Name
FileWebRequest
Synopsis
This subclass of WebRequest
provides access to resources that use the file
URL scheme (such as a file on your local filesystem).
Use WebRequest.Create()
with a
file:// URL to create an instance of this
class. The WebRequest.Create()
method returns an instance of this class as a reference of type WebRequest
.
You may feel a small sense of confusion regarding this
type and the “file:” protocol scheme; if a program needs access to a file
on the filesystem, why not simply open a System.IO.FileStream
instead of using WebRequest.Create("file:/...")
? In
terms of straight functionality, the System.IO.FileStream
call more closely represents the fact that this resource is coming
from disk; however, due to the ubiquity of HTTP servers growing within
the enterprise, there are often times when a system wishes to equally
represent HTTP URLs and filesystem paths within an arbitrary context.
For example, a configuration file might be used to indicate where to
retrieve user preferences; by specifying the location as an URL rather
than an absolute file location, storage of user preferences is permitted on
a centralized server without any additional code.
(This allows
a kind of “roaming preferences” capability within the system.) Many of
the .NET tools also use this approach to identify “files” to act
upon via command-line parameters.
Public Class FileWebRequest : Inherits WebRequest ' Protected Constructors Protected Sub New( ByVal serializationInfo As System.Runtime.Serialization.SerializationInfo, ...
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