如何從vb.net中的帖子解析xml響應

Question

我要發布到網站上以獲取數據。 該網站將其作為xml返回。 我能夠將數據轉換為字符串。 但是我真正想做的是將xml中的每個項目都放在不同的字符串字段中。

Sub lookup(ByVal Source As Object, ByVal e As EventArgs)
  Dim wData As String
  wData = WRequest("http://PostToThisSite.com", "POST","str=31&Password=pn&UserID=Q&Postcode="+txtPcode.Text)       
  Response.Write(wData)
End Sub

Function WRequest(URL As String, method As String, POSTdata As String) As String
    Dim responseData As String = ""
      Try
        Dim hwrequest As Net.HttpWebRequest = Net.Webrequest.Create(URL)
        hwrequest.Accept = "*/*"
        hwrequest.AllowAutoRedirect = true
        hwrequest.UserAgent = "http_requester/0.1"
        hwrequest.Timeout = 60000
        hwrequest.Method = method
        If hwrequest.Method = "POST" Then
          hwrequest.ContentType = "application/x-www-form-urlencoded"
          Dim encoding As New Text.ASCIIEncoding() 'Use UTF8Encoding for XML requests
          Dim postByteArray() As Byte = encoding.GetBytes(POSTdata)
          hwrequest.ContentLength = postByteArray.Length
          Dim postStream As IO.Stream = hwrequest.GetRequestStream()
          postStream.Write(postByteArray, 0, postByteArray.Length)
          postStream.Close()
        End If
        Dim hwresponse As Net.HttpWebResponse = hwrequest.GetResponse()
        If hwresponse.StatusCode = Net.HttpStatusCode.OK Then
          Dim responseStream As IO.StreamReader = _
            New IO.StreamReader(hwresponse.GetResponseStream())
          responseData = responseStream.ReadToEnd()
        End If
        hwresponse.Close()
        Catch e As Exception
          responseData = "An error occurred: " & e.Message
        End Try
      Return responseData
End Function

上面的代碼有效並寫出一行...

一些路城市LU1 5QG

返回的Xml是..

<Address xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://site.co.uk/">
  <strOrganisation /> 
  <strProperty /> 
  <strStreet>Some Road</strStreet> 
  <strLocality /> 
  <strTown>City</strTown> 
  <strCounty /> 
  <strPostcode>LU1 5QG</strPostcode> 
  <strDPS /> 

我希望能夠拆分這些字段並將它們設置為頁面上的不同文本框...幫助？

Answer 1

將xml字符串加載到XmlDocument中，並使用XPath提取值：

Dim doc = new XmlDocument()
doc.LoadXml(yourXmlString)
Dim nsm = new XmlNamespaceManager(doc.NameTable)
nsm.AddNamespace("a", "http://site.co.uk/")
txtStreet.Text = doc.SelectSingleNode("/a:Address/a:strStreet", nsm).InnerText

這是一個工作片段：

Dim doc = New XmlDocument()
doc.LoadXml("<Address xmlns:xsd=""http://www.w3.org/2001/XMLSchema"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns=""http://site.co.uk/""><strOrganisation /> <strProperty /> <strStreet>Some Road</strStreet> <strLocality /> <strTown>City</strTown> <strCounty /> <strPostcode>LU1 5QG</strPostcode><strDPS /></Address>")
Dim nsm = New XmlNamespaceManager(doc.NameTable)
nsm.AddNamespace("a", "http://site.co.uk/")
Dim streetValue = doc.SelectSingleNode("/a:Address/a:strStreet", nsm).InnerText

有些事情需要注意：

1. 對於XPath查找，如果xml具有名稱空間，則需要將其添加到從XmlDocument的 NameTable創建的XmlNameSpaceManager中 。
2. 如果您不想這樣做，可以通過doc.ChildNodes[0].ChildNodes[0]等手動遍歷節點集合。

Answer 2

或者嘗試一下，這是我相信作者所要求的。

'使用XML Reader

        Dim xmlDoc = New XmlDocument
        Dim xmlNode As Xml.XmlNode
        xmlDoc.LoadXml(strResponse)

        xmlNode = xmlDoc.SelectSingleNode("//" + "strStreet")

        If Not xmlNode Is Nothing Then
            Dim Street = xmlNode.InnerText
        End If