Xml vb.net WebRequest Post在包含和时发出400个错误请求

我遇到了一个WebRequest的问题，当帖子包含一个符号时。当尝试获取响应时，我被抛出一个400错误请求错误。我在postData变量上尝试了HttpServerUtility.UrlEncode，但这也会引发错误

这是我的密码：

Dim request As WebRequest
Dim postData As String = String.Empty
Dim byteArray As Byte()
Dim dataStream As Stream = Nothing
Dim response As WebResponse = Nothing

Dim reader As StreamReader = Nothing
Dim responseFromServer As String
request = WebRequest.Create(_strWSURL)
request.Method = "POST"
postData = "p_input_xml_doc=<?xml version=""1.0"" encoding=""UTF-8""?>
<XMLRootNode>
 <Transactions>
  <Transaction>
   <Data>FirstNode</Data>
  </Transaction>
  <Transaction>
   <Data>Second&amp;Node</Data>
  </Transaction>
 </Transactions
</XMLRootNode>"

byteArray = Encoding.UTF8.GetBytes(postData)
request.ContentType = "text/xml; encoding='utf-8'"
request.ContentLength = byteArray.Length
dataStream = request.GetRequestStream()
dataStream.Write(byteArray, 0, byteArray.Length)
dataStream.Close()
response = request.GetResponse()'<--Thorws "The remote server returned an error: (400) Bad Request."

dataStream = response.GetResponseStream()
reader = New StreamReader(dataStream)
responseFromServer = reader.ReadToEnd()

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你打什么类型的电话？WCF？是你写的吗？你调试过了吗？您是否尝试过使用fiddler来检查网络上发生了什么？您可以在节点的原始内容中添加[]标记，但是，我同意@RickS的观点，即请求看起来有点奇怪，它不是由我编写的，而是由我们正在合作的合作伙伴编写的。这可能是他们这边的错误吗？我假设，由于这是一个错误的请求错误，它与HTTP请求有关。