C:/Private/OSS/n2cms/github/n2cms/src/Framework/N2/Configuration/FileSystemFolderCollection.cs

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using System.Collections.Generic;
using System.Configuration;

namespace N2.Configuration
{
        [ConfigurationCollection(typeof(FolderElement))]
        public class FileSystemFolderCollection : ConfigurationElementCollection
    {
        public FileSystemFolderCollection()
        {
            FolderElement folder = new FolderElement();
            folder.Path = "~/upload/";
            base.BaseAdd(folder);
        }

        protected override ConfigurationElement CreateNewElement()
        {
            return new FolderElement();
        }

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

                public void Add(string folderPath)
                {
                        BaseAdd(new FolderElement { Path = folderPath });
                }

        public FolderElement this[int index]
        {
            get { return (FolderElement)base.BaseGet(index); }
        }

        public IEnumerable<string> Folders
        {
                get
                {
                        foreach(FolderElement element in this)
                        {
                                        if (element.Path.EndsWith("/"))
                                                yield return element.Path;
                                        else
                                                yield return element.Path + "/";
                        }
                }
        }
    }
}