Kan man lave multiple downloads med checkboxes? i vb.net
hej er begyndt at bruge WebClient i vp.net først startede jeg med at lave en knap som lavede et download men kan man tilknytte det til checkboxes? fx hvis jeg havde 10 checkboxes så kunne jeg have 10 downloads? kender tror ikke jeg kender koden men har prøvet men når jeg fx har valgt to checkboxes så beder den om hvor de 2 filer skal saves men så er der kun 1 som bliver downloadet? nogen som ved hvad jeg gør galt?kode:
Imports System.Net
Imports System.IO
Imports System.Diagnostics
Public Class Form1
Private WithEvents WC As WebClient
#Region "Download RateVariables"
Private ChangeInAmount As Integer
Private PreviousAmount As Integer
Private NextCheck As DateTime
#End Region
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
setstatus("0 kb", "0kb", "0%", "0kb/s")
WC = New WebClient
End Sub
Private Sub setstatus(CurDownload As String, ByVal TotalDownload As String, ByVal Percentage As String, ByVal Rate As String)
Label1.Text = "Downloaded : " & CurDownload
Label2.Text = "Download Size : " & TotalDownload
Label3.Text = "Rate : " & Rate
Label4.Text = "Percentage : " & Percentage
End Sub
Public Function CalculateRate(ByVal Input As Integer) As String
Return Processbytes(Input) & "/s"
End Function
Public Function Processbytes(ByVal Input As Integer) As String
'Check if the file is 1GB or more
If Input >= 1073741824 Then
Return Math.Round(CDbl(Input / 1073741824), 2) & " GB"
Else
'Check for MB
If Input >= 1048576 Then
Return Math.Round(CDbl(Input / 1048576), 2) & " MB"
Else
'Can only be in KB
Return Math.Round(CDbl(Input / 1024), 2) & " KB"
End If
End If
End Function
Private Function CDb1(p1 As Double) As Double
Throw New NotImplementedException
End Function
Private Sub WC_DownloadFileCompleted(sender As Object, e As System.ComponentModel.AsyncCompletedEventArgs) Handles WC.DownloadFileCompleted
ProgressBar1.Value = 0
ProgressBar1.Maximum = 0
ChangeInAmount = 0
PreviousAmount = 0
NextCheck = Now.AddSeconds(1)
End Sub
Private Sub WC_DownloadProgressChanged(sender As Object, e As DownloadProgressChangedEventArgs) Handles WC.DownloadProgressChanged
Try
If Now > NextCheck Then
ChangeInAmount = e.BytesReceived - PreviousAmount
PreviousAmount = e.BytesReceived
NextCheck.AddSeconds(1)
End If
Dim Rate As String = CalculateRate(ChangeInAmount)
ProgressBar1.Maximum = e.TotalBytesToReceive
ProgressBar1.Value = e.BytesReceived
setstatus(Processbytes(e.BytesReceived), Processbytes(e.TotalBytesToReceive), e.ProgressPercentage, Rate)
Catch
End Try
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If CheckBox1.Checked = True Then
Dim webAddress As String = "url"
Dim SFD As New SaveFileDialog
If SFD.ShowDialog() = DialogResult.OK Then
WC.DownloadFileAsync(New Uri("url"), SFD.FileName)
End If
End If
If CheckBox2.Checked = True Then
Dim webAddress As String = "url"
Dim SFD As New SaveFileDialog
If SFD.ShowDialog() = DialogResult.OK Then
WC.DownloadFileAsync(New Uri("url"), SFD.FileName)
End If
End If
If CheckBox3.Checked = True Then
Dim webAddress As String = "url"
Dim SFD As New SaveFileDialog
If SFD.ShowDialog() = DialogResult.OK Then
WC.DownloadFileAsync(New Uri("url"), SFD.FileName)
End If
End If
End Sub
End Class
