是否可以从URL读取到System.IO.Stream对象？

Question

我正在尝试从URL读取到System.IO.Stream对象。我试图使用

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

但我得到一个错误，URI格式不支持FileStream对象。是否有一些方法可以使用从System.IO.Stream继承，它可以从URL中读取？

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，你可以使用一个HttpWebRequest对象得到响应流：

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

（从the docs剥离并简化）。