我正在尝试转换一些在 VB 中运行良好的代码，但我不知道在 .Net 中要使用哪些对象。
Dim oXMLHttp As XMLHTTP
oXMLHttp = New XMLHTTP
oXMLHttp.open "POST", "https://www.server.com/path", False
oXMLHttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
oXMLHttp.send requestString
基本上，我想将 XML 文件发送到服务器，然后存储它返回的响应。谁能指出我正确的方向？
【问题讨论】：
答案是使用WebClient类：-
WebClient webClient = new WebClient();
NameValueCollection values = new NameValueCollection();
values.add("firstname", "Slarti");
values.add("lastname", "Bart-fast");
byte[] response = webClient.UploadValues("http://server/path", values);
UploadValues 方法使用 application/x-www-form-urlencoded 内容类型构建 POST 请求，并正确编码传递给它的 NameValueCollection 中列出的值集。
响应是一个字节数组，然后您可以使用它做一些适当的事情。
【讨论】：
有关执行此操作的示例，请参见以下内容：http://www.codeproject.com/KB/dotnet/NET_Interact_j2EE.aspx 我把样本放在下面。对不起，我知道它很大，但你永远不知道这样的链接会保持多久。 注意：问题的第一个版本没有在 C# .NET 中说 - 它只是说“在 .NET 中”。 （也许它被标记为 C# 而我没有看到它）从 VB.NET 转换为 C# 非常容易（尽管没有必要）。 '这个类代表了与 MSXML.XMLHTTP 中的 xmlHTTP 对象相同的功能。
Imports System.Net
Imports System.Web.HttpUtility
Public Class XMLHTTP
'Makes an internet connection to specified URL
Public Overridable Sub open(ByVal bstrMethod As String, _
ByVal bstrUrl As String, Optional ByVal varAsync As _
Object = False, Optional ByVal bstrUser _
As Object = "", Optional ByVal bstrPassword As Object = "")
Try
strUrl = bstrUrl
strMethod = bstrMethod
'Checking if proxy configuration
'is required...(blnIsProxy value
'from config file)
If blnIsProxy Then
'Set the proxy object
proxyObject = WebProxy.GetDefaultProxy()
'Finding if proxy exists and if so set
'the proxy configuration parameters...
If Not (IsNothing(proxyObject.Address)) Then
uriAddress = proxyObject.Address
If Not (IsNothing(uriAddress)) Then
_ProxyName = uriAddress.Host
_ProxyPort = uriAddress.Port
End If
UpdateProxy()
End If
urlWebRequest.Proxy = proxyObject
End If
'Make the webRequest...
urlWebRequest = System.Net.HttpWebRequest.Create(strUrl)
urlWebRequest.Method = strMethod
If (strMethod = "POST") Then
setRequestHeader("Content-Type", _
"application/x-www-form-urlencoded")
End If
'Add the cookie values of jessionid of weblogic
'and PH-Session value of webseal
'for retaining the same session
urlWebRequest.Headers.Add("Cookie", str_g_cookieval)
Catch exp As Exception
SetErrStatusText("Error opening method level url connection")
End Try
End Sub
'Sends the request with post parameters...
Public Overridable Sub Send(Optional ByVal objBody As Object = "")
Try
Dim rspResult As System.Net.HttpWebResponse
Dim strmRequestStream As System.IO.Stream
Dim strmReceiveStream As System.IO.Stream
Dim encode As System.Text.Encoding
Dim sr As System.IO.StreamReader
Dim bytBytes() As Byte
Dim UrlEncoded As New System.Text.StringBuilder
Dim reserved() As Char = {ChrW(63), ChrW(61), ChrW(38)}
urlWebRequest.Expect = Nothing
If (strMethod = "POST") Then
If objBody <> Nothing Then
Dim intICounter As Integer = 0
Dim intJCounter As Integer = 0
While intICounter < objBody.Length
intJCounter = _
objBody.IndexOfAny(reserved, intICounter)
If intJCounter = -1 Then
UrlEncoded.Append(System.Web.HttpUtility.UrlEncode(objBody.Substring(intICounter, _
objBody.Length - intICounter)))
Exit While
End If
UrlEncoded.Append(System.Web.HttpUtility.UrlEncode(objBody.Substring(intICounter, _
intJCounter - intICounter)))
UrlEncoded.Append(objBody.Substring(intJCounter, 1))
intICounter = intJCounter + 1
End While
bytBytes = _
System.Text.Encoding.UTF8.GetBytes(UrlEncoded.ToString())
urlWebRequest.ContentLength = bytBytes.Length
strmRequestStream = urlWebRequest.GetRequestStream
strmRequestStream.Write(bytBytes, 0, bytBytes.Length)
strmRequestStream.Close()
Else
urlWebRequest.ContentLength = 0
End If
End If
rspResult = urlWebRequest.GetResponse()
strmReceiveStream = rspResult.GetResponseStream()
encode = System.Text.Encoding.GetEncoding("utf-8")
sr = New System.IO.StreamReader(strmReceiveStream, encode)
Dim read(256) As Char
Dim count As Integer = sr.Read(read, 0, 256)
Do While count > 0
Dim str As String = New String(read, 0, count)
strResponseText = strResponseText & str
count = sr.Read(read, 0, 256)
Loop
Catch exp As Exception
SetErrStatusText("Error while sending parameters")
WritetoLog(exp.ToString)
End Try
End Sub
'Setting header values...
Public Overridable Sub setRequestHeader(ByVal bstrHeader _
As String, ByVal bstrValue As String)
Select Case bstrHeader
Case "Referer"
urlWebRequest.Referer = bstrValue
Case "User-Agent"
urlWebRequest.UserAgent = bstrValue
Case "Content-Type"
urlWebRequest.ContentType = bstrValue
Case Else
urlWebRequest.Headers(bstrHeader) = bstrValue
End Select
End Sub
Private Function UpdateProxy()
Try
If Not (IsNothing(uriAddress)) Then
If ((Not IsNothing(_ProxyName)) And _
(_ProxyName.Length > 0) And (_ProxyPort > 0)) Then
proxyObject = New WebProxy(_ProxyName, _ProxyPort)
Dim strByPass() As String = Split(strByPassList, "|")
If strByPass.Length > 0 Then
proxyObject.BypassList = strByPass
End If
proxyObject.BypassProxyOnLocal = True
If blnNetworkCredentials Then
If strDomain <> "" Then
proxyObject.Credentials = New _
NetworkCredential(strUserName, _
strPwd, strDomain)
Else
proxyObject.Credentials = New _
NetworkCredential(strUserName, _
strPwd)
End If
End If
End If
End If
Catch exp As Exception
SetErrStatusText("Error while updating proxy configurations")
WritetoLog(exp.ToString)
End Try
End Function
'Property for setting the Responsetext
Public Overridable ReadOnly Property ResponseText() As String
Get
ResponseText = strResponseText
End Get
End Property
Private urlWebRequest As System.Net.HttpWebRequest
Private urlWebResponse As System.Net.HttpWebResponse
Private strResponseText As String
Private strUrl As String
Private strMethod As String
Private proxyObject As WebProxy
Private intCount As Integer
Private uriAddress As Uri
Private _ProxyName As String
Private _ProxyPort As Integer
End Class
【讨论】：