Can a visitor to Canada apply for Canadian work permit/permanent residency?

Posted January 3rd, 2011 by immigratecanada and filed in Immigration to Canada

I was wondering if someone who goes to Canada on a visitors visa, finds a job in Canada and the employer offers a job letter, will that be enough for the Canadian immigration authorities to allow the individual to apply for a Work permit or Permanent Residency? Will he/she need to leave Canada to before applying for the Work Visa/Permanent Residency?