blocks|key|3122383|text|使用XmlReader解析大型XML文档。XmlReader提供了对XML数据的快速、只向前、非缓存访问。(仅向前意味着您可以从头到尾读取XML文件，但不能在文件中向后移动。)+XmlReader使用少量内存，相当于使用简单的SAX阅读器。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3122384|++++using+(XmlReader+myReader+=+XmlReader.Create(@"c:\data\coords.xml"))
++++{
++++++++while+(myReader.Read())
++++++++{
+++++++++++//+Process+each+node+(myReader.Value)+here
+++++++++++//+...
++++++++}
++++}|code-block|syntax|javascript|3122385|您可以使用XmlReader处理最大为2+GB的文件。|3122386|参考：How+to+read+XML+from+a+file+by+using+Visual+C#|3122387|entityMap|0|LINK|mutability|MUTABLE|url|http://support.microsoft.com/kb/307548^0|2|9|L|9|2H|9|0|0|0|3|1A|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|O|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

Use <code>XmlReader</code> to parse large XML documents. <code>XmlReader</code> provides fast, forward-only, non-cached access to XML data. (Forward-only means you can read the XML file from beginning to end but cannot move backwards in the file.) <code>XmlReader</code> uses small amounts of memory, and is equivalent to using a simple SAX reader.

<pre><code> using (XmlReader myReader = XmlReader.Create(@"c:\data\coords.xml"))
 {
 while (myReader.Read())
 {
 // Process each node (myReader.Value) here
 // ...
 }
 }
</code></pre>

You can use XmlReader to process files that are up to 2 gigabytes (GB) in size. 

Ref: <a href="http://support.microsoft.com/kb/307548" rel="noreferrer">How to read XML from a file by using Visual C#</a>

blocks|key|3335330|text|SAX解析器可能就是您要找的。SAX不要求您将整个文档读取到内存中-它会递增地解析整个文档，并允许您在执行过程中处理元素。我不知道.NET中是否提供了SAX解析器，但是您可以查看一些开源选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3335331|3335332|http://saxdotnet.sourceforge.net/|unordered-list-item|3335333|http://www.codeguru.com/csharp/csharp/cs_data/xml/article.php/c4221|3335334|3335335|这里有一个相关的帖子：|3335336|3335337|SAX+vs+XmlTextReader+-+SAX+in+C#|3335338|3335339|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Simple_API_for_XML|1|2|3|https://stackoverflow.com/questions/127869/sax-vs-xmltextreader-sax-in-c^0|0|3|0|0|0|0|X|1|0|0|1V|2|0|0|0|0|0|W|3|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|-4|5|6|7|16|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|H|3|I|5|G|7|1B|8|@]|9|@$A|1C|B|1D|1|1E]]|C|$]]|$1|J|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1G|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]|$1|N|3|O|5|G|7|1I|8|@]|9|@$A|1J|B|1K|1|1L]]|C|$]]|$1|P|3|-4|5|6|7|1M|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1N|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|F]]|Z|$5|T|U|V|C|$W|I]]|10|$5|T|U|V|C|$W|11]]]]

A <a href="http://en.wikipedia.org/wiki/Simple_API_for_XML" rel="nofollow noreferrer">SAX</a> parser might be what you're looking for. SAX does not require you to read the entire document into memory - it parses through it incrementally and allows you to process the elements as you go. I don't know if there is a SAX parser provided in .NET, but there are a few opensource options that you could look at:

<ul>
<li><a href="http://saxdotnet.sourceforge.net/" rel="nofollow noreferrer">http://saxdotnet.sourceforge.net/</a></li>
<li><a href="http://www.codeguru.com/csharp/csharp/cs_data/xml/article.php/c4221" rel="nofollow noreferrer">http://www.codeguru.com/csharp/csharp/cs_data/xml/article.php/c4221</a></li>
</ul>

Here's a related post:

<ul>
<li><a href="https://stackoverflow.com/questions/127869/sax-vs-xmltextreader-sax-in-c">SAX vs XmlTextReader - SAX in C#</a></li>
</ul>

blocks|key|346229|text|总而言之，对于任何在google中找到这个帖子的人来说，答案都会更明显一些。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|346230|在XML2之前，XmlTextReader是标准.NET中内存效率最高的解析器(thanx+Mitch;-)|346231|.NET+2引入了XmlReader类，这个类更好，它是一个只向前元素迭代器(有点像StAX解析器)。(感谢Cerebrus;-)|346232|孩子们，记住，任何XML实例都有可能超过500k，不要使用DOM！|346233|干杯。基思。|346234|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

Just to summarise, and make the answer a bit more obvious for anyone who finds this thread in google.

