qr code generator asp net c# BEST PRACTICES Avoiding optional parameters in C#.NET

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BEST PRACTICES Avoiding optional parameters
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There are many reasons to avoid Visual Basic s optional parameter feature, although this is an area that s frequently disputed. The primary reason to avoid them, in my opinion, is that they aren t supported in all .NET languages. Developers who didn t know Visual Basic and were trying to translate the code would have a difficult time they d wonder why something worked in one context and not the other. Similarly, many argue that optional parameters are remnants of the previous non.NET Visual Basic and, as such, should be avoided.
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Interoperation
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Here is an example of using the Type.Missing field:
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' VB Module Module1 Private OptionalParamHandler As Object = Type.Missing Sub Main() Dim NewExcelApp As New Microsoft.Office.Interop.Excel.Application NewExcelApp.Worksheets.Add(OptionalParamHandler, _ OptionalParamHandler, OptionalParamHandler, _ OptionalParamHandler) End Sub End Module // C# class Program { private static Object OptionalParamHandler = Type.Missing; static void Main(string[] args) { Application NewExcelApp = new Application(); NewExcelApp.Worksheets.Add(ref OptionalParamHandler, ref OptionalParamHandler, ref OptionalParamHandler, ref OptionalParamHandler); } }
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This approach accomplishes two things: it allows the code to work in C#, and it makes the code more intelligible. (No one will have to guess why you created objects that never get used for any apparent reason.)
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Tools Used by COM Interop
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Both the .NET Framework 2.0 and Visual Studio 2005 provide multiple tools that are used by COM Interop. The .NET tools and their uses are explained in Table 13-1.
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Table 13-1 Tools for Managing COM Interop from .NET
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Name Type Library Importer Type Library Exporter
Description Imports a new .NET assembly based on the COM component Creates a COM type library that can be consumed by a .NET application
Application Name TlbImp.exe TlbExp.exe
Lesson 1: Using COM Objects
Table 13-1 Tools for Managing COM Interop from .NET
Name Registry Editor
Description All COM components must have an entry in the Windows registry. Although not exclusive to COM Interop, the Registry Editor allows you to search for and manage existing registry entries. Although not exclusive to COM Interop, this tool enables you to view a visual representation of the Intermediate Language (IL). Enables you to add .NET assemblies to and remove .NET assemblies from the system registration database.
Application Name Regedit.exe
Intermediate Language Disassembler Assembly Registration Tool
Ildasm.exe
Regasm.exe
NOTE Portability
Platforms other than Windows that the .NET Framework has been ported to (such as Linux and Macintosh) do not have a Registry. These tools are available only with Windows.
Using COM Objects in Code
After the steps in the Importing Type Libraries section have been performed, using an object contained in a given library is virtually identical to using one created purely in .NET. In the following example, the Adobe Acrobat Reader 7.0 Browser Document COM component will be used to open and read a .pdf file. If you don t have Adobe Acrobat Reader 7.0 installed, it s available for free at http://www.adobe.com/products/ acrobat/readstep2_allversions.html. For the sake of simplicity, add the Adobe Acrobat 7.0 Browser Document component to your toolbox and drag the component onto a Windows form. (Detailed instructions for how to do this are provided in the Lab section at the end of this lesson.)
' VB AxAcroPDF1.LoadFile("SamplePDFDocument.pdf") AxAcroPDF1.Print() // C# axAcroPDF1.LoadFile(@"SamplePDFDocument.pdf"); axAcroPDF1.Print();
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Interoperation
This might seem surprisingly easy. It certainly did to me when I first encountered it. And after a type is imported, that s all there is to it. At first glance, it might not seem obvious why that is. However, think about what happens when a DLL is imported. A new .NET assembly is created from it. From your code s perspective, there s no notion of where the code originated, so it makes perfect sense that the behavior would seem identical.
Handling Exceptions in COM Interop
Dealing with exceptions is one area that has changed drastically (albeit transparently in many instances) with regard to consuming COM objects in .NET 2.0. In prior versions of the Framework, System.Exception sat at the top of the Exception object hierarchy chain. This meant that that trapping a System.Exception object would catch anything wrong in an application. Well, not exactly. Although this is a widely held belief, it s a misconception. What System.Exception would handle is any Common Language Specification (CLS)-compliant exception. Because your COM errors won t be CLS compliant, they won t be caught. Because so many developers mistakenly understood the behavior of trapping System.Exception, quite a bit of unstable code and code with serious potential security implications was developed. In version 2.0 of the .NET Framework, the RuntimeWrappedException class was introduced into the System.Runtime.CompilerServices namespace. Table 13-2 lists the properties of the RuntimeWrappedException, from the MSDN documentation.
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