What are the different FileMode options available in FileStream?

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ICSM Computer · Answer

The FileMode enumeration in C# defines how the FileStream should open or create a file. Here's a breakdown of the available options:
and FileMode Options
FileMode
Description
Append
Opens the file if it exists and seeks to the end, or creates a new file. Only for writing.
Create
Creates a new file. If it exists, overwrites it.
CreateNew
Creates a new file. If the file already exists, throws an 
IOException.
Open
Opens an existing file. If the file does not exist, throws a
FileNotFoundException.
OpenOrCreate
Opens the file if it exists; otherwise, creates a new file.
Truncate
Opens an existing file and truncates it to zero bytes. File 
must exist.
Example Usage
// Create a new file or overwrite if it exists
var fs = new FileStream("file.txt", FileMode.Create);
// Open existing file or throw if not found
var fs2 = new FileStream("file.txt", FileMode.Open);
// Create new file only if it doesn't exist
var fs3 = new FileStream("file.txt", FileMode.CreateNew);
Each FileMode can be paired with FileAccess and 
FileShare for more control.
and

FileMode	Description
`Append`	Opens the file if it exists and seeks to the end, or creates a new file. Only for writing.
`Create`	Creates a new file. If it exists, overwrites it.
`CreateNew`	Creates a new file. If the file already exists, throws an `IOException`.
`Open`	Opens an existing file. If the file does not exist, throws a `FileNotFoundException`.
`OpenOrCreate`	Opens the file if it exists; otherwise, creates a new file.
`Truncate`	Opens an existing file and truncates it to zero bytes. File must exist.

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What are the different FileMode options available in FileStream?

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`FileMode` Options

Example Usage

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