SharePoint CAML Query Builder Dialog for your Web Parts

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;

namespace Mullivan.Collections.Generic
{
    /// <summary>
    /// A serializable dictionary class.
    /// </summary>
    /// <typeparam name="TKey">The dictionary key object.</typeparam>
    /// <typeparam name="TValue">The dictionary value object.</typeparam>
    [XmlRoot("dictionary")]
    public class SerializableDictionary<TKey, TValue>

        : Dictionary<TKey, TValue>, IXmlSerializable
    {
        /// <summary>
        /// Initializes a new instance of the <c>SerializableDictionary</c> class.
        /// </summary>
        public SerializableDictionary()
            : base()
        { }

        /// <summary>
        /// Gets or sets a value from the <c>SerializableDictionary</c> class based on a key.
        /// </summary>
        /// <param name="key">The key object used to retrieve the value from the dictionary.</param>
        /// <returns>A value object based on the given key.</returns>
        public new TValue this[TKey key]
        {
            get
            {
                if (ContainsKey(key))
                    return base[key];
                else
                    return default(TValue);
            }
            set
            {
                if (ContainsKey(key))
                    base[key] = value;
                else
                    this.Add(key, value);
            }
        }

        #region IXmlSerializable Members

        /// <summary>
        /// Gets the <c>XmlSchema</c> of the class.
        /// </summary>
        /// <returns>The <c>XmlSchema</c> of the class.</returns>
        public System.Xml.Schema.XmlSchema GetSchema()
        {
            return null;
        }

        /// <summary>
        /// Deserializes a <c>SerializableDictionary</c> object from a given <c>XmlReader</c> object
        /// and stores the data in the current instantiated <c>SerializableDictionary</c> object.
        /// </summary>
        /// <param name="reader">
        /// The <c>XmlReader</c> object that provides the xml information to be deserialized.
        /// </param>
        public void ReadXml(System.Xml.XmlReader reader)
        {
            XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
            XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
            bool wasEmpty = reader.IsEmptyElement;
            reader.Read();
            if (wasEmpty)
                return;

            reader.MoveToContent();

            while (reader.Name == "item" && reader.NodeType == System.Xml.XmlNodeType.Element)
            {
                reader.ReadStartElement("item");
                reader.ReadStartElement("key");
                TKey key = (TKey)keySerializer.Deserialize(reader);
                reader.ReadEndElement();
                reader.ReadStartElement("value");
                TValue value = (TValue)valueSerializer.Deserialize(reader);
                this.Add(key, value);
                reader.ReadEndElement();
                reader.ReadEndElement();
                reader.MoveToContent();
            }

            reader.ReadEndElement();

        }


        /// <summary>
        /// Serializes the current <c>SerializableDictionary</c> object into an xml file
        /// using the given <c>XmlWriter</c>.
        /// </summary>
        /// <param name="writer">
        /// The <c>XmlWriter</c> object used for serialization of the
        /// <c>SerializableDictionary</c> object.
        /// </param>
        public void WriteXml(System.Xml.XmlWriter writer)
        {
            XmlSerializer keySerializer = new XmlSerializer(typeof(TKey));
            XmlSerializer valueSerializer = new XmlSerializer(typeof(TValue));
            foreach (TKey key in this.Keys)
            {
                writer.WriteStartElement("item");
                writer.WriteStartElement("key");
                keySerializer.Serialize(writer, key);
                writer.WriteEndElement();
                writer.WriteStartElement("value");
                TValue value = this[key];
                valueSerializer.Serialize(writer, value);
                writer.WriteEndElement();
                writer.WriteEndElement();
            }

        }

        #endregion

    }

}