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CHAPTER 21 NETWORKING & WCF
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static void Main(string[] args) { // create a new WebClient object WebClient myWebClient = new WebClient(); // set a base address myWebClient.BaseAddress = "http://www.microsoft.com"; // download a URL to a byte array byte[] byteData = myWebClient.DownloadData("en/us/default.aspx"); // print out the first few byte values Console.WriteLine("--- Byte Data ---"); for (int i = 0; i < 20 && i < byteData.Length; i++) { Console.Write("{0},", byteData[i]); } Console.WriteLine(); // download the data to a string string dataString = myWebClient.DownloadString("en/us/default.aspx"); // print the first few characters of the string Console.WriteLine("--- String Data ---"); Console.WriteLine(dataString.Substring(0, 80)); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 21-3 retrieves the data from the same URL using the DownloadData and DownloadString methods. The DownloadData method is most useful when you are expecting binary data, and the DownloadString method is most useful when you are expecting text. Compiling and running Listing 21-3 produces the following results: --- Byte Data --239,187,191,60,33,68,79,67,84,89,80,69,32,104,116,109,108,32,80,85, --- String Data --<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.or Press enter to finish
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The WebClient class includes a property called ResponseHeaders that provides access to the headers included by the server in the response to your request. This property returns a System.Collections.Specialized.NameValueCollection object; this is the same type you use when using the Headers and QueryString properties. Listing 21-4 demonstrates how to use the ResponseHeaders property.
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CHAPTER 21 NETWORKING & WCF
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Listing 21-4. Using the WebClient.ResponseHeaders Property using System; using System.Collections.Specialized; using System.Net; class Listing 04 { static void Main(string[] args) { // create a new WebClient object WebClient myWebClient = new WebClient(); // download a URL as a string string dataString = myWebClient.DownloadString("http://www.microsoft.com"); // get the headers NameValueCollection headers = myWebClient.ResponseHeaders; foreach (string key in headers.AllKeys) { Console.WriteLine("Header: {0}, Value: {1}", key, headers[key]); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } You get the set of headers from the NameValueCollection object using the AllKeys property. This returns a string array that you use in a foreach loop to get the value for each header using the class indexer. Compiling and running Listing 21-4 produces the following results: Header: VTag, Value: 279369612500000000 Header: Accept-Ranges, Value: bytes Header: Content-Length, Value: 1020 Header: Cache-Control, Value: no-cache Header: Content-Type, Value: text/html Header: Date, Value: Sun, 18 Jul 2010 09:40:35 GMT Header: ETag, Value: "67991fbd76a6c91:0" Header: Last-Modified, Value: Mon, 16 Mar 2009 20:35:26 GMT Header: P3P, Value: CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI" Header: Server, Value: Microsoft-IIS/7.5 Header: X-Powered-By, Value: ASP.NET Press enter to finish
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CHAPTER 21 NETWORKING & WCF
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All of the WebClient examples so far in this section have been synchronous, meaning that the code doesn t continue executing until the request to the server has been completed. WebClient also supports asynchronous requests where you are notified that a request is completed through an event. Listing 21-5 contains an example. Listing 21-5. Using WebClient to Asynchronously Request Data using System; using System.Net; class Listing 05 { static void Main(string[] args) { // create a new WebClient objecty WebClient myWebClient = new WebClient(); // subscribe to an event myWebClient.DownloadStringCompleted += (sender, eventArgs) => { // write out the first part of the string Console.WriteLine("--- Async Result ---"); Console.WriteLine(eventArgs.Result.Substring(0, 50)); }; // make an asynchronous request myWebClient.DownloadStringAsync(new Uri("http://www.microsoft.com")); // do some other work while the request is being performed in the background for (int i = 0; i < 10; i++) { Console.WriteLine("Doing other work...{0}", i); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 21-5 uses a lambda expression to subscribe to the DownloadStringCompleted event in the WebClient object before calling the DownloadStringAsync method. The DownloadStringAsync method takes a System.Uri parameter. The simplest way to create an Uri is to use the constructor that takes a string parameter whose value is the URL you want to retrieve. The DownloadStringAsync method returns immediately, and the request is performed in the background. In Listing 21-5, a for loop simulates a program doing other work while the request is being handled. When the request has been completed and the result converted into a string, the lambda expression is called. The parameters passed to the lambda expression are the WebClient that has performed the request and a DownloadStringCompletedEventArgs object; the Result property returns the
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