c# - ConfigurationErrorsException occured -

c# - ConfigurationErrorsException occured -

i want create custom configuration c# application. app.config likes:

<?xml version="1.0" encoding="utf-8" ?> <configuration> <configsections> <section name="location" type ="folderconfigsection.locationconfig, folderconfigsection"/> </configsections> <location> <folders> <add folder ="c:\test1"/> <add folder ="c:\test2" /> <add folder ="c:\test3" /> </folders> </location> <startup> <supportedruntime version="v4.0" sku=".netframework,version=v4.5" /> </startup> </configuration>

so created 2 classes.

namespace folderconfigsection { public class locationconfig : configurationsection { [configurationproperty("folders")] public string folder { { homecoming base["folder"] string; } set { base["folder"] = value; } } } }

and

namespace folderconfigsection { public class foldercollection : configurationelementcollection { protected override configurationelement createnewelement() { homecoming new folderelement(); } protected override object getelementkey(configurationelement element) { homecoming ((folderelement)element).environment; } } public class folderelement : configurationelement { [configurationproperty("folder", isrequired = true)] public string environment { { homecoming (string)this["folder"]; } set { this["folder"] = value; } } } }

but got exception in program.cs

public class programme { public static void main(string[] args) { locationconfig _locationconfig = (locationconfig)configurationmanager.getsection("location"); string firstfolder = _locationconfig.folder; } }

the exception the section name 'location' reserved <location> sections. want list folders.

anything wrong?

i'm restating @tim has answered in comments.

do not utilize location section name. reserved <location> element configuration. utilize other name, such locationconfig. change type of folder property in locationconfig class string foldercollection. clarity, should alter property name folder plural form folders. to list folders in locationconfig, need iterate folders collection property. might want implement indexer on foldercollection class, indexed access folders property, .

putting in code:

app.config <?xml version="1.0" encoding="utf-8" ?> <configuration> <configsections> <section name="locationconfig" type ="folderconfigsection.locationconfig, folderconfigsection"/> </configsections> <locationconfig> <folders> <add folder ="c:\test1"/> <add folder ="c:\test2" /> <add folder ="c:\test3" /> </folders> </locationconfig> <startup> <supportedruntime version="v4.0" sku=".netframework,version=v4.5" /> </startup> </configuration> locationconfig namespace folderconfigsection { using system.configuration; public class locationconfig : configurationsection { // alter property type foldercollection, , // alter property name `folders` clarity [configurationproperty("folders")] public foldercollection folders { { homecoming base["folders"] foldercollection; } // setter property isn't needed here // set { base["folders"] = value; } } } public class foldercollection : configurationelementcollection { protected override configurationelement createnewelement() { homecoming new folderelement(); } protected override object getelementkey(configurationelement element) { homecoming ((folderelement)element).environment; } // indexer public folderelement this[int index] { { homecoming baseget(index) folderelement; } } } public class folderelement : configurationelement { [configurationproperty("folder", isrequired = true)] public string environment { { homecoming (string)this["folder"]; } set { this["folder"] = value; } } } } program.cs public class programme { static void main(string[] args) { var locationconfig = (locationconfig)configurationmanager.getsection("locationconfig"); foreach (folderelement folder in locationconfig.folders) { // list folders console.writeline(folder.environment); } // first folder using indexer property console.writeline(locationconfig.folders[0].environment); } }

c# .net