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Property Pages

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Users can view and change project configuration-dependent and -independent properties using property pages. A Property Pages button is enabled in the Properties window or on Solution Explorer toolbar for objects that provide a property page view of the selected object. Property pages are created by the environment and are available for solutions and projects. They can, however, also be made available for project items that make use of configuration-dependent properties. This capability might be used when files within a project require different compiler switch settings to build properly.

Using Property Pages

If a property page is already displayed and the selection changes (for example, from a solution to a project), the information displayed in the pages changes to display the properties for the new selection. If there are no properties on the object that support property pages, the property page is empty.

If multiple objects are selected, the property page displays the intersection of properties for all selected items. If the selected item does not contain configuration-dependent properties and the Property Pages button on the Solution Explorer toolbar is clicked, focus changes to the Properties window. For more information relating to the Properties window and selection, see Extending Properties.

If properties are displayed for multiple objects and you change a value on a property page, all of the values for the objects are set to the new value even if they were initially different and the page was blank when an individual object's properties were displayed.

There are two general types of ProjectProperty Pages dialog boxes available in Visual Studio. In the first, for Visual Basic projects, for example, the property pages are displayed using a field format, as shown in the following screenshot. In the second, shown later in this section, the property page hosts a properties grid similar to that found in the Properties Window.

Visual Basic Property Pages

Project Property Pages dialog box with field format and tree structure

The tree structure in the Property Pages dialog box is not built using IVsHierarchy. The environment, based on the level name passed to it by the ISpecifyPropertyPages and the IVsPropertyPage interfaces, builds it.

There are only two top-level categories available on Visual Studio Property pages:

  • Common Properties, which displays configuration-independent information for the selected object or objects. As a result, when one of the Common Properties subcategories is selected, the Configuration, Platform, and Configuration Manager options across the top of the dialog box are not available.

  • Configuration Properties, which contains configuration-dependent information relating to Debugging, Optimization, and Build parameters for the solution or project.

    You cannot create any additional top-level categories, but you can choose not to display one or the other in your implementation of IVsPropertyPage. If, for example, you do not have any configuration-independent properties to display for an object, you can choose not to display the Common Properties category. You display Common properties if ISpecifyPropertyPages is implemented from the item's browse object and Configuration properties when you implement ISpecifyPropertyPages in the configuration object (the object implementing IVsCfg, IVsProjectCfg, and related interfaces).

    Each category displayed under a top-level category represents a separate property page. Category and subcategory entries available in the dialog box are determined by your implementation of ISpecifyPropertyPages and IVsPropertyPage.

    IDispatch objects for items in the selection container that have properties to be displayed on property pages implement ISpecifyPropertyPages to enumerate a list of class IDs. The class IDs are passed as variables to ISpecifyPropertyPages and are used to instantiate the property pages. The list of class IDs is also passed to IVsPropertyPage to create the tree structure on the left of the dialog box. The property pages then pass information back to the IDispatch object that implements ISpecifyPropertyPages and fills in the information for each page.

    The properties of the browse object are retrieved using IDispatch for each object in the selection container.

    Implementing Help::DisplayTopicFromF1Keyword in your VSPackage provides the functionality for the Help button.

    For further information, see IDispatch and ISpecifyPropertyPages in the MSDN library.

    The second type of property pages displayed in the samples hosts a form of the properties grid, as shown in the following screenshot.

    VC Property Pages

    Property Pages dialog box with properties grid

    The interfaces IVSMDPropertyBrowser and IVSMDPropertyGrid (declared in vsmanaged.h) are used to create and populate the properties grid within a dialog box or window.

    The architecture of projects has changed considerably from past versions of Visual Studio. In particular, the notion of which project is active has changed. In Visual Studio, there is no concept of an active project. In previous development environments, the active project was the project that build and deploy commands would default to regardless of the context. Now, the solution controls and arbitrates which build and deploy commands apply to which projects.

    What was previously an active project is now captured in one of three different ways:

  • The Startup project

    You can specify a project or projects from the solution's property page that will be started when the user presses F5 or selects Run from the Build menu. This works in a manner similar to the old active project in the sense that its name is displayed in Solution Explorer with bold font.

    You can retrieve the startup project as a property in the automation model by calling DTE.Solution.SolutionBuild.StartupProjects. In a VSPackage, you call the get_StartupProject or the get_StartupProject methods. IVsSolutionBuildManager is available as a service by QueryService on SID_SVsSolutionBuildManager. For more information, see Project Configuration Object and Solution Configuration.

  • Active solution build configuration

    Visual Studio has an active solution configuration, available in the automation model by implementing DTE.Solution.SolutionBuild.ActiveConfiguration. A solution configuration is a collection that contains one project configuration for each project in the solution (each project can have multiple configurations, on multiple platforms, with dissimilar names). For more information relating to the solution's property pages, see Solution Configuration.

  • Project currently selected

    Implement the GetCurrentSelection method to retrieve the project hierarchy and project item or items selected. From DTE, you would use the SelectedItems.SelectedItem.Project and SelectedItems.SelectedItem.ProjectItem methods. There is sample code under those headings in the core Visual Studio documents.

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