进度条 [英] Progressbar

问题描述

你好！没关系 ?我正在开发文件下载器.我是一个初学者，我想在下载中放置一个进度条.有人可以帮我提供示例代码吗?我的知识很少.如果可能的话，他们给我的细节和解释越多越好 对我来说.谢谢:D

Hello! It's ok ? I am developing file downloader. I'm a beginner, I want to put a progress bar in the download. Could someone help me with a sample code? My knowledge is little. If it were possible, the more details and explanations they gave me, the better it would be for me. Thank you: D

   私有子Button3_Click(作为对象发送，作为EventArgs发送)处理Button3.Click
       如果My.Computer.FileSystem.FileExists("C:download.jpg")= True，那么
            MsgBox("Arquivojáexistente"，vbCritical，"Download")
           退出子
       其他
           如果My.Computer.FileSystem.FileExists("C:download.jpg")= False，则
                My.Computer.Network.DownloadFile("http://tvcultura.com.br/upload/tvcultura/programas/programa-imagem-som.jpg"，"C:\ Users \ thiag \ Downloads \ arquivo.jpg" )
                Shell("explorer C:\ download.jpg"，vbHide)
           如果结束
       如果结束
   结束

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        If My.Computer.FileSystem.FileExists("C:download.jpg") = True Then
            MsgBox("Arquivo já existente", vbCritical, "Download")
            Exit Sub
        Else
            If My.Computer.FileSystem.FileExists("C:download.jpg") = False Then
                My.Computer.Network.DownloadFile("http://tvcultura.com.br/upload/tvcultura/programas/programa-imagem-som.jpg", "C:\Users\thiag\Downloads\arquivo.jpg")
                Shell("explorer C:\download.jpg", vbHide)
            End If
        End If
    End Sub

推荐答案

我正在开发文件下载器.我是一个初学者，我想在下载中放置一个进度条.有人可以帮我提供示例代码吗?

I am developing file downloader. I'm a beginner, I want to put a progress bar in the download. Could someone help me with a sample code?

如果您使用带有 showUI参数的DownloadFile重载，则用户将看到一个包含进度条的下载对话框.否则，无法将进度条与DownloadFile方法一起使用，因为 无法访问进度信息.
https://msdn.microsoft.com /en-us/library/ack30t8y(v=vs.90).aspx

If you use the overload of DownloadFile that takes the showUI argument, then the user will see a download dialog that includes a progress bar.  Otherwise there is no way to use a progress bar with the DownloadFile method because you do not have access to the progress information.
https://msdn.microsoft.com/en-us/library/ack30t8y(v=vs.90).aspx

否则，请使用此处所述的方法:
http://www.dreamincode.net/forums/topic/185093-download -file-asynchronously-with-progressbar/

Otherwise, use something like the method described here:
http://www.dreamincode.net/forums/topic/185093-download-file-asynchronously-with-progressbar/

这篇关于进度条的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！