是否可以從URL讀取到System.IO.Stream對象？

Question

我正在嘗試從URL讀取到System.IO.Stream對象。我試圖使用

Dim stream as Stream = New FileStream(msgURL, FileMode.Open) 

但我得到一個錯誤，URI格式不支持FileStream對象。是否有一些方法可以使用從System.IO.Stream繼承，它可以從URL中讀取？

Answer 1

VB.Net：

Using req As WebRequest = HttpWebRequest.Create("url here"), _ 
     stream As Stream = req.GetResponse().GetResponseStream() 

End Using 

C＃：

using(WebRequest req = HttpWebRequest.Create("url here")) 
using (Stream stream = req.GetResponse().GetResponseStream()) 
{ 

} 

Answer 2

使用WebClient.OpenRead：

Using wc As New WebClient() 
    Using stream As Stream = wc.OpenRead(msgURL) 
     ... 
    End Using 
End Using 

Answer 3

是的，你可以使用一個HttpWebRequest對象得到響應流：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 
HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 
Stream receiveStream = response.GetResponseStream(); 
// read the stream 
receiveStream.Close(); 
response.Close(); 

（從the docs剝離並簡化）。