在读取XML文件时需要帮助 [英] Need help with reading XML files
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问题描述
作为应用程序的一部分，我要通过Met Office的DataPoint服务向用户显示天气和天气预报，我必须读取包含XML格式的天气数据的文件.我已经尝试了好几天了，但是没有成功，所以我想在这里问一下.我需要从中获取特定数据的XML文件是这样的:
As part of an application I am making to display weather and forecasts to the user through the Met Office'' DataPoint service I have to read the files containing the weather data which are in XML format. I have been trying for days to do this and have had no success so I thought I would ask here. The XML file I need to get specific data from is this:
<Layers type="Observation">
<BaseUrl forServiceTimeFormat="Times">
<!--URL goes here-->
</BaseUrl>
<Layer displayName="Lightning">
<Service name="OBSERVATIONS">
<LayerName>ATDNET_Sferics</LayerName>
<ImageFormat>png</ImageFormat>
<Times>
<Time>2013-08-06T13:45:00</Time>
<Time>2013-08-06T13:30:00</Time>
<Time>2013-08-06T13:15:00</Time>
<Time>2013-08-06T13:00:00</Time>
<Time>2013-08-06T12:45:00</Time>
<Time>2013-08-06T12:30:00</Time>
<Time>2013-08-06T12:15:00</Time>
<Time>2013-08-06T12:00:00</Time>
<Time>2013-08-06T11:45:00</Time>
<Time>2013-08-06T11:30:00</Time>
<Time>2013-08-06T11:15:00</Time>
<Time>2013-08-06T11:00:00</Time>
<Time>2013-08-06T10:45:00</Time>
</Times>
</Service>
</Layer>
<Layer displayName="SatelliteIR">
<Service name="OBSERVATIONS">
<LayerName>SATELLITE_Infrared_Fulldisk</LayerName>
<ImageFormat>png</ImageFormat>
<Times>
<Time>2013-08-06T12:00:00</Time>
<Time>2013-08-06T09:00:00</Time>
<Time>2013-08-06T06:00:00</Time>
<Time>2013-08-06T03:00:00</Time>
<Time>2013-08-06T00:00:00</Time>
<Time>2013-08-05T21:00:00</Time>
<Time>2013-08-05T18:00:00</Time>
<Time>2013-08-05T15:00:00</Time>
<Time>2013-08-05T12:00:00</Time>
</Times>
</Service>
</Layer>
<Layer displayName="SatelliteVis">
<Service name="OBSERVATIONS">
<LayerName>SATELLITE_Visible_N_Section</LayerName>
<ImageFormat>png</ImageFormat>
<Times>
<Time>2013-08-06T12:00:00</Time>
<Time>2013-08-06T09:00:00</Time>
<Time>2013-08-06T06:00:00</Time>
<Time>2013-08-06T03:00:00</Time>
<Time>2013-08-06T00:00:00</Time>
<Time>2013-08-05T21:00:00</Time>
<Time>2013-08-05T18:00:00</Time>
<Time>2013-08-05T15:00:00</Time>
<Time>2013-08-05T12:00:00</Time>
</Times>
</Service>
</Layer>
<Layer displayName="Rainfall">
<Service name="OBSERVATIONS">
<LayerName>RADAR_UK_Composite_Highres</LayerName>
<ImageFormat>png</ImageFormat>
<Times>
<Time>2013-08-06T13:45:00</Time>
<Time>2013-08-06T13:30:00</Time>
<Time>2013-08-06T13:15:00</Time>
<Time>2013-08-06T13:00:00</Time>
<Time>2013-08-06T12:45:00</Time>
<Time>2013-08-06T12:30:00</Time>
<Time>2013-08-06T12:15:00</Time>
<Time>2013-08-06T12:00:00</Time>
<Time>2013-08-06T11:45:00</Time>
<Time>2013-08-06T11:30:00</Time>
<Time>2013-08-06T11:15:00</Time>
<Time>2013-08-06T11:00:00</Time>
<Time>2013-08-06T10:45:00</Time>
</Times>
</Service>
</Layer>
</Layers>
所以我的问题是我将如何读取XML文件并将9个特定的SatelliteVis图层/部分的列表放到comboBox中，以便用户从我要从XML读取的那9个时间步中选择一个时间步长?我正在使用Microsoft Visual C#2010用C#编写.非常感谢您能提供给我的任何帮助.
So my question is how would I read the XML file and put the list of the 9 times for specifically the SatelliteVis layer/section into a comboBox for the user to select a time step from those 9 that I would read from the XML? I am writing in C# using Microsoft Visual C# 2010. I would really appreciate any help you can give me.
推荐答案
在.NET FCL中，是不同的XML解析器.这是我对它们的简短概述:
In .NET FCL, there are different XML parsers. This is my short overview of them:
- 使用
System.Xml.XmlDocument类.它实现了DOM接口；如果文档太大，则这种方法最简单，也足够好.
请参见- 使用类
].System.Xml.XmlTextReader; library/system.xml.xmldocument.aspx"target =" _ blank"title =" New Window> ^ - 使用类
- 使用类
System.Xml.XmlTextReader;这是最快的读取方法，尤其是您需要跳过一些数据.
请参见 http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx [ http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx [http://msdn.microsoft.com/en-us/library/bb387063.aspx [
- Use
System.Xml.XmlDocumentclass. It implements DOM interface; this way is the easiest and good enough if the size if the document is not too big.
See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^]. - Use the class
System.Xml.XmlTextReader; this is the fastest way of reading, especially is you need to skip some data.
See http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx[^]. - Use the class
System.Xml.Linq.XDocument; this is the most adequate way similar to that ofXmlDocument, supporting LINQ to XML Programming.
See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx[^], http://msdn.microsoft.com/en-us/library/bb387063.aspx[^].
享受，
Enjoy,
我更喜欢使用XPath来获取Time节点的列表.
尝试以下代码:
I prefer to use XPath to get the list ofTimenodes.
Try this code:
Xml.XmlNodeList xmlNodes;
Xml.XmlDocument xmlDoc = New Xml.XmlDocument();
xmlDoc.LoadXml(strXML); //strXML is a var that contains your xml (that you posted, above)
const string xpathQuery = "/Layers/Layer[@displayName='SatelliteVis']/Service/Times/Time";
xmlNodes = xmlDoc.SelectNodes(xpathQuery);
//iterate through the list of nodes and load your listbox
for (int x = 0; x < xmlNodes.Count; x++)
{
listbox1.add(xmlNodes(x).InnerText);
}
这篇关于在读取XML文件时需要帮助的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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