File paths and Directory operations in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a file path in C#?

A file path is a string that shows the location of a file or folder on your computer. It tells the program where to find or save files.

beginner

How do you combine parts of a file path safely in C#?

Use Path.Combine() method. It joins parts of a path with the correct separator for your system, avoiding errors.

beginner

What does Directory.CreateDirectory() do?

It creates a new folder (directory) at the specified path. If the folder already exists, it does nothing and does not throw an error.

beginner

How can you check if a file exists in C#?

Use File.Exists(path). It returns true if the file is there, otherwise false.

intermediate

What is the difference between Directory.GetFiles() and Directory.GetDirectories()?

Directory.GetFiles() returns a list of files in a folder. Directory.GetDirectories() returns a list of subfolders inside a folder.

Which method safely joins multiple parts of a file path in C#?

A Directory.Merge()

B String.Concat()

C File.Join()

D Path.Combine()

Path.Combine() joins path parts using the correct separator for the operating system.

What does Directory.CreateDirectory() do if the folder already exists?

A Does nothing and continues

B Deletes the folder

C Throws an error

D Renames the folder

It does nothing and does not throw an error if the folder exists.

How do you check if a file exists at a given path?

A Directory.Exists(path)

B File.Exists(path)

C File.Check(path)

D Path.Exists(path)

File.Exists(path) returns true if the file exists, false otherwise.

Which method lists all files inside a directory?

A Directory.GetDirectories()

B File.List()

C Directory.GetFiles()

D Path.GetFiles()

Directory.GetFiles() returns an array of file names in the directory.

What is the correct way to get the file name from a full path?

A Path.GetFileName()

B File.GetName()

C Directory.GetName()

D Path.GetDirectoryName()

Path.GetFileName() extracts the file name from a full file path.

Explain how to create a new directory and check if it exists in C#.

Think about methods to create and verify folders.

Describe how to safely build a file path from folder and file name parts.

Focus on combining path parts without errors.