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prefix of the URI specifies the protocol For example, http://wwwHerbSchildtcom uses the prefix http, which specifies hypertext transfer protocol As mentioned earlier, WebRequest and WebResponse are abstract classes that define the general request/response operations that are common to all protocols From them are derived concrete classes that implement specific protocols Derived classes register themselves, using the static method RegisterPrefix( ), which is defined by WebRequest When you create a WebRequest object, the protocol specified by the URI s prefix will automatically be used, if it is available The advantage of this pluggable approach is that most of your code remains the same no matter what type of protocol you are using The NET runtime automatically defines the HTTP, HTTPS, file, and FTP protocols Thus, if you specify a URI that uses the HTTP prefix, you will automatically receive the HTTP-compatible class that supports it If you specify a URI that uses the FTP prefix, you will automatically receive the FTP-compatible class that supports it Because HTTP is the most commonly used protocol, it is the only one discussed in this chapter (The same techniques, however, will apply to all supported protocols) The classes that support HTTP are HttpWebRequest and HttpWebResponse These classes inherit WebRequest and WebResponse and add several members of their own, which apply to the HTTP protocol SystemNet supports both synchronous and asynchronous communication For many Internet uses, synchronous transactions are the best choice because they are easy to use With synchronous communications, your program sends a request and then waits until the response is received For some types of high-performance applications, asynchronous communication is better Using the asynchronous approach, your program can continue processing while waiting for information to be transferred However, asynchronous communications are more difficult to implement Furthermore, not all programs benefit from an asynchronous approach For example, often when information is needed from the Internet, there is nothing to do until the information is received In cases like this, the potential gains from the asynchronous approach are not realized Because synchronous Internet access is both easier to use and more universally applicable, it is the only type examined in this chapter Since WebRequest and WebResponse are at the heart of SystemNet, they will be examined next.

The WebRequest class manages a network request It is abstract because it does not implement a specific protocol It does, however, define those methods and properties common to all requests The methods defined by WebRequest that support synchronous communications are shown in Table 25-1 The properties defined by WebRequest are shown in Table 25-2 The default values for the properties are determined by derived classes WebRequest defines no public constructors To send a request to a URI, you must first create an object of a class derived from WebRequest that implements the desired protocol This is done by calling Create( ), which is a static method defined by WebRequest Create( ) returns an object of a class that inherits WebRequest and implements a specific protocol

a. Double-click the AssemblyVersion.cs file. b. Modify the AssemblyVersion line to contain the desired version number. 5 Rename the Class1.cs file name to PhotoAlbum.cs.

25:

a. Right-click on the Class1.cs file. b. Select Rename. c. Enter PhotoAlbum.cs for the file name. 6 Rename the Class1 class name to PhotoAlbum.

Method public static WebRequest Create(string uri)

Description Creates a WebRequest object for the URI specified by the string passed by uri The object returned will implement the protocol specified by the prefix of the URI Thus, the object will be an instance of a class that inherits WebRequest A NotSupportedException is thrown if the requested protocol is not available A UriFormatException is thrown if the URI format is invalid Creates a WebRequest object for the URI specified by uri The object returned will implement the protocol specified by the prefix of the URI Thus, the object will be an instance of a class that inherits WebRequest A NotSupportedException is thrown if the requested protocol is not available Returns an output stream associated with the previously requested URI Sends the previously created request and waits for a response When a response is received, it is returned as a WebReponse object Your program will use this object to obtain information from the specified URI

The PhotoAlbum.cs file should look like this:

The most useful of all your EV on-board instruments is your ammeter The dual-scale model shown in Figure 9-15 (top left) delivers 0- to 50-amp or 0- to 500-amp monitoring ranges at the flip of a switch The higher range enables you to determine your motor s instantaneous current draw; it functions much like a vacuum gauge in an internal combustion engine vehicle the less current, the higher the range, and so on The lower range functions the same as the ammeter that might already be on the instrument cluster of your internal combustion conversion vehicle it tells you the amount of current your 12-volt accessories are consuming

public static WebRequest Create(Uri uri)