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CHA PTE R 5
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MODIFY THE CLASS NAMESPACE Action 7 Modify the entire MyPhotoAlbum namespace to exist within the Manning namespace
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Result The PhotoAlbum.cs file should now look as follows:
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using System; namespace Manning { namespace MyPhotoAlbum { /// <summary> /// Summary description for PhotoAlbum. /// </summary> public class PhotoAlbum { public PhotoAlbum() { // // TODO: Add Constructor Logic here // } } } }
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Enter the bolded text into the PhotoAlbum.cs file. When you type the final brace, Visual Studio will automatically reformat the lines as shown. Note: We have not made a similar change in the MyPhotos application since in this project the namespace is not likely to be used outside of the application itself.
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Our library is now ready; all we need to do is add code. One last task before we do this is to make certain we can use our library from within the MyPhotos application project. For this to work, the MyPhotos project must include a reference to the MyPhotoAlbum class. This corresponds to the /reference switch on the C# compiler (csc.exe) that we saw in chapter 1, and is a bit like linking a library into your program in C++. Since there are no header files in C#, a reference is all we need to start using classes from the library in our project.
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REFERENCE MYPHOTOALBUM FROM THE MYPHOTOS PROJECT Action 8 Display the Add Reference dialog box for the MyPhotos project.
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a. Click the MyPhotos project in the Solution Explorer window. b. Click on the Project menu. c. Select the Add Reference item.
Alternately
Right-click on the References entry under the MyPhotos project in the Solution Explorer window, and select Add Reference.
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REFERENCE MYPHOTOALBUM FROM THE MYPHOTOS PROJECT (continued) Action 9 Reference the MyPhotoAlbum project.
How-to
Result The MyPhotoAlbum assembly appears in Solution Explorer under the References entry for the MyPhotos project.
a. Click the Projects tab. b. Click the MyPhotoAlbum project. c. Click the Select button. d. Click OK to add the selected project.
It is important to realize that our new reference refers to the assembly produced by the MyPhotoAlbum project, and not the project itself. Visual Studio automatically uses the correct path when compiling the MyPhotos project to pick up the most recent MyPhotoAlbum library from the corresponding project. If you are not using Visual Studio .NET to build your program, you will need to establish the correct library location manually. The command-line tools discussed in chapter 1 are used for this purpose. The next section provides a short discussion on this topic. 5.2.2 USING THE COMMAND-LINE TOOLS As we saw in chapter 1, you can build Windows Forms applications without using Visual Studio .NET. The interactive environment makes a number of tasks easier, but also uses memory and other system resources. On a computer with limited resources, this can present some problems. If you have a favorite editor and are comfortable working with makefiles, you can create the examples in this book without using Visual Studio .NET. To create a class library such as MyPhotoAlbum.dll, create a MyPhotoAlbum directory for the library and place the required source files in it. In this case you would create a PhotoAlbum.cs file to hold the PhotoAlbum class source code, and create other files as required. You can create an AssemblyInfo.cs file as well, or simply include the version number and other assembly information at the top of your file as we did in chapter 1. The C# compiler (csc.exe) discussed in chapter 1 is used to produce both executables and libraries. The /target switch specifies the type of output file to produce.
CHA PTE R 5
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C# compiler output options (/target switch) Switch /target:exe /target:library /target:module Output Creates a console application (.exe). Creates a library file (.dll). Creates a library module (.dll). Comments This is the default. The library generated is an assembly that can be referenced by other .NET applications. This option does not produce an assembly manifest for the file. Such a file cannot be loaded by the .NET runtime until it is incorporated in an assembly manifest using the /addmodule switch. This permits collections of files to become a single assembly. When a Windows application is run in a console window, the console does not wait for the application to exit. This is different than a console application, where the console does in fact wait.
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