Does an IO exception in .NET get thrown if the file system is full??

Question

As above but doesnt windows buffer the file system?? Does this mean that when you write this could work but later when flushed it throws an exception....

Have I got this right

Answer 1

You could check the Win 32 Exception after what you have fails to see if that gives more detail:

     Win32Exception ex = new Win32Exception();
     string low_level_error = ex.Message;

How are you writing to disk? For FileStream it says:

"Be sure to call the Dispose method on all FileStream objects, especially in environments with limited disk space. Performing IO operations can raise an exception if there is no disk space available and the Dispose method is not called before the FileStream is finalized."

Answer 2

You will get an IO exception:

System.IO.IOException: There is not enough space on the disk.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

The System.IO library handles the actual tasks of reading and writing to disk and wraps them in managed code, so you shouldn't get any unmanaged exceptions using them.

It's also worth trying this (with one of those shoddy small USB sticks they give out everywhere) to see what happens with your code - that's usually the best way of finding out this sort of thing.