Webclient.DownloadFile 到 Folderbrowser.Selectedpath答案

【问题标题】：Webclient.DownloadFile to Folderbrowser.SelectedpathWebclient.DownloadFile 到 Folderbrowser.Selectedpath
【发布时间】：2017-12-16 05:53:13
【问题描述】：

我希望我的代码从网站下载文件并将其保存到用户在 FolderBrowserDialog 中选择的目录中...我尝试了以下代码但没有成功： ' Download the files If My.Computer.Network.IsAvailable Then Try wClient.DownloadFile(New Uri("DOWNLOAD LINK"), FolderBrowserDialog1.SelectedPath & "FILENAME.123") wClient.DownloadFile(New Uri("DOWNLOAD LINK"), FolderBrowserDialog1.SelectedPath & "FileName.123) wClient.DownloadFile(New Uri("Download LINK"), FolderBrowserDialog1.SelectedPath & "FileName.123") Catch ex As Exception MessageBox.Show(ex.Message) End Try

【问题讨论】：

标签： vb.net dialog webclient downloadfile

【解决方案1】：

这是我为您编写的一些示例代码，可以帮助您入门。首先，我们将wClient 声明为WebClient 和Events，这样我们就可以触发文件下载时发生的情况。

我使用 VLC 媒体播放器作为下载示例，可以根据您的需要进行更改。注意我通过一个按钮单击事件来做到这一点，您不需要这样做。

Imports System.ComponentModel
Imports System.Net
Public Class Form1
Private WithEvents wClient As New WebClient()
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    Dim FolderBrowserDiaglog1 As New FolderBrowserDialog()
    Dim folderPath As String = ""
    Dim fileName As String = "vlc.exe"

    Dim downloadFile As String = "https://get.videolan.org/vlc/2.2.6/win32/vlc-2.2.6-win32.exe" ''VLC MEDIA PLAYER
    If FolderBrowserDiaglog1.ShowDialog() = DialogResult.OK Then
        folderPath = FolderBrowserDiaglog1.SelectedPath
    End If
    If My.Computer.Network.IsAvailable Then
        Dim combinePath As String = System.IO.Path.Combine(folderPath, fileName)
        wClient.DownloadFileAsync(New Uri(downloadFile), combinePath)
    End If
End Sub

Private Sub wClient_DownloadFileCompleted(sender As Object, e As AsyncCompletedEventArgs) Handles wClient.DownloadFileCompleted
    MessageBox.Show("File Downloaded")
End Sub
End Class

查看wClient 的事件列表并查看许多可用的选项，例如我所做的在文件下载后显示消息框的选项。

Web客户端事件https://msdn.microsoft.com/en-us/library/system.net.webclient_events(v=vs.110).aspx

【讨论】：