XML子元素解析

Question

我想从命名空间读取一个值，但它不工作。我正在使用下面的代码将后代传入列表中。

 XDocument doc = XDocument.Parse(QueryParmeterString); 
     XNamespace ns = XNamespace.Get("http://Microsoft.EnterpriseManagement.Core.Criteria/"); 
     var expressions = (from ds in doc.Descendants(ns + "Expression") 
         select ds).ToList(); 


      foreach (var foo in expressions) 
        { 
         string baa = foo.Attributes["ValueExpressionLeft"].Value; 
        } 


    } 

在这一点上，我无法访问每个对象。我需要访问每个属性的值左右值。我有一个强类型的对象，可以存储这些值。

 <Expression xmlns="http://Microsoft.EnterpriseManagement.Core.Criteria/"> 
      <And> 
      <Expression> 
       <SimpleExpression> 
       <ValueExpressionLeft> 
        <Property>$Context/Property[Type='CoreIncident!System.WorkItem.Incident']/TierQueue$</Property> 
       </ValueExpressionLeft> 
       <Operator>Equal</Operator> 
       <ValueExpressionRight> 
        <Value>$MPElement[Name="IncidentTierQueuesEnum.Tier2"]$</Value> 
       </ValueExpressionRight> 
       </SimpleExpression> 
      </Expression> 
      <Expression> 
       <SimpleExpression> 
       <ValueExpressionLeft> 
        <Property>$Context/Property[Type='CoreIncident!System.WorkItem.Incident']/Status$</Property> 
       </ValueExpressionLeft> 
       <Operator>NotEqual</Operator> 
       <ValueExpressionRight> 
        <Value>$MPElement[Name="CoreIncident!IncidentStatusEnum.Resolved"]$</Value> 
       </ValueExpressionRight> 
       </SimpleExpression> 
      </Expression> 
      <Expression> 
       <SimpleExpression> 
       <ValueExpressionLeft> 
        <Property>$Context/Property[Type='CoreIncident!System.WorkItem.Incident']/Status$</Property> 
       </ValueExpressionLeft> 
       <Operator>NotEqual</Operator> 
       <ValueExpressionRight> 
        <Value>$MPElement[Name="CoreIncident!IncidentStatusEnum.Closed"]$</Value> 
       </ValueExpressionRight> 
       </SimpleExpression> 
      </Expression> 
      <Expression> 
       <UnaryExpression> 
       <ValueExpression> 
        <GenericProperty Path="$Context/Path[Relationship='WorkItem!System.WorkItemAssignedToUser' SeedRole='Source']$">Id</GenericProperty> 
       </ValueExpression> 
       <Operator>IsNull</Operator> 
       </UnaryExpression> 
      </Expression> 
      </And> 
     </Expression> 

Answer 1

试试这个，它可以帮助你：

XDocument doc = XDocument.Parse(QueryParmeterString); 
XNamespace ns = XNamespace.Get("http://Microsoft.EnterpriseManagement.Core.Criteria/"); 
var expressions = (from ds in doc.Root.Descendants(ns + "Expression") 
          select ds).ToList(); 

     foreach (var foo in expressions) 
     { 
      XElement expressionTypeElement = foo.FirstNode as XElement; 
      if (expressionTypeElement != null) 
      { 
       if (expressionTypeElement.Name.LocalName == "SimpleExpression") 
       { 
        XElement valueExpressionLeft = expressionTypeElement.Element(ns +"ValueExpressionLeft"); 
        XElement valueExpressionRight = expressionTypeElement.Element(ns +"ValueExpressionRight"); 
        string operator = expressionTypeElement.Element(ns + "Operator").Value; 
        // do your job here 
        //.... 
       } 
       else if (expressionTypeElement.Name.LocalName == "UnaryExpression") 
       { 
        XElement valueExpression = expressionTypeElement.Element(ns +"ValueExpression"); 
        // do your job here 
        //.... 
       } 
      } 
     }