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Some scripting languages are very liberal in their error-handling capabilities Some even allow scripters to trap and suppress syntax errors For good or bad, PowerShell will not allow us to do that Syntax and parse errors are impossible to trap here This feels like a good decision on the language designers part, as there is little value in being able to suppress a syntax error Almost all the time, a syntax error is a critical problem that needs fixing instead of suppressing or ignoring Parse errors should be easy to spot, right Most of the time, a parse error is a piece of illegal code like an unrecognized statement an unbalanced set of braces, brackets, or quotation marks There is one place where PowerShell stretches that definition a bit that needs mentioning parse-time optimizations The most common problem we can hit is literal expression evaluation.

From the screen displayed in Figure 19-21, you can configure your recovery catalog. Select the Use Recovery Catalog option. Next click the Add Recovery Catalog button to navigate to the screen displayed in Figure 19-22.

Now, despite what you may be thinking, the Graphics class is not directly creatable via the New keyword, as there are no publicly defined constructors. How, then, do you obtain a valid Graphics object Glad you asked.

Figure 19-22. Adding a recovery catalog Enter the details of your recovery catalog, and click Next. If all the information looks correct, click Finish to add the recovery catalog.

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The most common way to obtain a Graphics object is to interact with the Paint event. Recall from the previous chapter that the Control class defines a virtual method named OnPaint(). When you want a Form to render graphical data to its surface, you may override this method and extract a Graphics object from the incoming PaintEventArgs parameter. To illustrate, create a new Windows Forms application named BasicPaintForm, and update the Form-derived class as follows: Public Class MainForm Sub New() ' This call is required by the Windows Forms designer. InitializeComponent() ' Add any initialization after the InitializeComponent() call. CenterToScreen() End Sub Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs) ' If overriding OnPaint(), be sure to call base class implementation. MyBase.OnPaint(e) ' Obtain a Graphics object from the incoming ' PaintEventArgs. Dim g As Graphics = e.Graphics ' Render a textual message in a given font and color. g.DrawString("Hello GDI+", New Font("Times New Roman", 20), _ Brushes.Green, 0, 0) End Sub End Class While overriding OnPaint() is permissible, it is more common to handle the Paint event using the associated PaintEventHandler delegate (in fact, this is the default behavior taken by Visual Studio 2005 when handling events with the Properties window). This delegate can point to any method taking a System.Object as the first parameter and a PaintEventArgs as the second. Assuming you have handled the Paint event, you are once again able to extract a Graphics object from the incoming PaintEventArgs. Here is the update: Public Class MainForm Sub New() ' This call is required by the Windows Forms designer. InitializeComponent()

PowerShell tries to evaluate expressions like 3 + 4 at parse time This looks like a good optimization strategy, as it simplifies processing later on, but it has the shortcoming of not allowing us to trap any errors that occur during expression evaluation Here is a sample script, DivideByZerops1, that tries to trap a DivideByZeroException: trap { Write-Host "Caught $($_ExceptionGetType())" } Write-Host "Script start" 3 / 0 Running the code gives us the standard error message: PS> \DivideByZerops1 Attempted to divide by zero At z:\09 - Error Handling and Debugging\DivideByZerops1:6 char:4 + 3 / <<<< 0 Our trap has not triggered at all! As a matter of fact, no code has executed at all we would have seen our Script start message if it had PowerShell treats this situation as a parse error and just bails out.

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