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// Calc.cs using System; namespace CalculatorExample { // This class contains the app's entry point. public class CalcApp { static void Main() { Calc c = new Calc(); int ans = c.Add(10, 84); Console.WriteLine("10 + 84 is {0}.", ans); // Wait for user to press the Enter key before shutting down. Console.ReadLine(); } } // The C# calculator. public class Calc { public int Add(int x, int y) { return x + y; } } } Once the C# compiler (csc.exe) compiles this source code file, you end up with a single-file *.exe assembly that contains a manifest, CIL instructions, and metadata describing each aspect of the Calc and CalcApp classes. For example, if you were to open this assembly using ildasm.exe (examined a little later in this chapter), you would find that the Add() method is represented using CIL such as the following: .method public hidebysig instance int32 { // Code size 8 (0x8) .maxstack 2 .locals init ([0] int32 CS$1$0000) IL_0000: ldarg.1 IL_0001: ldarg.2 IL_0002: add IL_0003: stloc.0 IL_0004: br.s IL_0006 IL_0006: ldloc.0 IL_0007: ret } // end of method Calc::Add Add(int32 x, int32 y) cil managed

Don t worry if you are unable to make heads or tails of the resulting CIL for this method 15 will describe the basics of the CIL programming language. The point to concentrate on is that the C# compiler emits CIL, not platform-specific instructions. Now, recall that this is true of all .NET-aware compilers. To illustrate, assume you created this same application using Visual Basic .NET (VB .NET), rather than C#:

Now we run into the error that I mentioned in the previous example. Excel s CopyFromRecordset method doesn t like the data type of a field or fields that we re returning in the recordset being passed to it. A look at the Northwind 2007 Customers table in Design view (Figure 2-19) will show us the data types in use here.

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' Calc.vb Imports System Namespace CalculatorExample ' A VB .NET 'Module' is a class that only contains ' static members. Module CalcApp Sub Main() Dim ans As Integer Dim c As New Calc ans = c.Add(10, 84) Console.WriteLine("10 + 84 is {0}.", ans) Console.ReadLine() End Sub End Module Class Calc Public Function Add(ByVal x As Integer, ByVal y As Integer) As Integer Return x + y End Function End Class End Namespace If you examine the CIL for the Add() method, you find similar instructions (slightly tweaked by the VB .NET compiler): .method public instance int32 Add(int32 x, int32 y) cil managed { // Code size 9 (0x9) .maxstack 2 .locals init ([0] int32 Add) IL_0000: nop IL_0001: ldarg.1 IL_0002: ldarg.2 IL_0003: add.ovf IL_0004: stloc.0 IL_0005: br.s IL_0007 IL_0007: ldloc.0 IL_0008: ret } // end of method Calc::Add

At this point, you might be wondering exactly what is gained by compiling source code into CIL rather than directly to a specific instruction set. One benefit is language integration. As you have already seen, each .NET-aware compiler produces nearly identical CIL instructions. Therefore, all languages are able to interact within a well-defined binary arena. Furthermore, given that CIL is platform-agnostic, the .NET Framework itself is platform-agnostic, providing the same benefits Java developers have grown accustomed to (i.e., a single code base running on numerous operating systems). In fact, there is an international standard for the C# language, and a large subset of the .NET platform and implementations already exist for many non-Windows operating systems (more details at the conclusion of this chapter). In contrast to Java, however, .NET allows you to build applications using your language of choice.

agent understand which cells are related to one another. Again, this is especially helpful to screen readers and other assistive technology. It helps them read or display tables more logically. Our example table, with the scope attribute added, might look something like this: <table> <tr> <th scope="col">Name</th> <th scope="col">Affiliation</th> <th scope="col" abbr="URL">Website URL</th> </tr> <tr> <td scope="row">Jeff Croft</td> <td>World Online</td> <td>http://jeffcroft.com</td> </tr> <tr> <td scope="row">Ian Lloyd</td> <td>Accessify</td> <td>http://accessify.com</td> </tr> <tr> <td scope="row">Dan Rubin</td> <td>Webgraph</td> <td>http://superfluousbanter.org/</td> </tr> </table> Note that the element containing the names of individuals is marked up as a td, not a th, but is still assigned the scope attribute. Because our names are data values in this table and not simply generic labels, they should be table data cell elements rather than table header elements. However, they still provide context for the rest of the information in the row, so the addition of the scope attribute is appropriate.

To correctly define the parent class of MyDerivedClass, you must specify the full name of MyBaseClass as so: // Better! .namespace MyNamespace { .class public MyBaseClass {} .class public MyDerivedClass extends MyNamespace.MyBaseClass {} } In addition to the public and extends attributes, a CIL class definition may take numerous additional qualifiers that control the type s visibility, field layout, and so on. Table 15-3 illustrates some (but not all) of the attributes that may be used in conjunction with the .class directive. Table 15-3. Various Attributes Used in Conjunction with the .class Directive

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