demonstration p>

using System;
using System.IO;

namespace FileIOApplication {
   class Program {
      static void Main(string[] args) {
         FileStream F = new FileStream("test.dat", FileMode.OpenOrCreate,
         FileAccess.ReadWrite);
         for (int i = 1; i <= 20; i++) {
            F.WriteByte((byte)i);
         }
         F.Position = 0;
         for (int i = 0; i <= 20; i++) {
            Console.Write(F.ReadByte() + " ");
         }
         F.Close();
         Console.ReadKey();
      }
   }
}

Output

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 -1

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