.net - 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。我试着用

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

但我收到一个错误，即 FileStream 对象不支持 URI 格式。有没有我可以使用从 System.IO.Stream 继承的可以从 URL 读取的方法？

Answer 1

使用WebClient.OpenRead：

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

Answer 2

VB.Net：

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

End Using

C＃：

var req = System.Net.WebRequest.Create("url here");
using (Stream stream = req.GetResponse().GetResponseStream())
{

}

Answer 3

是的，您可以使用 HttpWebRequest 对象来获取响应流：

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

（从文档中剥离和简化）。