C# xml SelectSingleNode 问题

[tyzyx]

XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(@"<students>
                                  <student pkid='111'>
                                     <name>aaa</name>
                                     <age>22</age>
                                  </student>
                                  <student pkid='222'>
                                     <name>bbb</name>
                                     <age>24</age>
                                  </student>
                                </students>"
                );
            XmlNode node = xmlDoc.SelectSingleNode("students/student[@pkid='222']");
            if (node != null)
            {
                Console.WriteLine(node.FirstChild.InnerText); //return bbb;
            }

以上代码可以正常查找到student pkid 为 222的结点
但是如果XML文件格式如下：注意 <student pkid='222'>变为 <student pkid="222">，如何使用SelectSingleNode定位？

"                            <students>
                                  <student pkid="111">
                                     <name>aaa</name>
                                     <age>22</age>
                                  </student>
                                  <student pkid="222">
                                     <name>bbb</name>
                                     <age>24</age>
                                  </student>
                                </students>"

[黑脚印_DarkSpoor]

有区别吗？

[zgke]

XmlNode node = xmlDoc.SelectSingleNode("students/student[@pkid=\"222\"]");

[易企加_天马行空]

应该一样的吧。。。

[黑脚印_DarkSpoor]

<student pkid='222'>变为 <student pkid="222">

xpath的定义都是一样的。

他们的区别是字符串里的"要转义一下。 \"

[sunshine_anycall]

xpath参数变一下就可以

[Jock.Chen]

同意2楼.

[g394594141]

估计2楼的可以

[LQknife]

用XmlNode node = xmlDoc.SelectSingleNode("students/student[@pkid='222']");
这个在检验一次就知道是不是一样了

[whowhen21]

楼上有解了，用个转义字符来区分啊

[robin521]

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml;


public partial class XML示例 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {


    }
}
public class XmlProvider : IDisposable
{
    private string a;
    private XmlDocument b;
    public XmlProvider(string XmlFile)
    {
        try
        {
            this.b = new XmlDocument();
            this.b.Load(XmlFile);
        }
        catch
        {
           
        }
        this.a = XmlFile;

    }
    public void DeleteNode(string NodeName)
    {
        string xpath = NodeName.Substring(0,NodeName.LastIndexOf("/"));
        this.b.SelectSingleNode(xpath).RemoveChild(this.b.SelectSingleNode(NodeName));
    }
    public void Dispose()
    {
        this.Dispose(true);
    }
    protected void Dispose(bool Diposing)
    {
        this.b = null;
        
    }
    public void InsetElement(string mainNode, string element, string content)
    {

        XmlNode node = this.b.SelectSingleNode(mainNode);
        XmlElement newChild = this.b.CreateElement(element);
        newChild.InnerText = content;
        node.AppendChild(newChild);

       
    }
    public void InsertElement(string mainNode, string  element, string attrib, string attribConte, string content)
    {
        XmlNode node = this.b.SelectSingleNode(mainNode);
        XmlElement newChild = this.b.CreateElement(element);
        newChild.SetAttribute(attrib, attribConte);
        newChild.InnerText = content;
        node.AppendChild(newChild);

    }
    public void InsertNode(string mainNode, string childNode, string element, string contents)
    {

        XmlNode node = this.b.SelectSingleNode(mainNode);
        XmlElement newChild = this.b.CreateElement(childNode);
        node.AppendChild(newChild);
        XmlElement element3 = this.b.CreateElement(element);
        element3.InnerText = contents;
        newChild.AppendChild(element3);

    }
    public string ReadAtribute(string PathNode, string AttubuteName)
    {
        string str = "";
        try
        {
            str = this.b.SelectSingleNode(PathNode).Attributes[AttubuteName].Value;
        }
        catch
        {
           
        }
        return str;
    }
    public string ReadInnerText(string PathNode)
    {
        return this.b.SelectSingleNode(PathNode).InnerText;
    }
    public XmlNode ReadNode(string PathNode)
    {
        return this.b.SelectSingleNode(PathNode);
    }
    public void Save()
    {
        try
        {
            this.b.Save(this.a);
        }
        catch
        {

        }
        this.b = null; 
    }
    public void UpdateAttribute(string PathNode, string AttributeName, int AttributeValue)
    {
        this.b.SelectSingleNode(PathNode).Attributes[AttributeName].Value = AttributeValue;
    }
    public void UpdateInnerText(string PathNode, string InnerText)
    {
        this.b.SelectSingleNode(PathNode).InnerText = InnerText;
    }

}