[英]C# replace XML node with a new attribute and subnode
我有這個 xml 文件:
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
<section name="MyApp.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</sectionGroup>
</configSections>
<startup><supportedRuntime version="v2.0.50727"/></startup>
<applicationSettings>
<MyApp.Settings>
...
...
</XNet.XManager.Properties.Settings>
</applicationSettings>
我需要將<startup>
節點替換為:
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
哪種方法最好?
如果您使用 LINQ to XML(它是一個 XML API 而不是 LINQ):
XDocument doc = XDocument.Load("dat.xml");
XElement startup1 = doc.Root.Element("startup");
startup1.Remove();
doc.Root.Add(new XElement("startup", new XAttribute("useLegacyV2RuntimeActivationPolicy", "true"),
new XElement("supportedRuntime", new XAttribute("version", "v4.0"),
new XAttribute("sku", ".NETFramework"),
new XAttribute("Version", "v4.5.2"))));
doc.Save("dat.xml");
編輯 - 正如 Jon Skeet 建議的正確方法應該是使用XElement.ReplaceWith
:
XDocument doc = XDocument.Load("dat.xml");
XElement startup1 = doc.Root.Element("startup");
startup1.ReplaceWith(new XElement("startup", new XAttribute("useLegacyV2RuntimeActivationPolicy", "true"),
new XElement("supportedRuntime", new XAttribute("version", "v4.0"),
new XAttribute("sku", ".NETFramework"),
new XAttribute("Version", "v4.5.2"))));
doc.Save("dat.xml");
您可以使用以下代碼執行相同操作,其中正在查找元素並將其替換為其他。
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("path to your file");
string strXml =
@"<startup useLegacyV2RuntimeActivationPolicy='true'>
<supportedRuntime version='v4.0' sku='.NETFramework,Version=v4.5.2' />
</startup>";
XmlDocumentFragment xmlDocFragment = xmlDoc.CreateDocumentFragment();
xmlDocFragment.InnerXml = strXml;
xmlDoc.SelectSingleNode("startup").AppendChild(xmlDocFragment);
更新:使用LINQ
。 工作測試代碼
var doc = XDocument.Load(@"path to file");
string input = @"<startup useLegacyV2RuntimeActivationPolicy='true'>
<supportedRuntime version='v4.0' sku='.NETFramework,Version=v4.5.2' />
</startup>";
var replacement = XElement.Parse(input);
var nodeToReplace = doc.Descendants().Elements("startup").FirstOrDefault();
nodeToReplace.ReplaceWith(replacement);
doc.Save(@"path to file");
Console.WriteLine(doc);
Console.Read();
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