Build Configurations

Prior to .NET, a Visual Basic project had only one set of properties. There was no way to have one set of properties for a debug build and a separate set for a release build. As a result, you had to manually change any environment-specific properties before you built the application. This has changed with the introduction of build configurations, which enable you to have different sets of project properties for debug and release builds.

Visual Studio does not limit you to only two build configurations. It's possible to create additional custom configurations. The properties that can be set for a project have been split into two groups: those that are independent of build configuration and therefore apply to all build configurations, and those that apply only to the active build configuration. For example, the Project Name and Project Location properties are the same irrespective of what build configuration is active, whereas the code optimization options vary according to the active build configuration.

The advantage of multiple configurations is that it's possible to turn off optimization while an application is in development and add symbolic debug information that helps locate and identify errors. When you are ready to ship the application, you can switch to the release configuration and create an executable that is optimized for production.

At the top of Figure 1-35 is a drop-down list box labeled Configuration. Typically, four options are listed in this box: the currently selected configuration, Active; the Debug and Release options; and a final option, All Configurations. When changes are made on this screen, they are applied only to the selected configuration(s). Thus, when Release is selected, any changes are applied only to the settings for the Release build. If, conversely, All Configurations is selected, then any changes made are applied to all of the configurations, Debug, and Release. Similarly, if Active is selected, then in the background the changes are made to the underlying configuration that is currently active.

FIGURE 1-35

Alongside this is a Platform drop-down. In the past it was recommended that you not change this, as it was set to Any CPU, which was an acceptable setting. However, with Visual Studio 2010 you'll want to consider this value, since in most cases it will default to x86. x86 represents 32-bit operating system environments and as a result, so if you are targeting a 64-bit environment you would want to change this value to be 64-bit. As mentioned earlier in this chapter, keep in mind that certain capabilities such as COM-Interop and Edit and Continue debugging are dependent on an x86 environment.

All of your compile settings are project-specific, but when you are working with a solution it is possible to have more than one project in the same solution. Although you are forced to manage these settings independently for each project, there is another form of project configuration related to multiple projects. You are most likely to use this when working with integrated Setup projects, where you might want to build only the Setup project when you are working on a release build.

To customize which projects are included in each build configuration, you need the Configuration Manager for the solution. Projects are assigned to build configurations through the Configuration Manager. You can access the Configuration Manager from the Build menu. Alternatively, the Configuration Manager can be opened using the drop-down list box to the right of the Run button on the Visual Studio toolbar. The Active Configuration drop-down box contains the following options: Debug, Release, and Configuration Manager. The first two default options are the currently available configurations. Selecting the bottom option, Configuration Manager, opens the dialog shown in Figure 1-36.

Configuration Manager

Active iututiuii pldlfurrri:

I Debug

Project contexts (check the project configurations to build or deploy):

Project

ProVB_VS2010

Configuration Debug

Platform

Build

FiGURE 1-36

The Configuration Manager contains an entry for each project in the current solution. You can include or exclude a project from the selected configuration by enabling or disabling the check box in the Build column of the grid. This is a valuable capability when a solution has multiple projects, as time isn't wasted waiting while a project that isn't being worked on is recompiled. The build configuration is commonly used when a Setup project is added to a solution. The normal plan is to rebuild only the Setup package when a release version of the actual application project is created. Note that regardless of the build configuration, you can build any assembly by right-clicking that project and selecting the Build option from the pop-up menu.

The Task List is a great productivity tool that tracks not only errors, but also pending changes and additions. It's also a good way for the Visual Studio environment to communicate information that the developer needs to know, such as any current errors. The Task List is displayed by selecting Task List from the View menu. It offers two views, Comments and User Tasks, and it displays either group of tasks based on the selection in the drop-down box that is part of this window.

The Comment option is used for tasks embedded in code comments. This is done by creating a standard comment with the apostrophe and then starting the comment with the Visual Studio keyword todo. The keyword can be followed with any text that describes what needs to be done. Once entered, the text of these comments shows up in the Task List. Note that users can create their own comment tokens in the options for Visual Studio via Tools O Options O Environment O Task List. Other predefined keywords include HACK and UNDONE.

Besides helping developers track these pending coding issues as tasks, leveraging comments embedded in code results in another benefit. Just as with errors, clicking a task in the Task List causes the Code Editor to jump to the location of the task without hunting through the code for it. Also of note, though we are not going to delve into it, the Task List is integrated with Team Foundation Server if you are using this for your collaboration and source control.

The second type of tasks is user tasks. These may not be related to a specific item within a single file. Examples are tasks associated with resolving a bug, or a new feature. It is possible to enter tasks into the Task List manually. Within the Task List is an image button showing a red check mark. Pressing this button creates a new task in the Task List, where you can edit the description of your new task.

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