Insert into NameValueCollection in .NET

Question

Is it possible to insert an item into a NameValueCollection in a specific index? I don't see an Insert() method.

Answer 1

Here's an implementation of an Insert extension method for NameValueCollection:

static class ColExtensions
{
    private class KeyValuesPair
    {
        public string Name { get; set; }
        public string[] Values { get; set; }
    }

    public static void Insert(this NameValueCollection col, int index, string name, string value)
    {
        if (index < 0 || index > col.Count)
            throw new ArgumentOutOfRangeException();

        if (col.GetKey(index) == value)
        {
            col.Add(name, value);
        }
        else
        {
            List<KeyValuesPair> items = new List<KeyValuesPair>();
            int size = col.Count;
            for (int i = index; i < size; i++)
            {
                string key = col.GetKey(index);
                items.Add(new KeyValuesPair
                {
                    Name = key,
                    Values = col.GetValues(index),
                });
                col.Remove(key);
            }

            col.Add(name, value);

            foreach (var item in items)
            {
                foreach (var v in item.Values)
                {
                    col.Add(item.Name, v);
                }
            }
        }
    }
}