Prior to .NET 2 the XmlTextReader was the most memory efficient XML parser available in the standard API (thanx Mitch;-)

.NET 2 introduced the XmlReader class which is better again It's a forward-only element iterator (a bit like a StAX parser). (thanx Cerebrus;-)

And remember kiddies, of any XML instance has the potential to be bigger than about 500k, DON'T USE DOM!

Cheers all. Keith.

blocks|key|3122495|text|Asat+14+2009年5月14日:我已经切换到使用混合方法...请参阅下面的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3122496|此版本具有这两个版本的大多数优点：|3122497|*+XmlReader/XmlTextReader+(内存效率-->速度)；以及|3122498|*+XmlSerializer+(代码生成-->开发的方便性和灵活性)。|3122499|它使用XmlTextReader遍历文档，并创建“doclet”，并使用XSD.EXE生成的XmlSerializer和"XML+binding“类对其进行反序列化。|3122500|我猜这个食谱是普遍适用的，而且它很快...我在大约7秒内解析了一个包含56,000个GML特征的201+MB+XML文档……这个应用程序的旧VB6实现需要几分钟(甚至几个小时)来解析大型摘录……所以我看起来可以走了。|3122501|再一次，a+BIG感谢论坛贡献您的宝贵时间。我真的很感激。|offset|length|style|BOLD|3122502|干杯。基思。|3122503|using+System;
using+System.Reflection;
using+System.Xml;
using+System.Xml.Serialization;
using+System.IO;
using+System.Collections.Generic;

using+nrw_rime_extract.utils;
using+nrw_rime_extract.xml.generated_bindings;

namespace+nrw_rime_extract.xml
{
++++internal+interface+ExtractXmlReader
++++{
++++++++rimeType+read(string+xmlFilename);
++++}

++++///+<summary>
++++///+RimeExtractXml+provides+bindings+to+the+RIME+Extract+XML+as+defined+by
++++///+$/Release+2.7/Documentation/Technical/SCHEMA+and+DTDs/nrw-rime-extract.xsd
++++///+</summary>
++++internal+class+ExtractXmlReader_XmlSerializerImpl+:+ExtractXmlReader
++++{
++++++++private+Log+log+=+Log.getInstance();

++++++++public+rimeType+read(string+xmlFilename)
++++++++{
++++++++++++log.write(
++++++++++++++++string.Format(
++++++++++++++++++++"DEBUG:+ExtractXmlReader_XmlSerializerImpl.read({0})",
++++++++++++++++++++xmlFilename));
++++++++++++using+(Stream+stream+=+new+FileStream(xmlFilename,+FileMode.Open))
++++++++++++{
++++++++++++++++return+read(stream);
++++++++++++}
++++++++}

++++++++internal+rimeType+read(Stream+xmlInputStream)
++++++++{
++++++++++++//+create+an+instance+of+the+XmlSerializer+class,+
++++++++++++//+specifying+the+type+of+object+to+be+deserialized.
++++++++++++XmlSerializer+serializer+=+new+XmlSerializer(typeof(rimeType));
++++++++++++serializer.UnknownNode+%2B=+new+XmlNodeEventHandler(handleUnknownNode);
++++++++++++serializer.UnknownAttribute+%2B=+
++++++++++++++++new+XmlAttributeEventHandler(handleUnknownAttribute);
++++++++++++//+use+the+Deserialize+method+to+restore+the+object's+state
++++++++++++//+with+data+from+the+XML+document.
++++++++++++return+(rimeType)serializer.Deserialize(xmlInputStream);
++++++++}

++++++++protected+void+handleUnknownNode(object+sender,+XmlNodeEventArgs+e)
++++++++{
++++++++++++log.write(
++++++++++++++++string.Format(
++++++++++++++++++++"XML_ERROR:+Unknown+Node+at+line+{0}+position+{1}+:+{2}\t{3}",
++++++++++++++++++++e.LineNumber,+e.LinePosition,+e.Name,+e.Text));
++++++++}

++++++++protected+void+handleUnknownAttribute(object+sender,+XmlAttributeEventArgs+e)
++++++++{
++++++++++++log.write(
++++++++++++++++string.Format(
++++++++++++++++++++"XML_ERROR:+Unknown+Attribute+at+line+{0}+position+{1}+:+{2}='{3}'",
++++++++++++++++++++e.LineNumber,+e.LinePosition,+e.Attr.Name,+e.Attr.Value));
++++++++}

