Export (0) Print
Expand All

FileWebRequest.EndGetResponse Method

Ends an asynchronous request for a file system resource.

Namespace:  System.Net
Assembly:  System (in System.dll)

'Declaration
Public Overrides Function EndGetResponse ( _
	asyncResult As IAsyncResult _
) As WebResponse

Parameters

asyncResult
Type: System.IAsyncResult

An IAsyncResult that references the pending request for a response.

Return Value

Type: System.Net.WebResponse
A WebResponse that contains the response from the file system resource.

ExceptionCondition
ArgumentNullException

asyncResult is Nothing.

The EndGetResponse method completes an asynchronous request for a file system resource that was started with the BeginGetResponse method.

The following code example uses the EndGetResponse method to end an asynchronous request for a file system resource.

Public Class RequestDeclare
    Public myFileWebRequest As FileWebRequest

    Public Sub New()
        myFileWebRequest = Nothing 
    End Sub ' New 
End Class ' RequestDeclare



Class FileWebRequest_resbeginend

    Public Shared allDone As New ManualResetEvent(False)

    ' Entry point which delegates to C-style main Private Function. 
    Public Overloads Shared Sub Main()
        Main(GetCommandLineArgs())
    End Sub 

    Overloads Shared Sub Main(args() As String)

        If args.Length < 2 Then
            Console.WriteLine(ControlChars.Cr + "Please enter the file name as command line parameter:")
            Console.WriteLine("Usage:FileWebRequest_resbeginend " + ChrW(60) + "systemname" + ChrW(62) + "/" + ChrW(60) + "sharedfoldername" + ChrW(62) + "/" + ChrW(60) + "filename" + ChrW(62) + ControlChars.Cr + "Example:FileWebRequest_resbeginend shafeeque/shaf/hello.txt")

        Else 
            Try 

                ' Place a webrequest. 
                Dim myWebRequest As WebRequest = WebRequest.Create(("file://" + args(1)))
                ' Create an instance of the 'RequestDeclare' and associating the 'myWebRequest' to it.		 
                Dim myRequestDeclare As New RequestDeclare()
                myRequestDeclare.myFileWebRequest = CType(myWebRequest, FileWebRequest)

                ' Begin the Asynchronous request for getting file content using 'BeginGetResponse()' method.	 
                 Dim asyncResult As IAsyncResult = CType(myRequestDeclare.myFileWebRequest.BeginGetResponse(AddressOf RespCallback, myRequestDeclare), IAsyncResult)
                 allDone.WaitOne()


            Catch e As ArgumentNullException
                Console.WriteLine(("ArgumentNullException is :" + e.Message))
            Catch e As UriFormatException
                Console.WriteLine(("UriFormatException is :" + e.Message))
            End Try 
        End If 
    End Sub ' Main


    Private Shared Sub RespCallback(ar As IAsyncResult)



        ' State of request is asynchronous. 
        Dim requestDeclare As RequestDeclare = CType(ar.AsyncState, RequestDeclare)

        Dim myFileWebRequest As FileWebRequest = requestDeclare.myFileWebRequest

        ' End the Asynchronus request by calling the 'EndGetResponse()' method. 
        Dim myFileWebResponse As FileWebResponse = CType(myFileWebRequest.EndGetResponse(ar), FileWebResponse)

        ' Reade the response into Stream. 
        Dim streamReader As New StreamReader(myFileWebResponse.GetResponseStream())


        Dim readBuffer(256) As [Char]

        Dim count As Integer = streamReader.Read(readBuffer, 0, 256)

        Console.WriteLine("The contents of the file are :"+ControlChars.Cr)

        While count > 0
            Dim str As New [String](readBuffer, 0, count)
            Console.WriteLine(str)
            count = streamReader.Read(readBuffer, 0, 256)
        End While
	     streamReader.Close()
        ' Release the response object resources.
	     myFileWebResponse.Close()
        allDone.Set()
        Console.WriteLine("File reading is over.")
    End Sub ' RespCallback 
End Class ' FileWebRequest_resbeginend

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Show:
© 2014 Microsoft