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copied!<p>Create one of your own :-), the readonly feature is bonus but if you need a key other than a string then the class needs some modifications... </p> <pre><code>namespace MyNameSpace { [XmlRoot("SerializableDictionary")] public class SerializableDictionary : Dictionary<String, Object>, IXmlSerializable { internal Boolean _ReadOnly = false; public Boolean ReadOnly { get { return this._ReadOnly; } set { this.CheckReadOnly(); this._ReadOnly = value; } } public new Object this[String key] { get { Object value; return this.TryGetValue(key, out value) ? value : null; } set { this.CheckReadOnly(); if(value != null) { base[key] = value; } else { this.Remove(key); } } } internal void CheckReadOnly() { if(this._ReadOnly) { throw new Exception("Collection is read only"); } } public new void Clear() { this.CheckReadOnly(); base.Clear(); } public new void Add(String key, Object value) { this.CheckReadOnly(); base.Add(key, value); } public new void Remove(String key) { this.CheckReadOnly(); base.Remove(key); } public XmlSchema GetSchema() { return null; } public void ReadXml(XmlReader reader) { Boolean wasEmpty = reader.IsEmptyElement; reader.Read(); if(wasEmpty) { return; } while(reader.NodeType != XmlNodeType.EndElement) { if(reader.Name == "Item") { String key = reader.GetAttribute("Key"); Type type = Type.GetType(reader.GetAttribute("TypeName")); reader.Read(); if(type != null) { this.Add(key, new XmlSerializer(type).Deserialize(reader)); } else { reader.Skip(); } reader.ReadEndElement(); reader.MoveToContent(); } else { reader.ReadToFollowing("Item"); } reader.ReadEndElement(); } public void WriteXml(XmlWriter writer) { foreach(KeyValuePair<String, Object> item in this) { writer.WriteStartElement("Item"); writer.WriteAttributeString("Key", item.Key); writer.WriteAttributeString("TypeName", item.Value.GetType().AssemblyQualifiedName); new XmlSerializer(item.Value.GetType()).Serialize(writer, item.Value); writer.WriteEndElement(); } } } } </code></pre>

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