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    <p>I dug a little deeper into this fascinating topic and have to say that working with what amounts to an associative array is just a pain in the .NET SOAP implementation. An associative array is represented as an IDictionary (e.g. Hashtable) – but refuses to be serialized (try it!).</p> <p>The below code is the closest I could get – and for some reason (bug?) it does not work on the .NET framework, but does work on Mono.</p> <pre><code>using System; using System.IO; using System.Xml; using System.Xml.Schema; using System.Xml.Serialization; using System.Collections.Generic; using System.Text; public class Test { /* * as per http://stackoverflow.com/a/1072815/2348103 */ public class Item { [XmlElement(Form = XmlSchemaForm.Unqualified)] public string key; [XmlElement(Form = XmlSchemaForm.Unqualified)] public string value; } [SoapType(TypeName = "Map", Namespace = "http://xml.apache.org/xml-soap")] public class Map : List&lt;Item&gt; { } public static void Main() { Map map = new Map(); map.Add( new Item { key="foo", value="bar" } ); map.Add( new Item { key="quux", value="barf" } ); XmlTypeMapping mapping = (new SoapReflectionImporter()).ImportTypeMapping( map.GetType() ); XmlSerializer serializer = new XmlSerializer( mapping ); XmlTextWriter writer = new XmlTextWriter( System.Console.Out ); writer.Formatting = Formatting.Indented; writer.WriteStartElement( "root" ); serializer.Serialize( writer, map ); writer.WriteEndElement(); writer.Close(); } } /* // // does not work - but see http://msdn.microsoft.com/en-us/magazine/cc164135.aspx // public class Map : IXmlSerializable { const string NS = "http://xml.apache.org/xml-soap"; public IDictionary dictionary; public Map() { dictionary = new Hashtable(); } public Map(IDictionary dictionary) { this.dictionary = dictionary; } public void WriteXml(XmlWriter w) { w.WriteStartElement("Map", NS); foreach (object key in dictionary.Keys) { object value = dictionary[key]; w.WriteStartElement("item", NS); w.WriteElementString("key", NS, key.ToString()); w.WriteElementString("value", NS, value.ToString()); w.WriteEndElement(); } w.WriteEndElement(); } public void ReadXml(XmlReader r) { r.Read(); // move past container r.ReadStartElement("dictionary"); while (r.NodeType != XmlNodeType.EndElement) { r.ReadStartElement("item", NS); string key = r.ReadElementString("key", NS); string value = r.ReadElementString("value", NS); r.ReadEndElement(); r.MoveToContent(); dictionary.Add(key, value); } } public System.Xml.Schema.XmlSchema GetSchema() { return null; } } */ </code></pre> <p><strong>Sample output from Mono:</strong></p> <pre><code>&lt;q1:Map xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" id="id1" d2p1:arrayType="Item[2]" xmlns:d2p1="http://schemas.xmlsoap.org/soap/encoding/" xmlns:q1="http://xml.apache.org/xml-soap"&gt; &lt;Item href="#id2" /&gt; &lt;Item href="#id3" /&gt; &lt;/q1:Map&gt; [...] </code></pre> <p><strong>Sample output from .NET:</strong></p> <pre><code>&lt;q1:Array xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" id="id1" q1:arrayType="Item[2]" xmlns:q1="http://schemas.xmlsoap.org/soap/encoding/"&gt; &lt;Item href="#id2" /&gt; &lt;Item href="#id3" /&gt; &lt;/q1:Array&gt; [...] </code></pre>
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    1. USStefan Paletta
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    1. COyour answer is the best one i have seen so far despite that it doesn't work on .net ... if one could just understand why.. i will give you the bounty for the effort you made. thank you.
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