How to access data obtained by WebClient.DownloadDataAsync?

问题

(This is a follow-up question to this one.)

I want to read an endless audio stream asynchronously, so that I can do my JIT analysis on the obtained data. Using a WebClient object's DownloadDataAsync method, I can initiate the download easily, see following Win form project:

Imports System.Net      'For WebClient

Public Class Form1
    Private WithEvents c As New WebClient()

    Protected Overrides Sub Finalize()
        c.Dispose()
        MyBase.Finalize()
    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim u As New Uri("http://flower.serverhostingcenter.com:8433/;")
        c.DownloadDataAsync(u)
    End Sub

    Private Sub c_DownloadProgressChanged(sender As Object, e As DownloadProgressChangedEventArgs) Handles c.DownloadProgressChanged
        Debug.Print(e.BytesReceived.ToString & " B received.")
    End Sub
End Class

and the stream seems to flow, as per the DownloadProgressChanged event's output to the immediate window:

2920 B received.
48180 B received.
56940 B received.
61320 B received.
87600 B received.
94900 B received.
160436 B received.
162060 B received.
227596 B received.
...

However, I lack to find a method to also read the obtained data. As this is an endless stream, DownloadDataCompleted will never fire (nor does any other event except the one used).

How do I access the obtained data?

回答1:

Use OpenReadAsync in conjunction with the OpenReadCompleted event.

Private Sub c_OpenReadCompleted(sender As Object, e As OpenReadCompletedEventArgs) Handles c.OpenReadCompleted
   Dim stream = e.Result
End Sub

来源：https://stackoverflow.com/questions/44964227/how-to-access-data-obtained-by-webclient-downloaddataasync