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The System.Drawing assembly appears in the References list for the MyPhotoAlbum project.
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a. Click the .NET tab. b. Locate and click the System.Drawing.dll item from the list. c. Click the Select button. d. Click the OK button. 11 Add a using directive for the System.Drawing namespace at the top of the file. The Photograph.cs file now contains two using directives:
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using System; using System.Drawing;
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Now the project should compile with no errors in Visual Studio .NET. If you are not using Visual Studio, multiple files can be included in the library by simply providing the list of files to the compiler. An example of how this might look is shown here.
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> csc /target:library /out:MyPhotoAlbum.dll PhotoAlbum.cs Photograph.cs /r:System.dll /r:System.Drawing.dll
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Before we deal with the possible exception that can occur in the Photograph.Image property, let s return to our PhotoAlbum class to make some initial use of the Photograph class.
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INTERFACES REVISITED
Back in our PhotoAlbum class, we are ready to implement the interfaces required. As you ll recall, an interface defines the set of required members, but does not provide any implementation. Supporting an interface requires that we define the class as supporting the interface, and include the required members for that interface within the class. For the PhotoAlbum class, the CollectionBase class defines itself as supporting the IEnumerable, ICollection, and IList interfaces. An implementation for the single method GetEnumerator required by the IEnumerable interface is provided by CollectionBase. As a result, we are left to implement the ICollection and IList interfaces. A list of ICollection members is provided in the following table:
PhotoAlbum members required for the ICollection interface Name Count IsSyncronized Properties SyncRoot Methods CopyTo Implementation Notes This property is provided by CollectionBase. For simplicity, we will not provide a synchronized interface for the PhotoAlbum class. As a result, this property will always return false.
The IList interface has a slightly longer list of members. Some of them are already provided by the CollectionBase class, but the bulk of them will be implemented using the protected CollectionBase.List property.
PhotoAlbum members required for the IList interface Name IsFixedSize Properties IsReadOnly Item Implementation Notes This method will always return false. This method will always return false. This property enables array-style indexing for our class.
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PhotoAlbum members required for the IList interface (continued) Name Add Clear Contains Methods IndexOf Insert Remove RemoveAt This method is provided by CollectionBase. This method is provided by CollectionBase. Implementation Notes
We will examine the implementation of these interfaces separately. 5.3.1 SUPPORTING THE ICOLLECTION INTERFACE The implementation of the ICollection members will use the protected List property from our base class, so let s get to it. We will make these and our IList members virtual to allow any subclass to override them as needed.
Set the version number for the application to 5.3. SUPPORT THE ICOLLECTION INTERFACE Action 1 2 Display the PhotoAlbum.cs file. Implement the IsSynchronized property.
public virtual bool IsSynchronized { get { return false; } } public virtual object SyncRoot { get { return List.SyncRoot; } } public virtual void CopyTo (Photograph[] array, int index) { List.CopyTo(array, index); }
Result
Implement the SyncRoot property.
Implement the CopyTo method.
Note: We require the array parameter to be an array of Photograph objects. The ICollection interface defines the CopyTo method as CopyTo(Array array, int index). Since a Photograph[] is also an Array, our declaration is an acceptable implementation even though it is more restrictive than the method defined by the interface.
SUPPORTING THE ILIST INTERFACE Our implementation for IList will be very similar in spirit to our implementation for ICollection. A key difference between the signatures of the IList members and
CHA PTE R 5
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our implementation is that we will use the Photograph class explicitly rather than the more generic object. Since a Photograph is still an object instance, a construct that requires an IList instance will still be able to use our PhotoAlbum object. This may seem a bit boring and tedious, but it needs to be done for a complete implementation. Note that C# does not support C++ style templates at this time, which would have been handy for implementing this and other interfaces.
SUPPORT THE ILIST INTERFACE Action 1 2 Display the PhotoAlbum.cs file. Implement the IsFixedSize property.
public virtual bool IsFixedSize { get { return false; } } public virtual bool IsReadOnly { get { return false; } } public virtual Photograph this[int index] { get { return (Photograph)(List[index]); } set { List[index] = value; } }
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