如何访问XML的特定节点，即serverurl，并更新C＃中的innertext？ [英] How can I access the specific node i.e serverurl of the XML and update the innertext in C#?

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本文介绍了如何访问XML的特定节点，即serverurl，并更新C＃中的innertext？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

<pre><?xml version="1.0" encoding="utf-8"?>
<ApplicationConfiguration

  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xmlns:ua="http://opcfoundation.org/UA/2008/02/Types.xsd"

  xmlns="http://opcfoundation.org/UA/SDK/Configuration.xsd"

>
  <ApplicationName>UA COM Server Wrapper</ApplicationName>
  <ApplicationUri>urn:localhost:UA:ComServerWrapper</ApplicationUri>
  <ProductUri>http://opcfoundation.org/UA/ComServerWrapper</ProductUri>
  <ApplicationType>Server_0</ApplicationType>

  <SecurityConfiguration>

    <!-- Where the application instance certificate is stored (MachineDefault) -->
    <ApplicationCertificate>
      <StoreType>Directory</StoreType>
      <StorePath>%CommonApplicationData%\OPC Foundation\CertificateStores\MachineDefault</StorePath>
      <SubjectName>CN=UA COM Server Wrapper, C=US, S=Arizona, O=OPC Foundation, DC=localhost</SubjectName>
    </ApplicationCertificate>

    <!-- Where the issuer certificate are stored (certificate authorities) -->
    <TrustedIssuerCertificates>
      <StoreType>Directory</StoreType>
      <StorePath>%CommonApplicationData%\OPC Foundation\CertificateStores\UA Certificate Authorities</StorePath>
    </TrustedIssuerCertificates>

    <!-- Where the trust list is stored (UA Applications) -->
    <TrustedPeerCertificates>
      <StoreType>Directory</StoreType>
      <StorePath>%CommonApplicationData%\OPC Foundation\CertificateStores\UA Applications</StorePath>
    </TrustedPeerCertificates>

    <!-- The directory used to store invalid certficates for later review by the administrator. -->
    <RejectedCertificateStore>
      <StoreType>Directory</StoreType>
      <StorePath>%CommonApplicationData%\OPC Foundation\CertificateStores\RejectedCertificates</StorePath>
    </RejectedCertificateStore>

    <!-- WARNING: The following setting (to automatically accept untrusted certificates) should be used
    for easy debugging purposes ONLY and turned off for production deployments! -->
    <AutoAcceptUntrustedCertificates>false</AutoAcceptUntrustedCertificates>
  
  </SecurityConfiguration>
  
  <TransportConfigurations />
  <TransportQuotas>
    <OperationTimeout>600000</OperationTimeout>
    <MaxStringLength>1048576</MaxStringLength>
    <MaxByteStringLength>4194304</MaxByteStringLength>
    <MaxArrayLength>65535</MaxArrayLength>
    <MaxMessageSize>4194304</MaxMessageSize>
    <MaxBufferSize>65535</MaxBufferSize>
    <ChannelLifetime>300000</ChannelLifetime>
    <SecurityTokenLifetime>3600000</SecurityTokenLifetime>
  </TransportQuotas>
  <ServerConfiguration>
    <BaseAddresses>
      <ua:String>opc.tcp://localhost:48400/UA/ComServerWrapper</ua:String>
      <!-- <ua:String>http://localhost:48401/UA/ComServerWrapper</ua:String> -->
    </BaseAddresses>
    <SecurityPolicies>
      <ServerSecurityPolicy>
        <SecurityMode>SignAndEncrypt_3</SecurityMode>
        <SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15</SecurityPolicyUri>
      </ServerSecurityPolicy>
      <ServerSecurityPolicy>
        <SecurityMode>Sign_2</SecurityMode>
        <SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic256</SecurityPolicyUri>
      </ServerSecurityPolicy>
      <ServerSecurityPolicy>
        <SecurityMode>None_1</SecurityMode>
        <SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#None</SecurityPolicyUri>
      </ServerSecurityPolicy>
      <ServerSecurityPolicy>
        <SecurityMode>Sign_2</SecurityMode>
        <SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15</SecurityPolicyUri>
      </ServerSecurityPolicy>
      <ServerSecurityPolicy>
        <SecurityMode>SignAndEncrypt_3</SecurityMode>
        <SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic256</SecurityPolicyUri>
      </ServerSecurityPolicy>
      <ServerSecurityPolicy>
        <SecurityMode>Sign_2</SecurityMode>
        <SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256</SecurityPolicyUri>
      </ServerSecurityPolicy>
      <ServerSecurityPolicy>
        <SecurityMode>SignAndEncrypt_3</SecurityMode>
        <SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256</SecurityPolicyUri>
      </ServerSecurityPolicy>
    </SecurityPolicies>
    <MinRequestThreadCount>5</MinRequestThreadCount>
    <MaxRequestThreadCount>100</MaxRequestThreadCount>
    <MaxQueuedRequestCount>2000</MaxQueuedRequestCount>
    
