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Now that you can explicitly convert Rectangles into Squares, let s examine a few additional explicit conversions. Given that a square is symmetrical on all sides, it might be helpful to provide an explicit conversion routine that allows the caller to cast from an integer type into a Square (which, of course, will have a side length equal to the incoming integer). Likewise, what if you were to update Square such that the caller can cast from a Square into a System.Int32 Here is the calling logic: static void Main(string[] args) { ... // Converting an int to a Square. Square sq2 = (Square)90; Console.WriteLine("sq2 = {0}", sq2); // Converting a Square to a int. int side = (int)sq2; Console.WriteLine("Side length of sq2 = {0}", side); Console.ReadLine(); } and here is the update to the Square class: public class Square { ... public static explicit operator Square(int sideLength) { Square newSq = new Square(); newSq.Length = sideLength; return newSq; } public static explicit operator int (Square s) {return s.Length;} } To be honest, converting from a Square into an integer may not be the most intuitive (or useful) operation. However, it does point out a very important fact regarding custom conversion routines: the compiler does not care what you convert to or from, as long as you have written syntactically correct code. Thus, as with overloading operators, just because you can create an explicit cast operation for a given type does not mean you should. Typically, this technique will be most helpful when you re creating .NET structure types, given that they are unable to participate in classical inheritance (where casting comes for free).

<includeDate>true</includeDate> <includeTime>false</includeTime> <includeLevel>true</includeLevel> <includeCategory>true</includeCategory> </properties> <filters> <pattern>Endpoint.*</pattern> <pattern>Service.*</pattern> <pattern>Message.*</pattern> <pattern>DataService.*</pattern> <pattern>Configuration</pattern> </filters> </target> </logging> <system> <redeploy> <enabled>true</enabled> <watch-interval>20</watch-interval> <watch-file> {context.root}/WEB-INF/flex/flex-services.xml </watch-file> <watch-file> {context.root}/WEB-INF/flex/flex-config.xml </watch-file> <watch-file> {context.root}/WEB-INF/flex/flex-messages-config.xml </watch-file> <touch-file>{context.root}/WEB-INF/web.xml</touch-file> </redeploy> </system> </services-config>

Although the prime purpose of a GridView is to show a set of records, you can also add some more interesting information, such as summary data. The first step is to add the footer row by setting the GridView.ShowFooter property to True. This displays a shaded footer row (which you can customize freely), but it doesn t show any data. To take care of that task, you need insert the content into the GridView.FooterRow. For example, imagine you re dealing with a list of products. A simple summary row could display the total or average product price. In the next example, the summary row displays the total value of all the in-stock products.

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Thus far, you have created various custom explicit conversion operations. However, what about the following implicit conversion static void Main(string[] args)

The first step is to decide when to calculate this information If you re using manual binding, you could retrieve the data object and use it to perform your calculations before binding it to the GridView However, if you re using declarative binding, you need another technique You have two basic options you can retrieve the data from the data object before the grid is bound, or you can retrieve it from the grid itself after the grid has been bound The following example uses the latter approach because it gives you the freedom to use the same calculation code no matter what data source was used to populate the control It also gives you the ability to total just the records that are displayed on the current page, if you ve enabled paging.

{ ... // Attempt to make an implicit cast Square s3 = new Square(); s3.Length = 83; Rectangle rect2 = s3; Console.ReadLine(); } This code will not compile, given that you have not provided an implicit conversion routine for the Rectangle type. Now here is the catch: it is illegal to define explicit and implicit conversion functions on the same type if they do not differ by their return type or parameter set. This might seem like a limitation; however, the second catch is that when a type defines an implicit conversion routine, it is legal for the caller to make use of the explicit cast syntax! Confused To clear things up, let s add an implicit conversion routine to the Rectangle structure using the C# implicit keyword (note that the following code assumes the width of the resulting Rectangle is computed by multiplying the side of the Square by 2): public class Rectangle { ... public static implicit operator Rectangle(Square s) { Rectangle r = new Rectangle(); r.Height = s.Length; // Assume the length of the new Rectangle with // (Length x 2) r.Width = s.Length * 2; return r; } } With this update, you are now able to convert between types as follows: static void Main(string[] args) { ... // Implicit cast OK! Square s3 = new Square(); s3.Length= 7; Rectangle rect2 = s3; Console.WriteLine("rect2 = {0}", rect2); DrawSquare(s3); // Explicit cast syntax still OK! Square s4 = new Square(); s4.Length = 3; Rectangle rect3 = (Rectangle)s4; Console.WriteLine("rect3 = {0}", rect3); Console.ReadLine(); }

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