Lazy-loading initialization examples

gistfile1.cs

/* Lazy Initialization example 1 */
private decimal? _calculatedNumber;

public decimal CalculatedNumber 
{
    get 
    {
    	if (!_calculatedNumber.HasValue) {
    		_calculatedNumber = this.CalculateNumber();
    	}

    	return _calculatedNumber.Value;
    }
}



/* Lazy Initialization example 2 - slimmed down */

private decimal? _calculatedNumber;
 
public decimal CalculatedNumber 
{
    get 
    {
    	return (_calculatedNumber = _calculatedNumber.HasValue ? _calculatedNumber.Value : this.CalculateNumber());
    }
}



/* Lazy Initialization example 3 - database call */

private User _currentUser;
private int _currentUserId;

public User CurrentUser
{
    get 
    {
        if (_currentUser == null) {
            _currentUser = db.Users.SingleOrDefault(u => u.UserId == _currentUserId);
        }
   		return  _currentUser;
    }
}