    <!-- The SDK expects the server to support the same set of user tokens for every endpoint. -->
    <UserTokenPolicies>
      <!-- Allows anonymous users -->
      <ua:UserTokenPolicy>
        <ua:TokenType>Anonymous_0</ua:TokenType>
        <ua:SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#None</ua:SecurityPolicyUri>
      </ua:UserTokenPolicy>

      <!-- Allows username/password -->
      <ua:UserTokenPolicy>
        <ua:TokenType>UserName_1</ua:TokenType>
        <!-- passwords must be encrypted - this specifies what algorithm to use -->
        <ua:SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic256</ua:SecurityPolicyUri>
      </ua:UserTokenPolicy>

      <!-- Allows user certificates -->
      <ua:UserTokenPolicy>
        <ua:TokenType>Certificate_2</ua:TokenType>
        <!-- certificate possession must be proven with a digital signature - this specifies what algorithm to use -->
        <ua:SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#Basic256</ua:SecurityPolicyUri>
      </ua:UserTokenPolicy>
     </UserTokenPolicies>
    
    <DiagnosticsEnabled>true</DiagnosticsEnabled>
    <MaxSessionCount>100</MaxSessionCount>
    <MinSessionTimeout>10000</MinSessionTimeout>
    <MaxSessionTimeout>3600000</MaxSessionTimeout>
    <MaxBrowseContinuationPoints>10</MaxBrowseContinuationPoints>
    <MaxQueryContinuationPoints>10</MaxQueryContinuationPoints>
    <MaxHistoryContinuationPoints>100</MaxHistoryContinuationPoints>
    <MaxRequestAge>600000</MaxRequestAge>
    <MinPublishingInterval>100</MinPublishingInterval>
    <MaxPublishingInterval>3600000</MaxPublishingInterval>
    <PublishingResolution>50</PublishingResolution>
    <MaxSubscriptionLifetime>3600000</MaxSubscriptionLifetime>
    <MaxMessageQueueSize>100</MaxMessageQueueSize>
    <MaxNotificationQueueSize>100</MaxNotificationQueueSize>
    <MaxNotificationsPerPublish>1000</MaxNotificationsPerPublish>
    <MinMetadataSamplingInterval>1000</MinMetadataSamplingInterval>
    <AvailableSamplingRates />
    
    <RegistrationEndpoint>
      <ua:EndpointUrl>opc.tcp://localhost:4840</ua:EndpointUrl>
      <ua:Server>
        <ua:ApplicationUri>opc.tcp://localhost:4840</ua:ApplicationUri>
        <ua:ApplicationType>DiscoveryServer_3</ua:ApplicationType>
        <ua:DiscoveryUrls>
          <ua:String>opc.tcp://localhost:4840</ua:String>
        </ua:DiscoveryUrls>
      </ua:Server>
      <ua:SecurityMode>SignAndEncrypt_3</ua:SecurityMode>
      <ua:SecurityPolicyUri />
      <ua:UserIdentityTokens />
    </RegistrationEndpoint>
    
    <MaxRegistrationInterval>30000</MaxRegistrationInterval>
    <NodeManagerSaveFile>Opc.Ua.Server.nodes.xml</NodeManagerSaveFile>
    <MinSubscriptionLifetime>10000</MinSubscriptionLifetime>
    <MaxPublishRequestCount>20</MaxPublishRequestCount>
    <MaxSubscriptionCount>100</MaxSubscriptionCount>
    <MaxEventQueueSize>10000</MaxEventQueueSize>
  </ServerConfiguration>

