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( , , , );

This also includes file operations, as shown below -

FileModeThe 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 -

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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< /p>

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

Example

Live Demonstration

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(); } } }

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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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