如何构建将音频文件下载到本地文件夹或从 silverlight 应用程序下载文件夹的功能？

Question

我有一个 silverlight 网络应用程序，其中我有播放 audio/sound files.Currently 声音文件的功能存储在 Client Bin 文件夹中，声音文件可以在 server.I 想要构建一个功能 将这些声音文件下载到用户电脑。 我尝试使用保存文件对话框，但无法下载音频文件。

Answer 1

试试这个 webclient methods not available to my Silverlight application

You can best achieve what you want in Silverlight by using WebClient.OpenReadCompleted and OpenReadAsync. This will return a stream. You can use that directly, or copy the stream into a byte[] as described here for example: http://www.yoda.arachsys.com/csharp/readbinary.html

Answer 2

解决方案是- 我从服务器的客户端 bin 文件夹中获取音频文件，然后使用保存文件对话框将其下载到客户端机器上的本地文件夹。 如下-

 Private Sub btn_downloadSound_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
    If streamAudio_download Is Nothing Then
        MessageBox.Show("Audio file does not exists for selected sound feature")
    Else
        saveFileDialog1.Filter = "MP3 Files (*.mp3)|*.mp3|MP4 Files|*.mp4"
        saveFileDialog1.ShowDialog()
        Dim words As String() = soundFileSelected_Name.Split(".")
        Dim fileExtension As String = words(1)
        Using audiofs As System.IO.FileStream = saveFileDialog1.OpenFile()
            If fileExtension = "mp3" Then
                Dim bytes As Byte() = New Byte(40) {}
                Dim bytesToRead As Integer = 0
                bytesToRead = streamAudio_download.Read(bytes, 0, bytes.Length)

                While (bytesToRead = streamAudio_download.Read(bytes, 0, bytes.Length)) <> 0
                    audiofs.Write(bytes, 0, bytesToRead)
                End While
            ElseIf fileExtension = "mp4" Then
                Dim b As New BinaryWriter(audiofs)
                b.Write(byteArray)
                audiofs.Close()
            End If
        End Using
    End If
End Sub