SanitizeFilename

Sanitizes file and directory names in a manner that is compatible with Windows, Linux and OsX.

Implements rules documented by Microsoft + file name length truncation to 255 bytes - common on many modern file systems. Runs on any .net8 target platform.

Example

using Codeuctivity;

string unsafeString = "file*Name";
string safeFileName = unsafeString.SanitizeFilename();
Console.WriteLine($"Unsafe: {unsafeString}");
//Unsafe: file*Name
Console.WriteLine($"Sanitized: {safeFileName}");
//Sanitized: file_Name

string safeFileNameOptionalReplacementChar = unsafeString.SanitizeFilename(' ');
Console.WriteLine($"SafeFileNameOptionalReplacementChar: {safeFileNameOptionalReplacementChar}");
//SafeFileNameOptionalReplacementChar: file Name

Rules

Restrictions of Windows, Linux and OsX are alle combined to an replacement pattern, that will sanitize any filename to be compatible with any of the OS and common filesystem restrictions.

Pattern	OS that don't support pattern	OS that support pattern	Example
Reserved keywords	Windows	Linux, OsX	CON, PRN, AUX, ...
Reserved chars	Linux, Windows, OsX		'/', '\0'
Reserved chars windows	Windows	Linux, OsX	'\', '""', ...
Invalid trailing chars	Windows	Linux, OsX	' ', ','
Max length Linux	Linux,	Windows, OsX	255 bytes
Max length	Linux, Windows, OsX		255 chars
Unpaired Unicode surrogates	OsX, Linux	Windows	U+D800 - U+DFFF
NotAssigned to Unicode	OsX	Linux, Windows	U+67803, ...