NewXMLNode变为null.如何解决这个问题 [英] NewXMLNode become null.how to solve this

问题描述

在我的asp.net Web应用程序中，我有一个.ashx页面
.ashx页面中的代码是

in my asp.net web application i have a .ashx page
code in .ashx page is

  string  CommonPath = "~/Admin/Content/Dept/Gallery/CSE/gallery.xml";

XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(context.Server.MapPath(CommonPath));//"~/Admin/Content/Activites/Gallery/SportsGallery/gallery.xml"));

                DataSet ds = new DataSet();
                ds.ReadXml(context.Server.MapPath(CommonPath));

                //XmlNode newXMLNode = xmlDoc.SelectSingleNode("/gallery/category[contains(@name,'" + category + "')]");
                string test = "test";
                XmlNode newXMLNode = xmlDoc.SelectSingleNode("/gallery/category[contains(@name,'" + test + "')]");
                XmlNode childnode = xmlDoc.CreateNode(XmlNodeType.Element, "image", "");

这里newXMLNode变为null.如何解决此问题



我的xml是
...................

here newXMLNode become null.how to solve this



my xml is
...................

<?xml version="1.0" standalone="yes"?>
<gallery title="Tony's Photo Album" thumbDir="./images/thumbs/" imageDir="./images/" random="true">
  <category name="MECH">
    <image>
      <date>29/5/2012</date>
      <title>
      </title>
      <desc>
      </desc>
      <thumb>86.jpg</thumb>
      <img>86.jpg</img>
    </image>
    <image>
      <date>29/5/2012</date>
      <title>
      </title>
      <desc>
      </desc>
      <thumb>88.jpg</thumb>
      <img>88.jpg</img>
    </image>
    <image>
      <date>29/5/2012</date>
      <title>
      </title>
      <desc>
      </desc>
      <thumb>90.jpg</thumb>
      <img>90.jpg</img>
    </image>

<category name="test">
    <image>
      <date>3/8/2012</date>
      <title>
      </title>
      <desc>
      </desc>
      <thumb>Winter.jpg</thumb>
      <img>Winter.jpg</img>
    </image>
    <image>
      <date>3/8/2012</date>
      <title>
      </title>
      <desc>
      </desc>
      <thumb>Water lilies.jpg</thumb>
      <img>Water lilies.jpg</img>
    </image>

推荐答案

如果XPath查询的结果为null，则它将为null.没办法解决.

If the result of your XPath query is null, it will be null. There''s no way around that.

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