使用WebClient從SSRS報告下載CSV文件

Question

我試圖從SSRS報告中下載一個csv文件，使用下面的代碼。

Const URI As String = "https://blah.blah.com/blah/_layouts/15/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/blah/Production%20Reports/The_File.rdl&rs:format=csv" 
Const DESTINATION As String = "C:\MyFile.csv" 

Using myWebClient As WebClient = New WebClient() 
    With myWebClient 
     .Headers.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8") 
     .Headers.Add("Accept-Encoding", "gzip, deflate, sdch, br") 
     .Headers.Add("Accept-Language", "en-US,en;q=0.8") 
     .Headers.Add("Content-Disposition", "attachment; filename=%22The%5FFile.csv%22") 
     .Headers.Add("Content-Encoding", "gzip") 
     .Headers.Add("Content-Type", "text/csv") 
     .Headers.Add("Vary", "Accept-Encoding") 
     .Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36") 
     .Headers.Add("Upgrade-Insecure-Requests", "1") 
     .Headers.Add("Referer", URI) 
     .Headers.Add("Cache-Control", "private") 

     .Credentials = New NetworkCredential("<my username>", "<my password>") 
     .DownloadFile(URI, DESTINATION) 
    End With 
End Using 

問題是下載的文件不是csv文件。當我在任何文本編輯器中打開它時，我所看到的都是「垃圾」字符，它們似乎正在進行某種編碼。如果我註釋掉「Accept-Encoding」頭並重新運行代碼，我會得到生成的HTML頁面的代碼 - 而不是我需要的csv文件。任何人都知道我可以如何正確下載文件？順便說一句，我不確定我添加的所有標題都是必需的。

Answer 1

你需要的URI不斷從：

Const URI As String = "https://blah.blah.com/blah/_layouts/15/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/blah/Production%20Reports/The_File.rdl&rs:format=csv"

要這樣：

Const URI As String = "https://blah.blah.com/blah/_layouts/15/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/blah/Production%20Reports/The_File.rdl&rs:format=csv&rs:Command=Render"

你缺少URI的Command=Render一部分。