  <Extensions>
    <ua:XmlElement>
      <ComWrapperServerConfiguration xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://opcfoundation.org/UA/SDK/COMInterop">
        <WrappedServers>
          <ComClientConfiguration i:type="ComDaClientConfiguration">
            <ServerUrl>opc.com://localhost/Softing.OPCToolboxDemo_ServerDA.1</ServerUrl>
            <ServerName>DA</ServerName>
            <MaxReconnectWait>10000</MaxReconnectWait>
            <SeperatorChars></SeperatorChars>
            <AvailableLocales>
              <ua:String>en-US</ua:String>
              <ua:String>de-DE</ua:String>
              <ua:String>ja-JP</ua:String>
            </AvailableLocales>
            <BrowseToNotSupported>false</BrowseToNotSupported>
          </ComClientConfiguration>
          <ComClientConfiguration i:type="ComAeClientConfiguration">
            <ServerUrl>opc.com://localhost/Softing.OPCToolboxDemo_ServerAE.1/{2E565243-B238-11D3-842D-0008C779D775}</ServerUrl>
            <ServerName>AE</ServerName>
            <MaxReconnectWait>10000000</MaxReconnectWait>
            <SeperatorChars>\</SeperatorChars>
            <AvailableLocales>
              <ua:String>en-US</ua:String>
              <ua:String>de-DE</ua:String>
              <ua:String>ja-JP</ua:String>
            </AvailableLocales>
          </ComClientConfiguration>
          <!--
          <ComClientConfiguration i:type="ComHdaClientConfiguration">
            <ServerUrl>opc.com://localhost/OPCSample.OpcHdaServer/{6a5eedec-1509-4627-997f-993ccb65ab7c}</ServerUrl>
            <ServerName>HDA</ServerName>
            <MaxReconnectWait>10000</MaxReconnectWait>
            <SeperatorChars></SeperatorChars>
            <AddCapabilitiesToServerObject>true</AddCapabilitiesToServerObject>
            <AttributeSamplingInterval>1000</AttributeSamplingInterval>
            <TreatUncertainAsBad>true</TreatUncertainAsBad>
            <PercentDataBad>0</PercentDataBad>
            <PercentDataGood>100</PercentDataGood>
            <SteppedSlopedExtrapolation>false</SteppedSlopedExtrapolation>
          </ComClientConfiguration>
          -->
        </WrappedServers>
      </ComWrapperServerConfiguration>
    </ua:XmlElement>
  </Extensions>

  <TraceConfiguration>
    <OutputFilePath>%CommonApplicationData%\OPC Foundation\Logs\Opc.Ua.ComServerWrapper.log.txt</OutputFilePath>
    <DeleteOnLoad>true</DeleteOnLoad>
    <!-- Show Only Errors -->
    <!-- <TraceMasks>1</TraceMasks> -->
    <!-- Show Only Security and Errors -->
    <!-- <TraceMasks>513</TraceMasks> -->
    <!-- Show Only Security, Errors and Trace -->
    <TraceMasks>515</TraceMasks>
    <!-- Show Only Security, COM Calls, Errors and Trace -->
    <!-- <TraceMasks>1023</TraceMasks> -->
    <!-- Show Only Security, Service Calls, Errors and Trace -->
    <!-- <TraceMasks>523</TraceMasks> -->
    <!-- Show Only Security, ServiceResultExceptions, Errors and Trace -->
    <!-- <TraceMasks>519</TraceMasks> -->
  </TraceConfiguration>

</ApplicationConfiguration>





What I have tried:





What I have tried:

I can access this xml from c# What i want to do is to access specific node of the xml and update the innertext of this node with the text which i enter from textbox which i have created. Nodename : <ServerUrl> 

Please help me.

推荐答案

// Using XML api.
using System.Xml.Linq;

// Load XML document.
var document = XDocument.Load(...); // Path to file or content.

// Find required elements.
var allServerUrl = document.Descendants("ServerUrl");

// Change element content.
allServerUrl.First().Value = "http://contoso.com";

// Save document.
document.Save(...) // Path to file.


这篇关于如何访问XML的特定节点，即serverurl，并更新C＃中的innertext？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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