Method Create (), Open () method - Object-oriented programming

Create () method

The Create () method of the Filelnfo class is the main method for creating new files. It returns a reference to an object of type FileStream, which can perform read/write operations on the created file. After you finish working with the FileStream object, you must close this object (stream) to free up the resource:

// Create a new file on device C:

Filelnfo f = new Filelnfo (@ C: Test.dat );

FileStream fs = f.Create ();

//. . . we are working with a new file

// Close the file stream

fs.Close ();

Open () method

To open an existing file or create a new file, you can use the Open () method of the Filelnfo class. The Open () method allows you to describe the created file more accurately than the Create () method. The result of executing the Open () method is a reference to the FileStream object:

// Create a new file using the Open method ()

Filelnfo f2 = new Filelnfo (@ C: Test2.dat );

FileStream fs2 = f2.0pen (FileMode.OpenOrCreate,

FileAccess.ReadWrite, FileShare.None);

// ...

fs2.Close ();

There are several overloaded Open () methods. The main variant of this method takes three parameters.

The first parameter describes the general information about opening a file (for example: creating a new file, opening an existing file, adding data to the end of the file, etc.), which is set using the FileMode enumeration (Table 9.4):

public enum FileMode {CreateNew, Create, Open, OpenOrCreate, Truncate, Append}

The second parameter is the value of the FileAccess enumeration that defines the types of I/O operations that are performed: public enum FileAccess {Read, Write, Read Write}

Finally, the third parameter, FileShare, specifies the mode of working with this file with different applications: public enum FileShare {None, Read, Write, ReadWrite}

Table 9.4

FileMode enumeration elements

Item

Description

CreateNew

Create a new file. If a file with this name already exists, an IOException will be thrown

Create

Create a new file. If a file with this name already exists, it will be overwritten

Open

Open an existing file. If such file is not present, the exception FileNotFoundException will be generated

OpenOrCreate

open the file if it already exists; if not, then it is created

Truncate

opening a file and deleting its contents to a size of 0 bytes

Append

open the file, move to the end of the file content and go into the write mode (this value can only be used with a write-only stream).

If there is no such file, it is created

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