how to have custom attribute in ConfigurationElementCollection?

Question

for configuration as following

  
  ... other entries
         


        

Answer 1

If you want to genericize it, this should help:

using System.Configuration;

namespace Abcd
{
  // Generic implementation of ConfigurationElementCollection.
  [ConfigurationCollection(typeof(ConfigurationElement))]
  public class ConfigurationElementCollection : ConfigurationElementCollection
                                         where T : ConfigurationElement, IConfigurationElement, new()
  {
    protected override ConfigurationElement CreateNewElement()
    {
      return new T();
    }

    protected override object GetElementKey(ConfigurationElement element)
    {
      return ((IConfigurationElement)element).GetElementKey();
    }

    public T this[int index]
    {
      get { return (T)BaseGet(index); }
    }

    public T GetElement(object key)
    {
      return (T)BaseGet(key);
    }
  }
}

Here's the interface referenced above:

namespace Abcd
{
  public interface IConfigurationElement
  {
    object GetElementKey();
  }
}