[英]C# xml reader, same element name
I'm trying to read an element from my xml file. 我正在尝试从我的xml文件中读取一个元素。 I need to read an string in an "link" element inside the "metadata", but there are 2 elements called "link", I only need the second one: 我需要在“元数据”中的“link”元素中读取一个字符串,但有2个元素称为“链接”,我只需要第二个:
<metadata>
<name>visit-2015-02-18.gpx</name>
<desc>February 18, 2015. Corn</desc>
<author>
<name>text</name>
<link href="http://snow.traceup.com/me?id=397760"/>
</author>
<link href="http://snow.traceup.com/stats/u?uId=397760&vId=1196854"/>
<keywords>Trace, text</keywords>
I need to read this line: 我需要阅读这一行:
<link href="http://snow.traceup.com/stats/u?uId=397760&vId=1196854"/>
This is the working code for the first "link" tag, it works fine, 这是第一个“链接”标签的工作代码,它工作正常,
public string GetID(string path)
{
string id = "";
XmlReader reader = XmlReader.Create(path);
while (reader.Read())
{
if ((reader.NodeType == XmlNodeType.Element) && (reader.Name == "link"))
{
if (reader.HasAttributes)
{
id = reader.GetAttribute("href");
MessageBox.Show(id + "= first id");
return id;
//id = reader.ReadElementContentAsString();
}
}
}
return id;
}
Does anyone know how I can skip the first "link" element? 有谁知道如何跳过第一个“链接”元素? or check if reader.ReadElementContentAsString() contains "Vid" or something like that? 或检查reader.ReadElementContentAsString()是否包含“Vid”或类似的内容?
I hope you can help me. 我希望你能帮助我。
xpath is the answer :) xpath就是答案:)
XmlReader reader = XmlReader.Create(path);
XmlDocument doc = new XmlDocument();
doc.Load(reader);
XmlNodeList nodes = doc.SelectNodes("metadata/link");
foreach(XmlNode node in nodes)
Console.WriteLine(node.Attributes["href"].Value);
Use the String.Contains method to check if the string contains the desired substring, in this case vId
: 使用String.Contains方法检查字符串是否包含所需的子字符串,在本例中为vId
:
public string GetID(string path)
{
XmlReader reader = XmlReader.Create(path);
while (reader.Read())
{
if ((reader.NodeType == XmlNodeType.Element) && (reader.Name == "link"))
{
if (reader.HasAttributes)
{
var id = reader.GetAttribute("href");
if (id.Contains(@"&vId"))
{
MessageBox.Show(id + "= correct id");
return id;
}
}
}
return String.Empty;
}
If acceptable you can also use LINQ2XML : 如果可以接受,您也可以使用LINQ2XML :
var reader = XDocument.Load(path); // or XDocument.Parse(path);
// take the outer link
Console.WriteLine(reader.Root.Element("link").Attribute("href").Value);
The output is always: 输出总是:
http://snow.traceup.com/stats/u?uId=397760&vId=1196854= first id
Another options is to use XPath like @user5507337 suggested. 另一个选择是使用像@ user5507337建议的XPath。
XDocument example: XDocument示例:
var xml = XDocument.Load(path); //assuming path points to file
var nodes = xml.Root.Elements("link");
foreach(var node in nodes)
{
var href = node.Attribute("href").Value;
}
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