学步园

     方法１：读取远程服务器上xml内容到dataset中,一开始直接用dataset的readxml(url)方法读取,总是出现"需要代理身份验证407"错误,用在程序中声明全局代理可以实现.

proxy
1Dim proxy As System.Net.WebProxy = New System.Net.WebProxy("61.144.254.101:80")
2        'proxy.Credentials = New System.Net.NetworkCredential("micheng", "123456789")
3
4        System.Net.GlobalProxySelection.Select = proxy

    方法２：用dataset中的readxml(io.stream)方法就可以读取到dataset中了
imports system.Net

GetPageString
 1Public Shared Function GetPageString()Function GetPageString(ByVal url As String, ByRef postMethod As String, ByRef cookies As CookieCollection, ByVal wp As WebProxy, Optional ByRef encType As String = "GB2312", Optional ByRef refer As String = "") As String
 2
 3            Dim streamData As Stream
 4
 5            If (url.StartsWith("http://") = False) Then
 6                url = "http://" & url
 7            End If
 8
 9            Dim hRqst As HttpWebRequest = HttpWebRequest.Create(url)
10
11            If cookies IsNot Nothing Then
12                hRqst.CookieContainer = New CookieContainer
13                hRqst.CookieContainer.Add(cookies)
14            End If
15
16            hRqst.ContentType = "application/x-www-form-urlencoded"
17            hRqst.Headers.Add("Accept-Language", "zh-cn")
18
19            If wp IsNot Nothing Then
20                hRqst.Proxy = wp
21            End If
22
23            If String.IsNullOrEmpty(postMethod) Then
24                hRqst.Method = "GET"
25            Else
26         hRqst.Method = postMethod
27            End If
28
29            '    Dim bt() As Byte
30
31            hRqst.AllowAutoRedirect = True
32            '    hRqst.AllowWriteStreamBuffering = True
33            '    bt = System.Text.Encoding.ASCII.GetBytes(postPara)
34            '    hRqst.ContentLength = bt.Length
35            hRqst.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
36            '    hRqst.Referer = refer
37            '    hRqst.KeepAlive = False
38            '    hRqst.Timeout = 20000
39            '    streamData = hRqst.GetRequestStream()
40            '    streamData.Write(bt, 0, bt.Length)
41            '    streamData.Close()
42
43            Dim hRsp As HttpWebResponse
44            hRsp = hRqst.GetResponse()
45            streamData = hRsp.GetResponseStream
46            If cookies IsNot Nothing And hRsp.Cookies IsNot Nothing Then
47                cookies.Add(hRsp.Cookies)
48            End If
49
50            If (encType = "") Then
51                encType = "GB2312"
52            End If
53
54            Dim readStream As New IO.StreamReader(streamData, System.Text.Encoding.GetEncoding(encType))
55            GetPageString = readStream.ReadToEnd()
56            streamData.Close()
57
58        End Function