You are implementing a method named ProcessFile that retrieves data files from web servers and
FTP servers. The ProcessFile () method has the following method signature:
Public void ProcessFile(Guid dataFileld, string dataFileUri)
Each time the ProcessFile() method is called, it must retrieve a unique data file and then save the
data file to disk.
You need to complete the implementation of the ProcessFile() method. Which code segment should
you use?
A.
Option A
B.
Option B
C.
Option C
D.
Option D
Explanation:
* WebRequest.Create Method (Uri)
Initializes a new WebRequest instance for the specified URI scheme.
* Example:
1. To request data from a host server
Create a WebRequest instance by calling Create with the URI of the resource.
C#
WebRequest request = WebRequest.Create(“http://www.contoso.com/”);
2. Set any property values that you need in the WebRequest. For example, to enable authentication,
set the Credentials property to an instance of the NetworkCredential class.
C#
request.Credentials = CredentialCache.DefaultCredentials;
3. To send the request to the server, call GetResponse. The actual type of the returned
WebResponse object is determined by the scheme of the requested URI.
C#
WebResponse response = request.GetResponse();
4. To get the stream containing response data sent by the server, use the GetResponseStream
method of the WebResponse.
C#
Stream dataStream = response.GetResponseStream ();
D
why not b?
I would say that B is the correct answer.
FileWebRequest provides a file system implementation of the WebRequest class.
Create method returns WebRequest (https://msdn.microsoft.com/fr-fr/library/0aa3d588(v=vs.110).aspx)
GetResponse method returns WebResponse (https://msdn.microsoft.com/fr-fr/library/system.net.webrequest.getresponse(v=vs.110).aspx),
FileWebRequest is a WebRequest, Returned WebRequest may don’t implement FileWebRequest, D is correct