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The program is exclusively for educational purposes of this chapter. It doesn't do anything interesting except teach debugging.
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Using a DLL in an Application
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When you design an application, you usually have more than one component. In many cases, the components are new classes (types). It is good practice to have those types in a separate source code file instead of keeping them with the user interface code. Often, the classes are grouped in a single library or DLL. When you want to use a type from a library, you need to make your application aware of all the types and methods contained in that library by adding a reference to it in the application.
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Adding a Reference to Your Application
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To add new references to your application, follow the steps here.
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TO ADD A REFERENCE TO YOUR APPLICATION 1 Select the project where you want to add the reference; in this case, select Debugger. 2 make sure you re at the right place.
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Right-click the project name (i.e., Debugger) and then select Add Reference.... Look at Figure 7-1 to
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As you can see from the tabs on the dialog box that appears, the references can come from multiple sources.
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3 project, which contains the managed DLL. Press OK to
add the reference to your project.
Select the Projects tab and then select the MyLibrary
Because the DLL is in the same solution and you just added a reference of that DLL to your application, Microsoft Visual Studio now knows there is a dependency between the two and will always build the DLL first so that your application builds the exec utable with the most up-to-date DLL possible. You can verify that the reference has been inserted using the following technique. In the Solution Explorer expand the References node and look for the MyLibrary reference. Click on it to see the details in the Property window. By default, when you create a Windows Form project plenty of references are automatically added to the project during its creation. Figure 7-2 shows the references and Property window for information pertinent to MyLibrary.
Figure 7-2 All references for this project.
Figure 7-1 Add Reference. . . menu choice from the Debugger project
7: Fixing the Broken Blocks
NOTE
A using directive does not give you access to any namespaces that are nested in the namespace you specify.
When you're done adding the reference, your application can create instances of the new types that are built in the DLL and use them appropriately. The build process (compiler and linker) will now accept the use of those new types, but for Visual Studio to have those new types available via IntelliSense and for the compiler to know about those new types, one more step is required. You might already have seen the first line of code in the TestApplication.cs file. The line reads using MyLibrary;. You create a using directive to use the types in a namespace without having to specify the fully qualified namespace name. For instance, Console.WriteLine() comes from the System namespace; by adding it on top, you don t have to type System.Console.WriteLine(). It saves time and it s easier to read. By adding this line of code, you re telling Visual Studio to look into that assembly for the metadata that will enable IntelliSense to be populated with the public/protected elements. After adding this line, you ll have access to those items whenever you have an instance of one of the types built in the library.
Breakpoints, Locals, Edit and Continue, and Visualizers
If the breakpoints don't appear, you can add them by clicking in the left margin.
There is no better way to dive into this subject than by looking at and going through the code. If the TestApplication.cs source code file is not already open, open it by right-clicking on the TestApplication.cs file and selecting View Code. You should see red dots on the lefthand side of the screen; those red dots are breakpoints. Figure 7-3 shows the source code and the breakpoints.
Figure 7-3 Source code and breakpoints from the TestApplication Windows form
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When the debugger encounters a breakpoint, it stops executing the application. In this source code, one of the breakpoints is on the call to the MessageBox.Show(myString);. There is another breakpoint in the Library.cs in the first line of code of the Divide method. In the following procedure, you will execute the code and go through a debugging session. To debug an application, you can do one of two things: Press F5 or the Start Debugging button. The program will start executing normally. If there is a breakpoint in the source code, the execution will stop there. Otherwise, the program will continue to execute unless there is an unhandled exception, or error. Alternatively, you can debug the application by stepping through the code line by line. To do this, press F11 or the Step Into button. For now, you ll jump to the first breakpoint and execute the code in the sample program using the first technique.
TO BEGIN DEBUGGING AN APPLICATION 1 Press F5 or the Start Debugging button. 2 in the Divide method, and you should see what is shown in Figure 7-4. The yellow highlighted line
means it is the next statement to be executed. You will see a button that says Try Me! Click it. The code should stop executing at the first breakpoint
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