ASP.NET Web PDF Document Viewer/Editor Control Library

That detects the problem, but what should we do if our particular turtle is not set up correctly Previously, we silently ignored the problem, and returned as though everything was just fine. Is that really what we want to do For this application it might be perfectly safe, but what if another developer uses our turtle with a paintbrush strapped to its back, to paint the lines on a tennis court The developer added a few extra moves at the beginning of his sequence, and he didn t notice that he had inadvertently done so before he initialized the PlatformWidth. We could have a squiggly paint disaster on our hands!

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public: SdiWindow( QWidget *parent = 0 ); protected: void closeEvent( QCloseEvent *event ); private slots: void fileNew(); void helpAbout(); void fileOpen(); bool fileSave(); bool fileSaveAs(); private: void createActions(); void createMenus(); void createToolbars(); bool isSafeToClose(); bool saveFile( const QString &filename ); void loadFile( const QString &filename ); QString currentFilename; QTextEdit *docWidget; QAction QAction QAction QAction QAction QAction *newAction; *openAction; *saveAction; *saveAsAction; *closeAction; *exitAction;

The System.Double type defines a number of constant values that are used to represent some very interesting doubles: Double.NaN is the result of dividing zero by zero (e.g., 0.0/0.0). Double.NegativeInfinity is the result of dividing a negative number by zero (e.g., 1.0/0.0). Double.PositiveInfinity is the result of dividing a positive number by zero (e.g., 1.0/0.0). They also behave in interesting ways. For example, you can t compare one of these special values with another (e.g., (0.0/0.0 != Double.NaN)). Instead, you have to use helper methods such as these: Double.IsNaN(0.0/0.0) Double.IsPositiveInfinity(1.0/0.0) Double.IsNegativeInfinity(-1.0/0.0) If you don t care whether it is a positive or a negative infinity, just some sort of infinity, you can use this helper: Double.IsInfinity(1.0/0.0). Be very careful when playing with infinities, as you can easily get into trouble!

Choosing when and how to fail is one of the big debates in software development. There is a lot of consensus about what we do, but things are much less clear-cut when it comes to failures.

If you don t have it already, download the wiki template add-in for Visual Studio NET from http://atlasaspnet Once you have installed this, you will be able to create the wiki application If you have this template installed, when you issue a File New command in Visual Studio NET, you will be presented with the New Web Site dialog box, and it will give you an option to create a Wiki ASP NET Atlas Web Site, as shown in Figure 7-8 This will create the entire wiki site for you Select a location, and click OK The example is pretty comprehensive Figure 7-9 shows the Solution Explorer for this site, and you can see that it contains a lot of good stuff, including master pages, templates, visual themes, back-end databases, controls, and of course web forms Remember, this is first and foremost an ASP .

You have a number of choices: 1. Try to plow on regardless. 2. Try to make sense of what has happened and work around it. 3. Return an error of some kind to your caller, and hope the caller knows what to do with it. 4. Stop. At the moment, we re using option 1: try to plow on regardless; and you can see that this might or might not be dangerous. The difficulty is that we can be sure it is safe only if we know why our client is calling us. Given that we can t possibly have knowledge of the continuum of all possible clients (and their clients, and their clients clients), plugging on regardless is, in general, not safe. We might be exposing ourselves to all sorts of security problems and data integrity issues of which we cannot be aware at this time. What about option 2 Well, that is really an extension of the contract: we re saying that particular types of data outside the range we previously defined are valid, it is just that we ll special-case them to other values. This is quite common with range properties, where we clamp values outside the range to the minimum and maximum permitted values. Example 6-5 shows how we could implement that.

class Turtle { // The width of the platform must be between 1.0 and 10.0 inclusive // Values outside this range will be coerced into the range. private double platformWidth; public double PlatformWidth { get { return platformWidth; } set { platformWidth = value; EnsurePlatformSize(); } } // The height of the platform must be between 1.0 and 10.0 inclusive // Values outside this range will be coerced into the range. private double platformHeight; public double PlatformHeight { get { return platformHeight; } set { platformHeight = value; EnsurePlatformSize(); } }