如何从 XML 字符串中检索查询参数和名称值

Question

我将如何解析以下内容，它至少不会改变行的布局。所以我需要能够获取查询参数值，即 TypeProjectionId 以及 Name=? 的值。有人有什么想法吗？

我正在使用它从 xml 文件中获取文本。

                string path = "/View/Data/ItemsSource";
                XmlNodeList nodeList = currentDocument.SelectNodes(path);
                IDictionary<string, string> keyValuePairList = new Dictionary<string, string>();
                string itemsource;
                itemsource = "";
                foreach (XmlNode node in nodeList)
                {

                    itemsource = node.InnerXml;
                     //   keyValuePairList.Add(new KeyValuePair<string, string>(node.Attributes[0].Value, node.Attributes[0].Value));

                }

itemsource的结果

    <AdvancedListSupportClass xmlns=\"clr-namespace:Microsoft.EnterpriseManagement.UI.ViewFramework;assembly=Microsoft.EnterpriseManagement.UI.ViewFramework\" xmlns:av=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" xmlns:x=\"http://schemas.microsoft.com/winfx/2006/xaml\" xmlns:s=\"clr-namespace:System;assembly=mscorlib\" DataTypeName=\"\" AdapterName=\"viewframework://Adapters/AdvancedList\" FullUpdateAdapter=\"dataportal:EnterpriseManagementObjectProjectionAdapter\" DataSource=\"mom:ManagementGroup\" IsRecurring=\"True\" RecurrenceFrequency=\"{x:Static s:Int32.MaxValue}\" FullUpdateFrequency=\"1\" Streaming=\"true\">
      <AdvancedListSupportClass.Parameters>
        <QueryParameter Parameter=\"TypeProjectionId\" Value=\"$MPElement[Name='System.WorkItem.Incident.View.ProjectionType']$\" />
      </AdvancedListSupportClass.Parameters>
    </AdvancedListSupportClass> 

Answer 1

您的 XML 具有默认命名空间，因此您需要使用 XmlNamespaceManager 才能使用 XPath 查询 XML。例如，要获取Parameter 属性的值，您可以执行以下操作：

XmlNamespaceManager nsManager = new XmlNamespaceManager(new NameTable());

//register ns prefix to point to default namespace 
nsManager.AddNamespace("ns", node.FirstChild.GetNamespaceOfPrefix(""));

//use the namespace manager and registered prefix to get desired element
string xpath = "/ns:AdvancedListSupportClass/ns:AdvancedListSupportClass.Parameters/ns:QueryParameter";
var queryParameters = node.SelectNodes(xpath, nsManager);

foreach(XmlNode queryParameter in queryParameters)
{
    //get value of Parameter attribute of each <QueryParameter>
    Console.WriteLine(queryParameter.Attributes["Parameter"].Value);
}