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You ve just seen how to use the IEnumerable and IEnumerator interfaces to create useful enumerables and enumerators. But there are several drawbacks to this method. First, remember that the object returned by Current is of type object. For value types, this means that before they are returned by Current, they must be boxed to turn them into objects. They must then be unboxed again after they have been received from Current. This can exact a substantial performance penalty if it needs to be done on large amounts of data. Another drawback of the non-generic interface method is that you ve lost type safety. The values being enumerated are being handled as objects, and so can be of any type. This eliminates the safety of compile-time type checking. You can solve these problems by making the following changes to the enumerator/ enumerable class declarations. For the enumerator class Do not derive the class from IEnumerator. Implement MoveNext just as before. Implement Current just as before, but have as its return type the type of the items being enumerated. You do not have to implement Reset. For the enumerable class Do not derive the class from IEnumerable. Implement GetEnumerator as before, but have its return type be the type of the enumerator class.

It s time to check whether everything is working fine. The OcTreeNode class contains a variable modelsDrawn, which is static, meaning that it is the same for all nodes of your quadtree. It is increased in the Draw method only if a model is actually drawn. It is a private variable, so you cannot yet access it from outside the octree. You could change it to public, but here you can find another example of a getter+setter method, which can be added your OcTreeNode class: public int ModelsDrawn { get { return modelsDrawn; } set { modelsDrawn = value; } } During the drawing phase of your program, you will want to set this value to 0 before you draw the octree. When the rendering of the octree has been completed, this variable will hold the number of models actually drawn to the screen, so you can output it, for example, to the title bar of the window: ocTreeRoot.ModelsDrawn = 0; BoundingFrustum cameraFrustrum = new BoundingFrustum(fpsCam.ViewMatrix * fpsCam.ProjectionMatrix); ocTreeRoot.Draw(fpsCam.ViewMatrix, fpsCam.ProjectionMatrix, cameraFrustrum); Window.Title = string.Format("Models drawn: {0}", ocTreeRoot.ModelsDrawn); When a cube containing a model leaves the sight of the camera, you ll see the number of models drawn decreasing.

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Figure 3-21. Design of the Projects table The Id column is set up as the primary key, and it s of type uniqueidentifier, which is a Guid type in .NET. There are many ways to create primary key columns in tables, including using auto-incrementing numeric values or user-assigned values. However, the use of a uniqueidentifier is particularly powerful when working with object-oriented designs. Other techniques don t assign the identifier until the data is added to the database, or they allow the user to provide the value, which means that you can t tell if it collides with an existing key value until the data is added to the database. With a uniqueidentifier, however, the business developer can write code to assign the primary key value to an object as the object is created. There s no need to wait until the object is inserted into the database to get or confirm the value. If the value isn t assigned ahead of time, the database will supply the value. Notice that the two datetime fields allow Null values. The Null value is used here to indicate an empty value for a date. The Description column is also allowed to be Null. This isn t because of any business requirement but rather because it is quite common for database columns to allow Null values in cases in which they re meaningless. 18 will illustrate how to easily ignore any Null values in this column. The Description column is of type varchar(MAX) so that it can hold a blob of text data. This field allows the user to enter a lengthy description of the project, if so desired.

Delete(string) Encrypt(string) Decrypt(string) Exists(string) GetCreationTime(string) GetLastAccessTime(string) GetLastWriteTime(string) Move(string, string)

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