使用VB.NET自动下载文件而无需保存对话框

问题描述

我想从浏览器自动下载文件，我们不需要显示保存"对话框.

i want to download file automatically from browser,we need not show save dialog box.

Private Sub DownloadFile(ByVal fullpath As String, ByVal forceDownload As Boolean)
        '    Dim path As Path
        Dim name = Path.GetFileName(fullpath)
        Dim ext = Path.GetExtension(fullpath)
        Dim type As String = ""

        If Not IsDBNull(ext) Then
            ext = LCase(ext)
        End If

        Select Case ext
            Case ".htm", ".html"
                type = "text/HTML"
            Case ".txt"
                type = "text/plain"
            Case ".doc", ".rtf"
                type = "Application/msword"
            Case ".csv", ".pdf"
                type = "Application/pdf"
            Case ".zip", ".ZIP"
                type = "Application/zip"
            Case ".zip", ".csv"
                type = "text/csv"
            Case Else
                type = "text/plain"
        End Select

        If (forceDownload) Then
            Response.AppendHeader("content-disposition", "attachment; filename=" + name)
        End If
        If type <> "" Then
            Response.ContentType = type
        End If

        Response.WriteFile(fullpath)

        Response.End()
    End Sub

我尝试过的事情:

尝试了上面的代码.

What I have tried:

Tried the above code.

推荐答案

WebClient webClient = new WebClient();
webClient.Credentials = new System.Net.NetworkCredential("UserName", "Password", "Domain");
webClient.DownloadFile("fromURL", "C:\localfile.txt");

这未经测试，您仍然可以使用WebBrowser对象登录，然后使用具有默认凭据的WebClient并调用其DownloadFile()方法:

This is untested, by you may still be able to use your WebBrowser object to login, and then use a WebClient with the default credentials and call its DownloadFile() method:

WebClient webClient = new WebClient();
webClient.UseDefaultCredentials = true;
// or try webClient.Credentials = CredentialCache.DefaultCredentials;
webClient.DownloadFile("fromURL", "C:\localfile.txt");

或者，您可以尝试添加OnFileDownload事件.如果在保存文件"对话框之前调用它，则可以取消下载，然后通过WebClient对象启动下载....

OR you can try adding the OnFileDownload event. If it''s called prior to the Save File dialog, then you can cancel the download, and launch the download through the WebClient object....

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