c#

qlzf11140820 2009-01-06 11:20:36

我的代码
private void loadhtml()
{
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(Application.StartupPath + ("~doc.xml"));
XmlNodeList mynodelist;
XmlElement root = xmlDocument.DocumentElement;
mynodelist = xmlDocument.SelectNodes("/rss/channel/item");
int i = 0;
bool j;
string content = "";
StatusBar1.Text = "正在读取文章内容...";
i = listBox1.SelectedIndex;
label2.Text=listBox1.SelectedIndex.ToString();
if (content != null)
{

content = content + "<html><head><meta http-equiv='content-type' content='text/html;charset=UTF-8'></head><body>";
content = content + "<table width='100%' height='80' bgcolor='#eeeeee'><tr><td><b>标题：</b><a href='";
mynodelist = root.GetElementsByTagName("link");
content = content + mynodelist.Item(i).InnerXml;
content = content + "' target='_blank'>";
mynodelist = root.GetElementsByTagName("title");
content = content + mynodelist.Item(i).InnerXml;
content = content + "</tb></tr></table>";
mynodelist = root.GetElementsByTagName("description");
content = content + mynodelist.Item(i).InnerXml; content = content + "</body></html>";

}
j = SaveTextFile(Application.StartupPath + "~temp.html", content);
webBrowser1.Navigate(Application.StartupPath + "~temp.html");
StatusBar1.Text = "完成";
}

当我listbox.SelectedIndex到最后一项时报错！！”未将对象引用到实例“
报错地址：“content = content + mynodelist.Item(i).InnerXml;”

高手指教？？？

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qlzf11140820 2009-01-06

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[Quote=引用 1 楼 zhuanshen712 的回复:]
1:mynodelist = root.GetElementsByTagName("description");
2:content = content + mynodelist.Item(i).InnerXml;
========
第一句已经把mynodelist改变了，怎么还用Item(i)?
[/Quote]

content = content + mynodelist.Item(i).InnerXml;改怎么改呢？错误就在这里！！

zhuanshen712 2009-01-06

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这个i是什么？
每个GetElementsByTagName得到的个数可能不一样。i = listBox1.SelectedIndex; 这可能listBox1.SelectedIndex〉GetElementsByTagName得到的个数啊。

zhuanshen712 2009-01-06

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1:mynodelist = root.GetElementsByTagName("description");
2:content = content + mynodelist.Item(i).InnerXml;
========
第一句已经把mynodelist改变了，怎么还用Item(i)?

LorenLiu 2009-01-06

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在content = content + mynodelist.Item(i).InnerXml;之前你判断一下mynodelist是不是为null
我觉得可能mynodelist = root.GetElementsByTagName("description"); 得到的mynodelist是null

qlzf11140820 2009-01-06