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To illustrate the use of these attributes (both of which are defined within the System.Runtime. Serialization namespace) let s update our previous CarOrderServiceLib project. After you open this project in Visual Studio 2005, set a reference to the System.Runtime.Serialization.dll assembly. Next, update your existing service contract (ICarOrder) to support the following new member (note that the parameter is a yet-to-be-defined custom class type): [ServiceContract(Namespace = "http://Intertech.com")] public interface ICarOrder { // Allows caller to place an order and obtain // an order ID. [OperationContract] int PlaceOrder(string make, string color, double price); // This version takes a CarOrderDetails object. [OperationContract] int PlaceOrder(CarOrderDetails order); // Allows caller to get current status of the order. [OperationContract] string CheckOrderStatus(int orderID); } The newly overloaded PlaceOrder() method takes a CarOrderDetails object as input, which defines four private member fields to represent the make, color, and price, as well as a CarOrderDetails type to represent a backup choice, just in case the first choice is not on the lot: [DataContract] public class CarOrderDetails { [DataMember] public string Make; [DataMember] public string Color; [DataMember] public double Price; [DataMember] public CarOrderDetails SecondChoice; } The CarOrderService type implements this overloaded method as follows: public int PlaceOrder(CarOrderDetails order) { // Greedy salesperson! if (order.SecondChoice.Price < 40000) { Console.WriteLine("Sorry, your first choice is not on our lot."); Console.WriteLine("We do however have a {0} {1}.", order.SecondChoice.Color, order.SecondChoice.Make);

The default PivotTable report Excel generates looks okay, but Excel 2007 does provide us with 75 different formatting options. To change the look of a PivotTable report using VBA code, use the PivotTable object s TableStyle2 property. This property is named TableStyle2 because there is already a TableStyle property (but it s not a member of the PivotTable object s properties go figure). Add a new subroutine to a standard code module and add the following code: Sub ApplyTableStyle() ActiveSheet.PivotTables("PivotTable1").TableStyle2 = "PivotStyleLight1" 'ActiveSheet.PivotTables("PivotTable1").TableStyle2 = "PivotStyleLight22" 'ActiveSheet.PivotTables("PivotTable1").TableStyle2 = "PivotStyleMedium23" End Sub Before we run this code, let s remove the Item Qty field from the Values list in the PivotTable Field List to make the PivotTable smaller and the formatting easier to see. Run the code from the Macros dialog box to apply the PivotStyleLight1 formatting to the PivotTable, as shown in Figure 6-24.

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Console.WriteLine("You will be charged {0}.", order.SecondChoice.Price); } else { // Simply print out the incoming data and return an order ID. Console.WriteLine("Thanks for buying a {0} {1} for the low, low price of ${2}.", order.Color, order.Make, order.Price); } return HardCodedOrderNumber; } At this point, compile your assembly to ensure you have no errors. Assuming this is the case, you might be surprised to see that when you load your CarOrderServiceHost project into Visual Studio 2005 (which automatically copies the latest version of CarOrderServiceLib.dll), you receive a runtime exception! The reason is that while method overloading is just fine as far as the CLR is concerned, the rules of WSDL demand that each method is uniquely named within the WCF contract. To disambiguate the name clash, we can set the Name property as so: [ServiceContract(Namespace = "http://Intertech.com")] public interface ICarOrder { ... // This version takes a CarOrderDetails object. [OperationContract(Name = "PlaceOrderWithDetails")] int PlaceOrder(CarOrderDetails order); } With this update, you should now be able to rebuild and execute your host.

The C# foreach keyword allows you to iterate over all items within an array, without the need to test for the array s upper limit. Here are two examples using foreach, one to traverse an array of strings and the other to traverse an array of integers: // Iterate array items using foreach. static void Main(string[] args) { string[] books = {"Complex Algorithms", "Do you Remember Classic COM ", "C# and the .NET Platform"}; foreach (string s in books) Console.WriteLine(s); int[] myInts = { 10, 20, 30, 40 }; foreach (int i in myInts) Console.WriteLine(i); } In addition to iterating over simple arrays, foreach is also able to iterate over system-supplied or user-defined collections. I ll hold off on the details until 7, as this aspect of the foreach keyword entails an understanding of interface-based programming and the role of the IEnumerator and IEnumerable interfaces.

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