++++}

++++///+<summary>
++++///+xtractXmlReader+provides+bindings+to+the+extract.xml+
++++///+returned+by+the+RIME+server;+as+defined+by:
++++///+++$/Release+X/Documentation/Technical/SCHEMA+and+
++++///+DTDs/nrw-rime-extract.xsd
++++///+</summary>
++++internal+class+ExtractXmlReader_XmlTextReaderXmlSerializerHybridImpl+:
++++++++ExtractXmlReader
++++{
++++++++private+Log+log+=+Log.getInstance();

++++++++public+rimeType+read(string+xmlFilename)
++++++++{
++++++++++++log.write(
++++++++++++++++string.Format(
++++++++++++++++++++"DEBUG:+ExtractXmlReader_XmlTextReaderXmlSerializerHybridImpl."+%2B
++++++++++++++++++++"read({0})",
++++++++++++++++++++xmlFilename));

++++++++++++using+(XmlReader+reader+=+XmlReader.Create(xmlFilename))
++++++++++++{
++++++++++++++++return+read(reader);
++++++++++++}

++++++++}

++++++++public+rimeType+read(XmlReader+reader)
++++++++{
++++++++++++rimeType+result+=+new+rimeType();
++++++++++++//+a+deserializer+for+featureClass,+feature,+etc,+"doclets"
++++++++++++Dictionary<Type,+XmlSerializer>+serializers+=+
++++++++++++++++new+Dictionary<Type,+XmlSerializer>();
++++++++++++serializers.Add(typeof(featureClassType),+
++++++++++++++++newSerializer(typeof(featureClassType)));
++++++++++++serializers.Add(typeof(featureType),+
++++++++++++++++newSerializer(typeof(featureType)));

++++++++++++List<featureClassType>+featureClasses+=+new+List<featureClassType>();
++++++++++++List<featureType>+features+=+new+List<featureType>();
++++++++++++while+(!reader.EOF)
++++++++++++{
++++++++++++++++if+(reader.MoveToContent()+!=+XmlNodeType.Element)
++++++++++++++++{
++++++++++++++++++++reader.Read();+//+skip+non-element-nodes+and+unknown-elements.
++++++++++++++++++++continue;
++++++++++++++++}

++++++++++++++++//+skip+junk+nodes.
++++++++++++++++if+(reader.Name.Equals("featureClass"))
++++++++++++++++{
++++++++++++++++++++using+(
++++++++++++++++++++++++StringReader+elementReader+=
++++++++++++++++++++++++++++new+StringReader(reader.ReadOuterXml()))
++++++++++++++++++++{
++++++++++++++++++++++++XmlSerializer+deserializer+=
++++++++++++++++++++++++++++serializers[typeof+(featureClassType)];
++++++++++++++++++++++++featureClasses.Add(
++++++++++++++++++++++++++++(featureClassType)
++++++++++++++++++++++++++++deserializer.Deserialize(elementReader));
++++++++++++++++++++}
++++++++++++++++++++continue;
++++++++++++++++++++//+ReadOuterXml+advances+the+reader,+so+don't+read+again.
++++++++++++++++}

++++++++++++++++if+(reader.Name.Equals("feature"))
++++++++++++++++{
++++++++++++++++++++using+(
++++++++++++++++++++++++StringReader+elementReader+=
++++++++++++++++++++++++++++new+StringReader(reader.ReadOuterXml()))
++++++++++++++++++++{
++++++++++++++++++++++++XmlSerializer+deserializer+=
++++++++++++++++++++++++++++serializers[typeof+(featureType)];
++++++++++++++++++++++++features.Add(
++++++++++++++++++++++++++++(featureType)
++++++++++++++++++++++++++++deserializer.Deserialize(elementReader));
++++++++++++++++++++}
++++++++++++++++++++continue;
++++++++++++++++++++//+ReadOuterXml+advances+the+reader,+so+don't+read+again.
++++++++++++++++}

++++++++++++++++log.write(
++++++++++++++++++++"WARNING:+unknown+element+'"+%2B+reader.Name+%2B
++++++++++++++++++++"'+was+skipped+during+parsing.");
++++++++++++++++reader.Read();+//+skip+non-element-nodes+and+unknown-elements.
++++++++++++}
++++++++++++result.featureClasses+=+featureClasses.ToArray();
++++++++++++result.features+=+features.ToArray();
++++++++++++return+result;
++++++++}

