c# - Unrecognized attribute custom configuration (again) -

i'm creating custom configuration section keep getting attribute not recognized error when trying section.

i'm pretty sure it's dumb typo - here can spot it.

code:

<configsections>   <section name="clientfiltersettings" type="espdb.config.clientfiltersettings, espdb"/> </configsections> <clientfiltersettings>   <allowedips>     <ipaddress ip="255.255.255.255"/>   </allowedips> </clientfiltersettings> 

section:

namespace espdb.config {     public class clientfiltersettings : configurationsection     {         private static clientfiltersettings _settings =              configurationmanager.getsection(typeof(clientfiltersettings).name) clientfiltersettings             /*?? new clientfiltersettings()*/;          private const string _allowedips = "allowedips";          public static clientfiltersettings settings         {             { return _settings; }         }          [configurationproperty(_allowedips, isrequired = true)]         [configurationcollection(typeof(ipaddresscollection))]         public ipaddresscollection allowedips         {             { return (ipaddresscollection)this[_allowedips]; }             set { this[_allowedips] = value; }         }     } } 

collection:

namespace espdb.config {     public class ipaddresscollection : configurationelementcollection     {         protected override configurationelement createnewelement()         {             return new ipaddresscollection();         }          protected override object getelementkey(configurationelement element)         {             return (element ipaddresselement).ip;         }          protected override string elementname         {             { return "ipaddress"; }         }          public ipaddresselement this[int index]         {                         {                 return base.baseget(index) ipaddresselement;             }             set             {                 if (base.baseget(index) != null)                 {                     base.baseremoveat(index);                 }                 this.baseadd(index, value);             }         }          public new ipaddresselement this[string responsestring]         {             { return (ipaddresselement)baseget(responsestring); }             set             {                 if (baseget(responsestring) != null)                 {                     baseremoveat(baseindexof(baseget(responsestring)));                 }                 baseadd(value);             }         }     } } 

element

namespace espdb.config {     public class ipaddresselement : configurationelement     {         private const string _ip = "ip";          [configurationproperty(_ip, iskey = true, isrequired = true)]         public string ip         {             { return this[_ip] string; }             set { this[_ip] = value; }         }     } } 

there multiple problems in code.

1). recursively creating objects of clientfiltersettings. remove following code, not required.

private static clientfiltersettings _settings =                  configurationmanager.getsection(typeof(clientfiltersettings).name) clientfiltersettings         /*?? new clientfiltersettings()*/;  public static clientfiltersettings settings      {              { return _settings; }      } 

2). change attribute from

[configurationcollection(typeof(ipaddresscollection))] 

to

[configurationcollection(typeof(ipaddresselement), additemname = "ipaddress", collectiontype = configurationelementcollectiontype.basicmap)] 

3). creating collection object within collection. modify code below

return new ipaddresscollection(); 

with

return new ipaddresselement();