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Using WebClient
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Before concluding this chapter, a brief discussion of WebClient is warranted As mentioned near the start of this chapter, if your application only needs to upload or download data to
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26:
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or from the Internet, then you can use WebClient instead of WebRequest and WebResponse The advantage to WebClient is that it handles many of the details for you WebClient defines one constructor, shown here: public WebClient( ) WebClient defines the properties shown in Table 26-6 WebClient defines a large number of methods that support both synchronous and asynchronous communication Because asynchronous communication is beyond the scope of this chapter, only those methods that support synchronous requests are shown in Table 26-7 All methods throw a WebException if an error occurs during transmission
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PART II
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Property public string BaseAddress { get; set; }
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Description Obtains or sets the base address of the desired URI If this property is set, then relative addresses specified by the WebClient methods will be relative to the base address Obtains or sets the policy that determines when the cache is used Obtains or sets authentication information This property is null by default Obtains or sets the character encoding used while transferring strings Obtains or sets the collection of the request headers If the request is still transferring information, this property is true It is false otherwise Obtains or sets the proxy Obtains or sets a query string consisting of name/value pairs that can be attached to a request The query string is separated from the URI by a If more than one name/value pair exists, then an & separates each pair Obtains a collection of the response headers 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
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public RequestCachePolicy CachePolicy { get; set; } public ICredentials Credentials { get; set; } public Encoding Encoding { get; set; } public WebHeaderCollection Headers{ get; set; } public bool IsBusy( get; } public IWebProxy Proxy { get; set; } public NameValueCollection QueryString { get; set; }
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public WebHeaderCollection ResponseHeaders{ get; } public bool UseDefaultCredentials { get; set; }
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TABLE 26-6
The Properties De ned by WebClient
Part II:
Exploring the C# Library
Method public byte[ ] DownloadData(string address) public byte[ ] DownloadData(Uri address) public void DownloadFile(string address, string fileName) public void DownloadFile(Uri address, string fileName) public string DownloadString(string address) public string DownloadString(Uri address) public Stream OpenRead(string address)
Description Downloads the information at the URI specified by address and returns the result in an array of bytes Downloads the information at the URI specified by address and returns the result in an array of bytes Downloads the information at the URI specified by address and stores the result in the file specified by fileName Downloads the information at the URI specified by address and stores the result in the file specified by fileName Downloads the information at the URI specified by address and returns the result as a string Downloads the information at the URI specified by address and returns the result as a string Returns an input stream from which the information at the URI specified by address can be read This stream must be closed after reading is completed Returns an input stream from which the information at the URI specified by address can be read This stream must be closed after reading is completed Returns an output stream to which information can be written to the URI specified by address This stream must be closed after writing is completed Returns an output stream to which information can be written to the URI specified by address This stream must be closed after writing is completed Returns an output stream to which information can be written to the URI specified by address This stream must be closed after writing is completed The string passed in method specifies how the information will be written Returns an output stream to which information can be written to the URI specified by address This stream must be closed after writing is completed The string passed in method specifies how the information will be written Writes the information specified by data to the URI specified by address The response is returned Writes the information specified by data to the URI specified by address The response is returned Writes the information specified by data to the URI specified by address The response is returned The string passed in method specifies how the information will be written
public Stream OpenRead(Uri address)
public Stream OpenWrite(string address)
public Stream OpenWrite(Uri address)
public Stream OpenWrite(string address, string method)
public Stream OpenWrite(Uri address, string method)
public byte[ ] UploadData(string address, byte[ ] data) public byte[ ] UploadData(Uri address, byte[ ] data) public byte[ ] UploadData(string address, string method, byte[ ] data)
TABLE 26-7
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