Part IV in .NET

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Part IV
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Understanding Silverlight Frameworks
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7. Create a test class that creates an instance of the DataSocketServer class and then start it. 8. Add the test class as the Startup object in the Application tab of the new project properties.
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FIGURE 14.5 Silverlight application that uses sockets to request the time, date, or date/time strings from a service
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DataSocketServer.cs File That Opens a Socket and Writes a Format Request to a Windows Service That Periodically Writes
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using using using using using using System; System.Collections.Generic; System.Text; System.Net; System.Net.Sockets; System.IO;
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Using the Silverlight Communication Framework
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using System.Timers; using System.Threading; namespace SocketServer { public class DataSocketServer { TcpListener sListener = null; System.Timers.Timer sTimer = null; static ManualResetEvent sTcpClientConnect = new ManualResetEvent(false); List<StreamWriter> sClientStreams = new List<StreamWriter>(); string timeDateFormat; private void InitializeData() { timeDateFormat = Full ; } public void StartSocketServer() { InitializeData(); sTimer = new System.Timers.Timer(); sTimer.Enabled = false; sTimer.Interval = 1000; sTimer.Elapsed += new ElapsedEventHandler(doTimer); try { sListener = new TcpListener(IPAddress.Any, 4510); sListener.Start(); while (true) { sTcpClientConnect.Reset(); sListener.BeginAcceptTcpClient( new AsyncCallback(OnBeginAccept), null); sTcpClientConnect.WaitOne(); } } catch (Exception e) { } } private void OnBeginAccept(IAsyncResult result) {
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Part IV
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Understanding Silverlight Frameworks
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sTcpClientConnect.Set(); TcpListener listener = sListener; TcpClient client = listener.EndAcceptTcpClient(result); if (client.Connected) { char[] bytes = new char[5]; StreamReader reader = new StreamReader(client.GetStream()); int size = reader.ReadBlock(bytes,0,4); timeDateFormat = new String(bytes,0,4); StreamWriter writer = new StreamWriter(client.GetStream()); writer.AutoFlush = true; sClientStreams.Add(writer); SendData(); if (sTimer.Enabled == false) { sTimer.Start(); } } } public void StopSocketServer() { foreach (StreamWriter writer in sClientStreams) { writer.Dispose(); } sClientStreams.Clear(); sListener.Stop(); sListener = null; } private void doTimer(object sender, ElapsedEventArgs e) { SendData(); } private void SendData() { if (sClientStreams != null) { foreach (StreamWriter writer in sClientStreams) { if (writer != null) {
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Using the Silverlight Communication Framework
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string data; if (timeDateFormat == Date ) data = DateTime.Now.ToLongDateString(); else if(timeDateFormat == Time ) data = DateTime.Now.ToLongTimeString(); else data = DateTime.Now.ToString(); writer.Write(data); } } } } } }
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Using the HttpWebRequest and HttpWebResponse Objects
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The Silverlight communication framework also includes the HttpWebRequest and HttpWebResponse classes as part of the System.Net library. These classes provide a similar functionality to the WebClient class. In fact, the WebClient class implements the HttpWebRequest and HttpWebResponse classes behind the scenes. The WebClient class is much easier to use for simple communications. However, use the HttpWebRequest and HttpWebResponse classes if you need to send headers as part of the request or if you need more control over the Web service request.
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The HttpWebRequest class provides the functionality to create Web client requests and send them to Web services. The HttpWebRequest has no constructor, so to implement an HttpWebRequest you need to create an instance using the Create() function as shown in the following code. Create() accepts the Uri object specifying the Web service to connect to as its only argument:
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(new Uri(serviceUrl));
You can set the method and the ContentType header of the request using the Method and ContentType properties of the HttpWebRequestObject. The default method is GET. Table 14.6 lists the properties and methods associated with the HttpWebRequest class.
Part IV
Understanding Silverlight Frameworks
TABLE 14.6
Properties and Methods of the HttpWebRequest Class
Property/Method Description
Abort() BeginGetRequestStream() BeginGetResponse() ContentType Create() EndGetRequestStream() EndGetResponse() HaveResponse Headers Method
Cancels an outstanding HttpWebRequest. Starts an asynchronous request to get an IO stream that can be used to write data into the request. Starts an asynchronous request to an Internet resource. String. Specifies the ContentType header of the request. Creates an instance of the HttpWebRequest class. Finalizes the request for an IO stream and returns the Stream object. Finalizes the response to the request and returns an HttpWebResponse object. Boolean. Specifies whether there is a response associated with the request.
WebHeader collection. Specifies a collection of custom headers that will be included with the request.
String. Specifies the method of the request.
Uri. Specifies the URI of the request.
If you set the ContentType property of the HttpWebRequest object when the method is GET, an exception is thrown.
The BeginGetResponse() method of the HttpWebRequest sends the asynchronous request to the Web services. The BeginGetResponse() method accepts an AsyncCallback object as the first argument and the HttpWebRequestObject as the second. For example, the following code starts the request and specifies the responseHandler() function:
request.BeginGetResponse(new AsyncCallback(responseHandler), request);
The handler specified in the AsyncCallback object should accept an IAsyncResult object as an argument as shown in the following definition:
void responseHandler(IAsyncResult asyncResult)
When the Web request is completed, the handled request and response data are returned in the IAsyncResult argument to the AsyncCallback handler function.