FileOrDirectoryExistsConstraint
FileOrDirectoryExistsConstraint is used to determine if a file or directory exists
            
                
If true, the constraint will only check if files exist, not directories
            
If true, the constraint will only check if directories exist, not files
            
public FileOrDirectoryExistsConstraint()
Initializes a new instance of the  FileOrDirectoryExistsConstraint class that
            will check files and directories.
            
Initializes a new instance of the  FileOrDirectoryExistsConstraint class that
            will only check files if ignoreDirectories is true.