contract

 contract:

1. service contract:describe the funtional operation implemented by the service

• request -response operation contract
• one way operation contract
• duplex operation contract

   2. data contract: describe the data structures through which the service communicates. a data contract serializes clr types to xml and is strictly opt-in with their data members.

 

   3. message contract: work with typed and untyped data and provide precise control over the soap headers and bodies;

             

             using System; using System.ServiceModel; using System.Runtime.Serialization; using System.Collections.Generic; namespace EssentialWCF { [DataContract(Namespace = "http://EssentialWCF")] public class StockPrice { [DataMember] public double CurrentPrice; [DataMember] public DateTime CurrentTime; [DataMember] public string Ticker; } [CollectionDataContract] public class StockPriceCollection : List<StockPrice> { } [ServiceContract] public class StockService { [OperationContract] private StockPriceCollection GetPricesAsCollection(string[] tickers) { StockPriceCollection list = new StockPriceCollection(); for (int i = 0; i < tickers.GetUpperBound(0) + 1; i++) { StockPrice p = new StockPrice(); p.Ticker = tickers[i]; p.CurrentPrice = 94.85; p.CurrentTime = System.DateTime.Now; list.Add(p); } return list; } [OperationContract] private StockPrice[] GetPricesAsArray(string[] tickers) { int c = tickers.GetUpperBound(0); StockPrice[] s = new StockPrice[c + 1]; for (int i = 0; i < c + 1; i++) { StockPrice n = new StockPrice(); n.Ticker = tickers[i]; n.CurrentPrice = 94.85; n.CurrentTime = System.DateTime.Now; s[i] = n; } return s; } } } using System; using System.ServiceModel; using System.Collections; namespace Client { class Program { static void Main(string[] args) { using (ServiceReference1.StockServiceClient proxy = new ServiceReference1.StockServiceClient()) { string[] t = { "msft", "goog" }; ServiceReference1.StockPriceCollection sc = proxy.GetPricesAsCollection(t); foreach (ServiceReference1.StockPrice sp in sc) { Console.WriteLine("{0} at {1} is {2}", sp.Ticker, sp.CurrentTime, sp.CurrentPrice); } } } } }      

sing System; using System.ServiceModel; using System.Runtime.Serialization; namespace EssentialWCF { [Serializable] public class PriceDetails { public string Ticker; public double Amount; } [MessageContract] public class StockPrice { [MessageHeader] public DateTime CurrentTime; [MessageBodyMember] public PriceDetails Price; } [MessageContract] public class StockPriceReq { [MessageBodyMember] public string Ticker; } [ServiceContract] public interface IStockService { [OperationContract] StockPrice GetPrice(StockPriceReq req); } public class StockService : IStockService { public StockPrice GetPrice(StockPriceReq req) { StockPrice resp = new StockPrice(); resp.Price = new PriceDetails(); resp.Price.Ticker = req.Ticker; resp.Price.Amount = 94.85; resp.CurrentTime = System.DateTime.Now; return resp; } } } using System; using System.ServiceModel; namespace Client { class Program { static void Main(string[] args) { using (ServiceReference1.StockServiceClient proxy = new ServiceReference1.StockServiceClient()) { ServiceReference1.StockPriceReq req = new ServiceReference1.StockPriceReq(); req.Ticker = "MSFT"; ServiceReference1.StockPrice resp = proxy.GetPrice(req); Console.WriteLine("At {0}, {1}:{2}", resp.CurrentTime, resp.Price.Ticker, resp.Price.Amount); } } } }

     using System; using System.ServiceModel; using System.ServiceModel.Description; using System.Configuration; using System.Threading; using System.Messaging; namespace EssentialWCF { [ServiceContract] public interface IGoodStockService { [OperationContract] double GetStockPrice(string ticker); } [ServiceContract] public interface IGreatStockService { [OperationContract] double GetStockPriceFast(string ticker); } [ServiceContract] public interface IAllStockServices : IGoodStockService, IGreatStockService { }; public class AllStockServices : IAllStockServices { public double GetStockPrice(string ticker) { Thread.Sleep(5000); return 100.00; } public double GetStockPriceFast(string ticker) { return 100.00; } } public class program { // Host the service within this EXE console application. public static void Main() { using (ServiceHost serviceHost = new ServiceHost(typeof(AllStockServices))) { // Open the ServiceHostBase to create listeners and start listening for messages. serviceHost.Open(); Console.WriteLine("Service endpoints:"); ServiceDescription desc = serviceHost.Description; foreach (ServiceEndpoint endpoint in desc.Endpoints) { Console.WriteLine("Endpoint - address: {0}", endpoint.Address); Console.WriteLine(" binding: {0}", endpoint.Binding.Name); Console.WriteLine(" contract: {0}", endpoint.Contract.Name); } // The service can now be accessed. Console.WriteLine("The service is ready."); Console.WriteLine("Press <ENTER> to terminate./n/n"); Console.ReadLine(); // Close the ServiceHostBase to shutdown the service. serviceHost.Close(); } } } } sing System; using System.Collections; using System.ServiceModel; using System.Threading; namespace Client { class Program { static void Main(string[] args) { using (ServiceReference1.GoodStockServiceClient proxy = new ServiceReference1.GoodStockServiceClient("GoodStockService")) { Console.WriteLine(proxy.GetStockPrice("MSFT")); } using (ServiceReference1.GreatStockServiceClient proxy = new ServiceReference1.GreatStockServiceClient("BetterStockService")) { Console.WriteLine(proxy.GetStockPriceFast("MSFT")); } using (ServiceReference1.GreatStockServiceClient proxy = new ServiceReference1.GreatStockServiceClient("BestStockService")) { Console.WriteLine(proxy.GetStockPriceFast("MSFT")); } using (ServiceReference1.AllStockServicesClient proxy = new ServiceReference1.AllStockServicesClient("AllStockServices")) { Console.WriteLine(proxy.GetStockPriceFast("MSFT")); } } } }