我如何解析 XML 字符串並檢索特定節點？

Question

我將此變量decodedRequest作為字符串，它具有下面的 XML 值。 我假設我仍然需要將此字符串轉換為 XML 格式。 以及如何獲取 <request_id> 和 <response_id> 標簽以及 <response_message> 標簽中的值？

<?xml version="1.0" encoding="UTF-8"?>
<ServiceResponseWPF xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <application>
      <merchantid>0000011111</merchantid>
      <request_id>456789</request_id>
      <response_id>ASD123</response_id>
      <timestamp>2020-09-23T16:51:47.000000+08:00</timestamp>
      <rebill_id />
      <signature>a246521e3a97bc80502322513434c24d475c4966fe8931b45</signature>
      <ptype>CC</ptype>
   </application>
   <responseStatus>
      <response_code>GR00</response_code>
      <response_message>Successful</response_message>
      <response_advise>Approved</response_advise>
      <processor_response_id>30000</processor_response_id>
      <processor_response_authcode>50001</processor_response_authcode>
   </responseStatus>
   <sub_data />
   <transactionHistory>
      <transaction />
   </transactionHistory>
</ServiceResponseWPF>

Answer 1

所以這有效：

    Dim x As XmlDocument = New XmlDocument()
    x.LoadXml(decodedRequest)

Dim req_id As String = x.SelectSingleNode("/ServiceResponseWPF/application/request_id").InnerText

Dim res_code As String = x.SelectSingleNode("/ServiceResponseWPF/responseStatus/response_code").InnerText