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    <p>In your definition of <code>FileInfoCollection</code> in the method <code>CreateNewElement</code> you create <code>FileInfoCollection</code> which is wrong. Overridden <code>CreateNewElement</code> should return new collection element, not the new collection:</p> <pre><code>public class FileInfoCollection : ConfigurationElementCollection { protected override ConfigurationElement CreateNewElement() { return new FileInfoElement(); } protected override object GetElementKey (ConfigurationElement element) { return ((FileInfoElement)element).Extension; } } </code></pre> <p>Regarding your desired configuration, probably the simplest implementation will look like:</p> <pre><code>public class AuthorisedClientsSection : ConfigurationSection { [ConfigurationProperty("", IsDefaultCollection = true)] public AuthorisedClientElementCollection Elements { get { return (AuthorisedClientElementCollection)base[""];} } } public class AuthorisedClientElementCollection : ConfigurationElementCollection { const string ELEMENT_NAME = "AuthorisedClient"; public override ConfigurationElementCollectionType CollectionType { get { return ConfigurationElementCollectionType.BasicMap; } } protected override string ElementName { get { return ELEMENT_NAME; } } protected override ConfigurationElement CreateNewElement() { return new AuthorisedClientElement(); } protected override object GetElementKey(ConfigurationElement element) { return ((AuthorisedClientElement)element).Name; } } public class AuthorisedClientElement : ConfigurationElement { const string NAME = "name"; [ConfigurationProperty(NAME, IsRequired = true)] public string Name { get { return (string)base[NAME]; } } [ConfigurationProperty("", IsDefaultCollection = true)] public QueueElementCollection Elements { get { return (QueueElementCollection)base[""]; } } } public class QueueElementCollection : ConfigurationElementCollection { const string ELEMENT_NAME = "Queue"; public override ConfigurationElementCollectionType CollectionType { get { return ConfigurationElementCollectionType.BasicMap; } } protected override string ElementName { get { return ELEMENT_NAME; } } protected override ConfigurationElement CreateNewElement() { return new QueueElement(); } protected override object GetElementKey(ConfigurationElement element) { return ((QueueElement)element).Id; } } public class QueueElement : ConfigurationElement { const string ID = "id"; [ConfigurationProperty(ID, IsRequired = true)] public int Id { get { return (int)base[ID]; } } } </code></pre> <p>And the test:</p> <pre><code>var authorisedClientsSection = ConfigurationManager.GetSection("AuthorisedClients") as AuthorisedClientsSection; foreach (AuthorisedClientElement client in authorisedClientsSection.Elements) { Console.WriteLine("Client: {0}", client.Name); foreach (QueueElement queue in client.Elements) { Console.WriteLine("\tQueue: {0}", queue.Id); } } </code></pre>
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    1. POCustom config section containing collection
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    1. USBazurbat
    1. USBazurbat
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    1. This table or related slice is empty.
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    1. VO
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      1. This table or related slice is empty.
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    2. VO
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    3. VO
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    1. COWow, that is my exact issue as well. Thanks!
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      1. USDave Nichol
    2. COThis was my issue too. Thank you very much. Catch an upvoite :-).
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