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The dataSource parameter is assigned to the DataSource property of the control, while the dataMember parameter is assigned to the DataMember property. In our application, the control recognizes our PhotoAlbum object as an IList interface containing a collection of Photograph objects. This is performed internally using the GetType method available on all object instances. The properties of the Photograph object are determined internally using the members of the System.Reflection namespace. These properties are then used as the columns in the grid, and each Photograph in the album is presented as a row in the grid. We will not discuss the System.Reflection namespace in detail here. This namespace permits .NET objects such as the DataGrid control to determine the type of object and members of that type at runtime. In this way our data grid can understand how the PhotoAlbum object is organized, and automatically create an appropriate grid structure. Since the order of columns in the grid corresponds to the internal order of properties in the PhotoAlbum class, your columns might be ordered differently than is shown in figure 17.3. Also note that properties which only provide a get access method are treated as read-only, while properties with both a get and set access method are modifiable. As a result the Image and IsImageValid columns in our grid are read-only, while the Photographer and Notes columns can be modified. We will look at how to update the class with these changes shortly. DATA GRIDS 571

Although the Standard Template Library is large and its syntax is, at times, rather intimidating, it is actually quite easy to use once you understand how it is constructed and what elements it employs Therefore, before looking at any code examples, an overview of the STL is warranted At the core of the Standard Template Library are three foundational items: containers, algorithms, and iterators These items work in conjunction with one another to provide off-the-shelf solutions to a variety of programming problems

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Back to our SetDataBinding method, there are a number of different classes that can serve as a source of data, depending on the type of C# interfaces they support. A summary of data sources for the DataGrid class is given in the following table.

Containers are objects that hold other objects There are several different types of containers For example, the vector class defines a dynamic array, deque creates a double-ended queue, and list provides a linear list These containers are called

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A homogenous collection of objects. The This includes any simple array in C#, first item in the list determines the type. and all classes based on the Array The first property in that type is object. displayed as the only column when bound to a data grid. A typed collection, such as our PhotoAlbum class. The type returned by the Item property is used as the assigned type, and all properties in this type can be displayed in a data grid. These can be bound to a data grid only at run time. With both interfaces available, the class may appear in Visual Studio .NET in the component tray and be bound to a data grid at design time. Most notably, classes derived from

his chapter explores what is considered by many to be the most important new feature added to C++ in recent years: the Standard Template Library The inclusion of the standard template library, or STL, was one of the major efforts that took place during the standardization of C++ The STL provides general-purpose, templatized classes and functions that implement many popular and commonly used algorithms and data structures For example, it includes support for vectors, lists, queues, and stacks It also defines various routines that access them Because the STL is constructed from template classes, the algorithms and data structures can be applied to nearly any type of data The STL is a complex piece of software engineering that uses some of C++ s most sophisticated features To understand and use the STL, you must have a complete understanding of the C++ language, including pointers, references, and templates Frankly, the template syntax that describes the STL can seem quite intimidating although it looks more complicated than it actually is While there is nothing in this chapter that is any more difficult than the material in the rest of this book, don t be surprised or dismayed if you find the STL confusing at first Just be patient, study the examples, and don t let the unfamiliar syntax override the STL s basic simplicity The purpose of this chapter is to present an overview of the STL, including its design philosophy, organization, and constituents, along with the programming techniques needed to use it Because the STL is a large library, it is not possible to discuss all of its features here This chapter also describes one of C++ s most important classes: string The string class defines a string data type that allows you to work with character strings much as you do with other data types: using operators The string class is closely related to the STL, so it makes sense to discuss both in this chapter.

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