Question

我发布到网站上以获取数据。该站点将其作为xml返回。我能够将数据转换为字符串。但我真正想做的是将xml中的每个项目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

以上代码有效并写出一行......

一些道路城市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 />

我希望能够拆分这些字段并将它们设置为页面上的不同文本框...帮助？

Answer 1

将xml字符串加载到XmlDocument并使用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

这是一个工作片段：

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

有些注意事项：

对于XPath查找，如果您的xml具有命名空间，则需要将其添加到 XmlNameSpaceManager创建了XmlDocument's NameTable。
如果你不想麻烦的是，您可以通过手动遍历节点集合 doc.ChildNodes[0].ChildNodes[0]等。

Answer 2

或试试这个，这是我认为作者所要求的。

'使用XML阅读器

        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

如何从vb.net中的帖子解析xml响应

2 个答案: