qr code generator c# asp.net Networking Through the Internet Using SystemNet in C#

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Networking Through the Internet Using SystemNet
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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
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WebRequest
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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 commonly used methods defined by WebRequest that support synchronous communications are shown in Table 26-1 The properties defined by WebRequest are shown in Table 26-2 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 can be 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
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Method public static WebRequest Create(string requestUriString) Description Creates a WebRequest object for the URI specified by the string passed by requestUriString 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 requestUri 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 WebResponse object Your program will use this object to obtain information from the specified URI
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PART II
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public static WebRequest Create(Uri requestUri)
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public virtual Stream GetRequestStream( ) public virtual WebResponse GetResponse( )
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TABLE 26-1
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Commonly Used Methods De ned by WebRequest that Support Synchronous Communications
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Part II:
Exploring the C# Library
Property public AuthenticationLevel AuthenticationLevel( get; set; } public virtual RequestCachePolicy CachePolicy { get; set; } public virtual string ConnectionGroupName { get; set; } public virtual long ContentLength { get; set; } public virtual string ContentType { get; set; } public virtual ICredentials Credentials { get; set; } public static RequestCachePolicy DefaultCachePolicy { get; set; } public static IWebProxy DefaultWebProxy { get; set; } public virtual WebHeaderCollection Headers{ get; set; } public TokenImpersonationLevel ImpersonationLevel { get; set; } public virtual string Method { get; set; } public virtual bool PreAuthenticate { get; set; }
Description Obtains or sets the authentication level Obtains or sets the cache policy, which controls when a response can be obtained from the cache Obtains or sets the connection group name Connection groups are a way of creating a set of requests They are not needed for simple Internet transactions Obtains or sets the length of the content Obtains or sets the description of the content Obtains or sets credentials Obtains or sets the default cache policy, which controls when a request can be obtained from the cache Obtains or sets the default proxy Obtains or sets a collection of the headers Obtains or sets the impersonation level Obtains or sets the protocol If true, authentication information is included when the request is sent If false, authentication information is provided only when requested by the URI Obtains or sets the proxy server This applies only to environments in which a proxy server is used Obtains the URI of the request Obtains or sets the number of milliseconds that a request will wait for a response To wait forever, use TimeoutInfinite Obtains or sets a value that determines if default credentials are used for authentication If true, the default credentials (ie, those of the user) are used They are not used if false
public virtual IWebProxy Proxy { get; set; } public virtual Uri RequestUri { get; } public virtual int Timeout { get; set; }
public virtual bool UseDefaultCredential { get; set; }
TABLE 26-2
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