++++++++private+XmlSerializer+newSerializer(Type+elementType)
++++++++{
++++++++++++XmlSerializer+serializer+=+new+XmlSerializer(elementType);
++++++++++++serializer.UnknownNode+%2B=+new+XmlNodeEventHandler(handleUnknownNode);
++++++++++++serializer.UnknownAttribute+%2B=+
++++++++++++++++new+XmlAttributeEventHandler(handleUnknownAttribute);
++++++++++++return+serializer;
++++++++}

++++++++protected+void+handleUnknownNode(object+sender,+XmlNodeEventArgs+e)
++++++++{
++++++++++++log.write(
++++++++++++++++string.Format(
++++++++++++++++++++"XML_ERROR:+Unknown+Node+at+line+{0}+position+{1}+:+{2}\t{3}",
++++++++++++++++++++e.LineNumber,+e.LinePosition,+e.Name,+e.Text));
++++++++}

++++++++protected+void+handleUnknownAttribute(object+sender,+XmlAttributeEventArgs+e)
++++++++{
++++++++++++log.write(
++++++++++++++++string.Format(
++++++++++++++++++++"XML_ERROR:+Unknown+Attribute+at+line+{0}+position+{1}+:+{2}='{3}'",
++++++++++++++++++++e.LineNumber,+e.LinePosition,+e.Attr.Name,+e.Attr.Value));
++++++++}
++++}
}|code-block|syntax|javascript|3122504|entityMap^0|0|0|0|0|0|0|6|3|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|16|8|@$N|17|O|18|P|Q]]|9|@]|A|$]]|$1|R|3|S|5|6|7|19|8|@]|9|@]|A|$]]|$1|T|3|U|5|V|7|1A|8|@]|9|@]|A|$W|X]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

Asat 14 May 2009: I've switched to using a hybrid approach... see code below. 

This version has most of the advantages of both: 
&nbsp;&nbsp;* the XmlReader/XmlTextReader (memory efficiency --> speed); and 
&nbsp;&nbsp;* the XmlSerializer (code-gen --> development expediancy and flexibility). 

It uses the XmlTextReader to iterate through the document, and creates "doclets" which it deserializes using the XmlSerializer and "XML binding" classes generated with XSD.EXE.

I guess this recipe is universally applicable, and it's fast... I'm parsing a 201 MB XML Document containing 56,000 GML Features in about 7 seconds... the old VB6 implementation of this application took minutes (or even hours) to parse large extracts... so I'm lookin' good to go.

Once again, a BIG Thank You to the forumites for donating your valuable time. I really appreciate it.

Cheers all. Keith.

<pre><code>using System;
using System.Reflection;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Collections.Generic;

using nrw_rime_extract.utils;
using nrw_rime_extract.xml.generated_bindings;

namespace nrw_rime_extract.xml
{
 internal interface ExtractXmlReader
 {
 rimeType read(string xmlFilename);
 }

 /// &lt;summary&gt;
 /// RimeExtractXml provides bindings to the RIME Extract XML as defined by
 /// $/Release 2.7/Documentation/Technical/SCHEMA and DTDs/nrw-rime-extract.xsd
 /// &lt;/summary&gt;
 internal class ExtractXmlReader_XmlSerializerImpl : ExtractXmlReader
 {
 private Log log = Log.getInstance();

 public rimeType read(string xmlFilename)
 {
 log.write(
 string.Format(
 "DEBUG: ExtractXmlReader_XmlSerializerImpl.read({0})",
 xmlFilename));
 using (Stream stream = new FileStream(xmlFilename, FileMode.Open))
 {
 return read(stream);
 }
 }

 internal rimeType read(Stream xmlInputStream)
 {
 // create an instance of the XmlSerializer class, 
 // specifying the type of object to be deserialized.
 XmlSerializer serializer = new XmlSerializer(typeof(rimeType));
 serializer.UnknownNode += new XmlNodeEventHandler(handleUnknownNode);
 serializer.UnknownAttribute += 
 new XmlAttributeEventHandler(handleUnknownAttribute);
 // use the Deserialize method to restore the object's state
 // with data from the XML document.
 return (rimeType)serializer.Deserialize(xmlInputStream);
 }

 protected void handleUnknownNode(object sender, XmlNodeEventArgs e)
 {
 log.write(
 string.Format(
 "XML_ERROR: Unknown Node at line {0} position {1} : {2}\t{3}",
 e.LineNumber, e.LinePosition, e.Name, e.Text));
 }

 protected void handleUnknownAttribute(object sender, XmlAttributeEventArgs e)
 {
 log.write(
 string.Format(
 "XML_ERROR: Unknown Attribute at line {0} position {1} : {2}='{3}'",
 e.LineNumber, e.LinePosition, e.Attr.Name, e.Attr.Value));
 }

