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class NetExcDemo { static void Main() { int ch; try { // First, create a WebRequest to a URI HttpWebRequest req = (HttpWebRequest) WebRequestCreate("http://wwwMcGraw-Hillcom"); // Next, send that request and return the response HttpWebResponse resp = (HttpWebResponse) reqGetResponse(); // From the response, obtain an input stream Stream istrm = respGetResponseStream(); /* Now, read and display the html present at the specified URI So you can see what is being displayed, the data is shown 400 characters at a time After each 400 characters are displayed, you must press ENTER to get the next 400 */ for(int i=1; ; i++) { ch = istrmReadByte(); if(ch == -1) break; ConsoleWrite((char) ch); if((i%400)==0) { ConsoleWrite("\nPress Enter"); ConsoleReadLine(); } } // Close the Response This also closes istrm respClose(); } catch(WebException exc) { ConsoleWriteLine("Network Error: " + excMessage + "\nStatus code: " + excStatus); } catch(ProtocolViolationException exc) { ConsoleWriteLine("Protocol Error: " + excMessage); } catch(UriFormatException exc) { ConsoleWriteLine("URI Format Error: " + excMessage); } catch(NotSupportedException exc) { ConsoleWriteLine("Unknown Protocol: " + excMessage); } catch(IOException exc) { ConsoleWriteLine("I/O Error: " + excMessage); } catch(SystemSecuritySecurityException exc) { ConsoleWriteLine("Security Exception: " + excMessage); } catch(InvalidOperationException exc) { ConsoleWriteLine("Invalid Operation: " + excMessage); } } }

26:

Mohammed and Hannah have initiated a discussion project so that all Arabs and Jews are able to discuss their feelings about the Mideast crisis

2 3

Now the network-based exceptions that the networking methods might generate have been caught For example, if you change the call to Create( ) as shown here,

WebRequestCreate("http://wwwMcGraw-Hillcom/moonrocket");

and then recompile and run the program, you will see this output:

The portion of the curve y = x 2 between x = 1 and x = 4 is rotated about the x-axis (Figure 816) What volume does the resulting surface enclose

Since the McGraw-Hillcom website does not have a directory called moonrocket, this URI is not found, as the output confirms To keep the examples short and uncluttered, most of the programs in this chapter will not contain full exception handling However, your real-world applications must

In Table 26-1, notice that WebRequestCreate( ) has two different versions One accepts the URI as a string This is the version used by the preceding programs The other takes the URI as an instance of the Uri class, which is defined in the System namespace The Uri class encapsulates a URI Using Uri, you can construct a URI that can be passed to Create( ) You can also dissect a Uri, obtaining its parts Although you don t need to use Uri for many simple Internet operations, you may find it valuable in more sophisticated situations Uri defines several constructors Two commonly used ones are shown here: public Uri(string uriString) public Uri(Uri baseUri, string relativeUri) The first form constructs a Uri given a URI in string form The second constructs a Uri by adding a relative URI specified by relativeUri to an absolute base URI specified by baseUri An absolute URI defines a complete URI A relative URI defines only the path Uri defines many fields, properties, and methods that help you manage URIs or that give you access to the various parts of a URI Of particular interest are the properties shown here:

Property public string Host { get; } public string LocalPath { get; } public string PathAndQuery { get; } public int Port { get; } public string Query { get; } public string Scheme { get; } Description Obtains the name of the server Obtains the local file path Obtains the absolute path and query string Obtains the port number for the specified protocol For HTTP the port is 80 , Obtains the query string Obtains the protocol

At position x, the curve is x 2 units above the x-axis The point ( x, x 2 ) , under rotation, therefore generates a circle of radius x 2 The disc that the circle bounds has area A( x) = ( x 2 ) 2 Thus the described volume is

These properties are useful for breaking a URI into its constituent parts The following program demonstrates their use:

// Use Uri using System; using SystemNet;

What do you think about this revision Isn t it better Revising from a singular to a plural reference to avoid confusing or inaccurate implications is always a good idea, and sometimes it s crucial Note that in the following example, the lack of a neutral singular pronoun results in an odd structure:

Part II: