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Table 13-2 RuntimeWrappedException Properties
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Name Data HelpLink InnerException Message Source StackTrace
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Description Gets a collection of key/value pairs that provide additional, user-defined information about the exception Gets or sets a link to the help file associated with this exception Gets the Exception instance that caused the current exception Gets a message that describes the current exception Gets or sets the name of the application or object that caused the error Gets a string representation of the frames on the call stack at the time the current exception was thrown
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Lesson 1: Using COM Objects
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Table 13-2 RuntimeWrappedException Properties
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Name TargetSite WrappedException
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Description Gets the method that throws the current exception Gets the object that was wrapped by the RuntimeWrappedException object
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With the exception (no pun intended) of WrappedException, each of these properties is inherited from the System.Exception class. So the main distinction is the WrappedException property, which is of type Object. Why does all this matter Under the .NET Framework 2.0, when a non-CLS-compliant exception is thrown, the common language runtime (CLR) creates an instance of this class and then sets the WrappedException property to the object that was thrown. This behavior is handled by default and is transparent to the developer, but it s important to be aware of. The following code illustrates this behavior.
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' VB Private Sub IllustrateExceptions() Try ' Something that throws an exception Catch ex As Exception ' In the previous versions this will catch only CLS-Compliant ' In the current version both CLS and Non CLS-Compliant will ' be caught by this block. End Try ' There is no equivalent for Catch without an exception ' because it's considered unreachable. End Sub // C# private static void IllustrateExceptions() { try { // Something that throws an exception } catch (Exception ex) { // In the previous versions this will catch only CLS-Compliant // In the current version both CLS and Non CLS-Compliant will // be caught by this block. } catch { // All exceptions, CLS-Compliant and Non CLS-Compliant are caught } }
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13
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Interoperation
To turn off this behavior, you can use the RuntimeCompatibility attribute, as illustrated here:
' VB Imports System.Runtime.CompilerServices [assembly: RuntimeCompatibility(WrapNonExceptionThrows=false)] // C# using System.Runtime.CompilerServices; [assembly: RuntimeCompatibility(WrapNonExceptionThrows=false)]
MORE INFO
Exception management
Exception management in COM Interop applications is discussed further in the Exception Handling in Managed Code section of Lesson 3.
Limitations of COM Interop
Since the advent of .NET, there have been some shortcomings with using COM Interop, and they are largely related to inherent differences (improvements, in my opinion) that .NET has compared to previous development methodologies. Following is a list of these shortcomings:
Static/shared members COM objects are fundamentally different from .NET
types. One of the differences is lack of support for static/shared members.
Parameterized constructors COM types don t allow parameters to be passed into
a constructor. This limits the control you have over initialization and the use of overloaded constructors.
Inheritance One of the biggest issues is the limitations COM objects place on the inheritance chain. Members that shadow members in a base class aren t recognizable, and therefore, aren t callable or usable in any real sense. Portability Operating systems other than Windows don t have a registry. Reli-
ance on the Windows registry limits the number of environments a .NET application can be ported to.
Lab: Use a COM Application from .NET
In this lab, you create an application that consumes an Adobe Acrobat 7.0 Browser Document COM component (or any other component that you prefer). If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
Lesson 1: Using COM Objects
1. Open Visual Studio 2005, and create a new C# or Visual Basic 2005 Winforms application. 2. Name the project TypeDemoCS or TypeDemoVB, depending on which language you choose to write in. 3. From the main menu, select Tools, Choose Toolbox Items. A dialog box appears that has two tabs: .NET Framework Components and COM Components. On the COM Components tab, select the Adobe Acrobat 7.0 Browser Document item and click OK. 4. Select Form1.cs if you re using C# or Form1.vb if you re using Visual Basic and drag a new Adobe Acrobat 7.0 Browser Component onto the form. By default, this component will be named axAcroPDF1. 5. Double-click Form1.cs or Form1.vb to automatically register the Load event for the form and go to the code window. Add the following code to the Form_Load event.:
' VB AxAcroPDF1.LoadFile("SamplePDFDocument.pdf") AxAcroPDF1.Print() // C# axAcroPDF1.LoadFile(@"SamplePDFDocument.pdf"); axAcroPDF1.Print();
6. Build the project, and resolve any errors. If everything works correctly, a window similar to the one shown in Figure 13-2 will appear and you can print the PDF document.
Figure 13-2
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