VB.NET: How to make a webRequest async

Question

I think this is a simple question for you, but I don't understand other cases of webRequests, so I asked here:

How can I make this webRequest asynchronous?

Dim sBuffer As String
Dim oRequest As WebRequest = WebRequest.Create(url)
oRequest.Method = "GET"
Dim oResponse As WebResponse = oRequest.GetResponse()
Dim oStream As New StreamReader(oResponse.GetResponseStream())
sBuffer = oStream.ReadToEnd()
oStream.Close()
oResponse.Close()
Return sBuffer

Thank you for your help!

Regards, Flo

Paul Creasey · Accepted Answer · 2011-10-01 19:16:30Z

2

a function with a simple return value cannot be sinmply made asynchronous, you need to find another method of handling the data that comes back. I would suggest using System.Net.WebClient which is a much easier wrapper on what you've done above, with this class asynch is really easy.

Dim wc As New WebClient
AddHandler wc.DownloadStringCompleted, AddressOf DownloadCompletedHander
wc.DownloadStringAsync(url)

...

Public Shared Sub DownloadCompletedHander(ByVal sender As Object, ByVal e As DownloadStringCompletedEventArgs)
    If e.Cancelled = False AndAlso e.Error Is Nothing Then
        Dim myString As String = CStr(e.Result)
        'Do stuff with data
    End If

End Sub

I don't really speak VB.net but i think thats right from some googling

answered Oct 1, 2011 at 19:16

Paul Creasey

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1 Comment

gumuruh Over a year ago

how could you put the POST and its parameter using that ?

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