 }

 /// &lt;summary&gt;
 /// xtractXmlReader provides bindings to the extract.xml 
 /// returned by the RIME server; as defined by:
 /// $/Release X/Documentation/Technical/SCHEMA and 
 /// DTDs/nrw-rime-extract.xsd
 /// &lt;/summary&gt;
 internal class ExtractXmlReader_XmlTextReaderXmlSerializerHybridImpl :
 ExtractXmlReader
 {
 private Log log = Log.getInstance();

 public rimeType read(string xmlFilename)
 {
 log.write(
 string.Format(
 "DEBUG: ExtractXmlReader_XmlTextReaderXmlSerializerHybridImpl." +
 "read({0})",
 xmlFilename));

 using (XmlReader reader = XmlReader.Create(xmlFilename))
 {
 return read(reader);
 }

 }

 public rimeType read(XmlReader reader)
 {
 rimeType result = new rimeType();
 // a deserializer for featureClass, feature, etc, "doclets"
 Dictionary&lt;Type, XmlSerializer&gt; serializers = 
 new Dictionary&lt;Type, XmlSerializer&gt;();
 serializers.Add(typeof(featureClassType), 
 newSerializer(typeof(featureClassType)));
 serializers.Add(typeof(featureType), 
 newSerializer(typeof(featureType)));

 List&lt;featureClassType&gt; featureClasses = new List&lt;featureClassType&gt;();
 List&lt;featureType&gt; features = new List&lt;featureType&gt;();
 while (!reader.EOF)
 {
 if (reader.MoveToContent() != XmlNodeType.Element)
 {
 reader.Read(); // skip non-element-nodes and unknown-elements.
 continue;
 }

 // skip junk nodes.
 if (reader.Name.Equals("featureClass"))
 {
 using (
 StringReader elementReader =
 new StringReader(reader.ReadOuterXml()))
 {
 XmlSerializer deserializer =
 serializers[typeof (featureClassType)];
 featureClasses.Add(
 (featureClassType)
 deserializer.Deserialize(elementReader));
 }
 continue;
 // ReadOuterXml advances the reader, so don't read again.
 }

 if (reader.Name.Equals("feature"))
 {
 using (
 StringReader elementReader =
 new StringReader(reader.ReadOuterXml()))
 {
 XmlSerializer deserializer =
 serializers[typeof (featureType)];
 features.Add(
 (featureType)
 deserializer.Deserialize(elementReader));
 }
 continue;
 // ReadOuterXml advances the reader, so don't read again.
 }

 log.write(
 "WARNING: unknown element '" + reader.Name +
 "' was skipped during parsing.");
 reader.Read(); // skip non-element-nodes and unknown-elements.
 }
 result.featureClasses = featureClasses.ToArray();
 result.features = features.ToArray();
 return result;
 }

 private XmlSerializer newSerializer(Type elementType)
 {
 XmlSerializer serializer = new XmlSerializer(elementType);
 serializer.UnknownNode += new XmlNodeEventHandler(handleUnknownNode);
 serializer.UnknownAttribute += 
 new XmlAttributeEventHandler(handleUnknownAttribute);
 return serializer;
 }

 protected void handleUnknownNode(object sender, XmlNodeEventArgs e)
 {
 log.write(
 string.Format(
 "XML_ERROR: Unknown Node at line {0} position {1} : {2}\t{3}",
 e.LineNumber, e.LinePosition, e.Name, e.Text));
 }

 protected void handleUnknownAttribute(object sender, XmlAttributeEventArgs e)
 {
 log.write(
 string.Format(
 "XML_ERROR: Unknown Attribute at line {0} position {1} : {2}='{3}'",
 e.LineNumber, e.LinePosition, e.Attr.Name, e.Attr.Value));
 }
 }
}
</code></pre>

blocks|key|347172|text|我只是想添加这个简单的扩展方法作为使用XmlReader的示例(正如米奇回答的那样)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|347173|public+static+bool+SkipToElement+(this+XmlReader+xmlReader,+string+elementName)
{
++++if+(!xmlReader.Read+())
++++++++return+false;

