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DTD objects in configuration file

I am trying to use entity definitions in a configuration file to simplify the differences between development versions, QA, UAT, and production. Here is an example of the start of my configuration file:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE configuration [
    <!ENTITY MyStorageLocation "\\MyServer\MyStorageFolder">
    <!ENTITY MyDatabaseServer "devdb01">
]>
<configuration>
    <configSections>
    <section name="MyCustomSection" type="MyCustomSectionHandler,MyAssembly"/>
        ...
    </configSections>
<connectionStrings>
    <add name="MyConnectionString" providerName="System.Data.SqlClient" connectionString="Server=&MyDatabaseServer;;Database=MyDatabase;"/>
</connectionStrings>
    ...
<MyCustomSection>&MyStorageLocation;</MyCustomSection>
</configuration>

This seems to be fine, and why not the way it is perfectly valid XML if I don't use any of these entities in a custom configuration section, in which I end up calling ConfigurationManager.GetSection (). Using the "MyDatabaseServer" object in the connection string does not cause any problems. In the above example, everything will work fine until I use the MyStorageLocation object in the MyCustomSection element, and then I encountered an error when calling ConfigurationManager.GetSection () with a request for a custom section.

, ConfigurationManager XML, XML . , ?

:

2009-01-27 14:00:53,474 [11936] ERROR MyCustomWindowsService [(null)] - Errors starting service -- shutting down
System.Configuration.ConfigurationErrorsException: Reference to undeclared entity 'MyStorageLocation'. Line 183, position 19. (D:\...\MyCustomWindowsService.exe.config line 183) ---> System.Xml.XmlException: Reference to undeclared entity 'MyStorageLocation'. Line 183, position 19.
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.HandleGeneralEntityReference(String name, Boolean isInAttributeValue, Boolean pushFakeEntityIfNullResolver, Int32 entityStartLinePos)
   at System.Xml.XmlTextReaderImpl.ResolveEntity()
   at System.Xml.XmlTextReader.ResolveEntity()
   at System.Xml.XmlLoader.LoadEntityReferenceNode(Boolean direct)
   at System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace)
   at System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc)
   at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
   at System.Xml.XmlDocument.Load(XmlReader reader)
   at System.Configuration.ErrorInfoXmlDocument.LoadFromConfigXmlReader(ConfigXmlReader reader)
   at System.Configuration.RuntimeConfigurationRecord.RuntimeConfigurationFactory.CreateSectionImpl(RuntimeConfigurationRecord configRecord, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader)
   at System.Configuration.RuntimeConfigurationRecord.RuntimeConfigurationFactory.CreateSectionWithRestrictedPermissions(RuntimeConfigurationRecord configRecord, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader)
   at System.Configuration.RuntimeConfigurationRecord.CreateSection(Boolean inputIsTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader)
   at System.Configuration.BaseConfigurationRecord.CallCreateSection(Boolean inputIsTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentConfig, ConfigXmlReader reader, String filename, Int32 line)
   --- End of inner exception stack trace ---
   at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)
   at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)
   at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
   at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
   at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
   at System.Configuration.BaseConfigurationRecord.GetSection(String configKey, Boolean getLkg, Boolean checkPermission)
   at System.Configuration.BaseConfigurationRecord.GetSection(String configKey)
   at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String sectionName)
   at System.Configuration.ConfigurationManager.GetSection(String sectionName)
   at MyCustomWindowsService.Monitor() in D:\...\MyCustomWindowsService.cs:line 207
   at MyCustomWindowsService.Start() in D:\...\MyCustomWindowsService.cs:line 178

ConfigurationManager...

+3
1

, XML- ! ENTITY, DTD.

DTD, ? DTD , , . - XML, ​​ URL-: http://www.validome.org/xml/validate/

DTD I. , .

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE configuration [
    <!ELEMENT configuration (configSections+, connectionStrings+, MyCustomSection)>

    <!ELEMENT configSections (section+)>

    <!ELEMENT section EMPTY>
    <!ATTLIST section name CDATA #REQUIRED>
    <!ATTLIST section type CDATA #REQUIRED>

    <!ELEMENT connectionStrings (add+)>

    <!ELEMENT add EMPTY>
    <!ATTLIST add name CDATA #REQUIRED>
    <!ATTLIST add providerName CDATA #REQUIRED>
    <!ATTLIST add connectionString CDATA #REQUIRED>

    <!ELEMENT MyCustomSection (#PCDATA)>

    <!ENTITY MyStorageLocation "\\MyServer\MyStorageFolder">
    <!ENTITY MyDatabaseServer "devdb01">
]>
<configuration>
  <configSections>
    <section name="MyCustomSection" type="MyCustomSectionHandler,MyAssembly"/>
  </configSections>
  <connectionStrings>
    <add name="MyConnectionString" providerName="System.Data.SqlClient" connectionString="Server=&MyDatabaseServer;;Database=MyDatabase;"/>
  </connectionStrings>
  <MyCustomSection>&MyStorageLocation;</MyCustomSection>
</configuration>
0

Source: https://habr.com/ru/post/1702321/

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