使用XmlDocument进行XML遍历 [英] XML traversing using XmlDocument

问题描述

我有以下代码，可用于遍历XML：

I have the following code, which I use to traverse the XML:

private void btn_readXML_Click(object sender, EventArgs e)
{
        var doc = new XmlDocument();
        doc.Load("e:\\contacts.xml");
        // Load xml document.            
        TraverseNodes(doc.ChildNodes);     
}

static List<string> xmlnodes = new List<string>();
private static void TraverseNodes(XmlNodeList nodes)
{     
       foreach (XmlNode node in nodes)
       {                   
              List<string> temp = new List<string>();                  
              temp.Add("Node name: " + node.Name.ToString());
              XmlAttributeCollection xmlAttributes = node.Attributes;

              foreach (XmlAttribute at in xmlAttributes)
              {
                   temp.Add("  Atrib: " + at.Name + ": " + at.Value);
              }

               xmlnodes.AddRange(temp);
               TraverseNodes(node.ChildNodes);     
}

但是我的问题是，我不想遍历整个文档，我只想遍历具有属性 X的节点及其子节点。请注意，我不知道该节点在哪里。因此，基本上，我要做的就是找出节点是否存在（其属性为 X。这就是我确定其正确节点的方式），如果是，则获取其子节点。

But my problem is, I don't want to traverse the whole document, I only want to traverse the node and subsequently its children which has an attribute 'X'. Please note that I don't know where the node is present. So basically what I have to do is, find out if the node exists ( it'll have the attribute 'X'. That's how I identify its the right node) if yes then fetch its children.

有人可以帮我吗？我刚接触XML。

Can anyone help me out here? I'm pretty new to XMLs. Thanks is advance!

推荐答案

假设您的XML具有以下结构：

Assuming your XML having following structure:

<Contacts>
   <Contact X="abc">
       <Child1></Child1>
   </Contact>

   <Contact X="def">
       <Child2></Child2>
   </Contact>
</Contacts>

使用 XmlNode.SelectNodes ：

var doc = new XmlDocument();
doc.Load("e:\\contacts.xml");

//get root element of document   
XmlElement root = doc.DocumentElement;
//select all contact element having attribute X
XmlNodeList nodeList = root.SelectNodes("//Contact[@X]");
//loop through the nodelist
foreach (XmlNode xNode in nodeList)
{       
    //traverse all childs of the node
}

有关其他 XPath查询，请参见此链接。

更新：

如果要选择文档中所有具有属性 X 的元素。不管它们存在于何处。您可以使用以下命令：

If you want to select all elements having attribute X in the document. No matters where they exists. You could use following:

//select all elements in the doucment having attribute X
XmlNodeList nodeList = root.SelectNodes("//*[@X]");

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