++++while+(!xmlReader.EOF)
++++{
++++++++if+(xmlReader.NodeType+==+XmlNodeType.Element+&&+xmlReader.Name+==+elementName)
++++++++++++return+true;

++++++++xmlReader.Skip+();
++++}

++++return+false;
}|code-block|syntax|javascript|347174|和用法：|347175|using+(var+xml_reader+=+XmlReader.Create+(this.source.Url))
{
++++if+(!SkipToElement+(xml_reader,+"Root"))
++++++++throw+new+InvalidOperationException+("XML+element+\"Root\"+was+not+found.");

++++if+(!SkipToElement+(xml_reader,+"Users"))
++++++++throw+new+InvalidOperationException+("XML+element+\"Root/Users\"+was+not+found.");

++++...
}|347176|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Just wanted to add this simple extension method as an example of using XmlReader (as Mitch answered):

<pre><code>public static bool SkipToElement (this XmlReader xmlReader, string elementName)
{
 if (!xmlReader.Read ())
 return false;

 while (!xmlReader.EOF)
 {
 if (xmlReader.NodeType == XmlNodeType.Element &amp;&amp; xmlReader.Name == elementName)
 return true;

 xmlReader.Skip ();
 }

 return false;
}
</code></pre>

And usage:

<pre><code>using (var xml_reader = XmlReader.Create (this.source.Url))
{
 if (!SkipToElement (xml_reader, "Root"))
 throw new InvalidOperationException ("XML element \"Root\" was not found.");

 if (!SkipToElement (xml_reader, "Users"))
 throw new InvalidOperationException ("XML element \"Root/Users\" was not found.");

 ...
}
</code></pre>

I'm writing a GIS client tool in C# to retrieve "features" in a GML-based XML schema (sample below) from a server. Extracts are limited to 100,000 features.

I guestimate that the largest extract.xml might get up around 150 megabytes, so obviously DOM parsers are out I've been trying to decide between <a href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer.aspx" rel="noreferrer" title="XmlSerializer">XmlSerializer</a> and <a href="http://msdn.microsoft.com/en-us/library/x6c1kb0s.aspx" rel="noreferrer" title="XSD.EXE - Visual Studio XML-schema-binder generator tool">XSD.EXE</a> generated bindings --OR-- <a href="http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx" rel="noreferrer" title="XmlReader class">XmlReader</a> and a hand-crafted object graph.

Or maybe there's a better way which I haven't considered yet? Like XLINQ, or ????

Please can anybody guide me? Especially with regards to the memory efficiency of any given approach. If not I'll have to "prototype" both solutions and profile them side-by-side. 

I'm a bit of a raw prawn in .NET. Any guidance would be greatly appreciated. 

Thanking you. Keith.

<hr>

Sample XML - upto 100,000 of them, of upto 234,600 coords per feature.

<pre><code>&lt;feature featId="27168306" fType="vegetation" fTypeId="1129" fClass="vegetation" gType="Polygon" ID="0" cLockNr="51598" metadataId="51599" mdFileId="NRM/TIS/VEGETATION/9543_22_v3" dataScale="25000"&gt;
 &lt;MultiGeometry&gt;
 &lt;geometryMember&gt;
 &lt;Polygon&gt;
 &lt;outerBoundaryIs&gt;
 &lt;LinearRing&gt;
 &lt;coordinates&gt;153.505004,-27.42196 153.505044,-27.422015 153.503992 .... 172 coordinates omitted to save space ... 153.505004,-27.42196&lt;/coordinates&gt;
 &lt;/LinearRing&gt;
 &lt;/outerBoundaryIs&gt;
 &lt;/Polygon&gt;
 &lt;/geometryMember&gt;
 &lt;/MultiGeometry&gt;
&lt;/feature&gt;
</code></pre>

What is the best way to parse (big) XML in C# Code?

服务器

我正在用C#编写一个地理信息系统客户端工具，以便从服务器检索基于GML schema (示例如下)中的“特性”。提取限制为100,000个特征。我估计最大的extract.xml可能会达到150MB左右，所以很明显DOM解析器已经过时了，我一直在尝试在和生成的绑定之间做出选择--或者-- 和一个手工制作的对象图。或者也...

问在C#代码中解析(大) XML的最佳方法是什么？
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