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// Save the file, quit Excel and display message to user. workSheet.SaveAs(string.Format(@"{0}\Inventory.xlsx", Environment.CurrentDirectory)); excelApp.Quit(); MessageBox.Show("The Inventory.xslx file has been saved to your app folder", "Export complete!"); } This method begins by loading Excel into memory, however you won t see it visible on your computer desktop. For this application, you are only interested in using the internal Excel object model. However, if you do want to actually display the UI of Excel, update your method with this additional line of code: static void ExportToExcel(List<Car> carsInStock) { // Load up Excel, then make a new empty workbook. Excel.Application excelApp = new Excel.Application(); // Go ahead and make Excel visible on the computer. excelApp.Visible = true; ... } Once you create an empty worksheet, you add three columns which are named similar to the properties of the Car class. After this point, you fill the cells with the data of the List<Car>, and save your file under the (hard coded) name Inventory.xlsx. At this point if you run your application, add a few new records, and export your data to Excel, you will then be able to open up the Inventory.xlsx file, which will be saved to the \bin\Debug folder of your Windows Forms application. Figure 18-10 shows a possible export.

Now, if you were to select the Microsoft.Office.Interop.Excel.dll assembly (in Solution Explorer), and set its Embed Interop Type property to False, you would have new compiler errors, as the COM Variant data is no longer realized as dynamic data, but as System.Object variables. This will require you to update ExportToExcel() with a number of casting operations. As well, if this project were compiled under Visual Studio 2008, you no longer have the benefit of optional/named parameters, and must explicitly marked all missing arguments. Here is a version of the ExportToExcel() method which would be required in earlier versions of C#: static void ExportToExcel2008(List<Car> carsInStock) { Excel.Application excelApp = new Excel.Application(); // Must mark missing params! excelApp.Workbooks.Add(Type.Missing); // Must cast Object as _Worksheet! Excel._Worksheet workSheet = (Excel._Worksheet)excelApp.ActiveSheet; // Must cast each Object as Range object then call // call low level Value2 property! ((Excel.Range)excelApp.Cells[1, "A"]).Value2 = "Make"; ((Excel.Range)excelApp.Cells[1, "B"]).Value2 = "Color"; ((Excel.Range)excelApp.Cells[1, "C"]).Value2 = "Pet Name"; int row = 1; foreach (Car c in carsInStock) { row++; // Must cast each Object as Range and call low level Value2 prop! ((Excel.Range)workSheet.Cells[row, "A"]).Value2 = c.Make; ((Excel.Range)workSheet.Cells[row, "B"]).Value2 = c.Color; ((Excel.Range)workSheet.Cells[row, "C"]).Value2 = c.PetName; } // Must call get_Range method and then specify all missing args!. excelApp.get_Range("A1", Type.Missing).AutoFormat( Excel.XlRangeAutoFormat.xlRangeAutoFormatClassic2, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); // Must specify all missing optional args! workSheet.SaveAs(string.Format(@"{0}\Inventory.xlsx", Environment.CurrentDirectory), Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); excelApp.Quit(); MessageBox.Show("The Inventory.xslx file has been saved to your app folder", "Export complete!"); }

The simpletest_test_id table stores simpletest test IDs, used to auto-increment the test ID so that a fresh test ID is used. Table A-90. simpletest_test_id

While the end result is identical, as I am sure you agree, this version of the method is much more verbose. As well, since earlier versions of C# (prior to .NET 4.0, to be specific) don t allow you to embedd the COM interop data, you would find that your output directory now contains local copies of a number of interop assemblies, which you would be required to ship to the end user s machine (Figure 18-11).

Figure 18-11. Not embedding interop data requires you to ship standalone interoperability assemblies That wraps up our look at the C# dynamic keyword and the DLR. Hopefully you can see how these new .NET 4.0 features can simplify complex programming tasks, and (perhaps more importantly) understand the trade offs. When you opt into dynamic data, you do lose a good amount of type safety, and your code base is prone to many more runtime errors.

Unique simpletest ID used to group test results together; each time a set of tests are run, a new test ID is used. The last database prefix used during testing

Summary

The dynamic keyword of C# 4.0 allows you to define data whose true identity is not known until runtime. When processed by the new Dynamic Language Runtime (DLR), the automatically created expression

tree will be passed to the correct dynamic language binder, where the payload will be unpackaged and sent to the correct object member. Using dynamic data and the DLR, a number of complex C# programming tasks can be radically simplified, especially the act of incorporating COM libraries into your .NET applications. As you have also seen in this chapter, .NET 4.0 provides a number of further simplifications to COM interop (which have nothing to do with dynamic data) such as embedding COM interop data into your applications, optional arguments and named arguments. While these features can certainly simplify your code, always remember that dynamic data makes your C# code much less type safe, and open to runtime errors. Be sure you weigh the pros and cons of using dynamic data in your C# projects, and test accordingly!

test_id serial, auto increment last_prefix varchar(60)