Should my method throw its own exception, or let .NET throw if a file doesn't exist?

Question

Here is my code:

public void ReadSomeFile(string filePath)
{
    if (!File.Exists(filePath))
        throw new FileNotFoundException();

    var stream = new         


        

Answer 1

Let the correct method try to open the file while you don't have any idea about full file name, somethings like special file names (eg. Device files and UNC paths):

In some cases other file methods may be failed, but opening the file is successful.

Some examples for special file names are:

• CON
• NUL
• COM1, COM2, COM3, COM4
• \\server\share\file_path
• \\teela\admin$\system32 (to reach C:\WINNT\system32)
• C:..\File.txt
• \\.\COM1
• %TEMP%
• and more...