Deserialize dictionary with datacontractserializer c#

Question

I want to deserialize a dictionary with datacontractserializer, the xml schema is the following :


<General xmlns="http://schemas.datacontract.org/2004/07/MyProject" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Mydictionary xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
    <a:KeyValueOfunsignedByteMyclass>
        <a:Key>1</a:Key>
        <a:Value>
                     ....
        </a:Value>
    </a:KeyValueOfunsignedByteMyclass>
    <a:KeyValueOfunsignedByteMyclass>
        <a:Key>2</a:Key>
        <a:Value>
                    ....
        </a:Value>
    </a:KeyValueOfunsignedByteMyclass>
</Mydictionary>

But on deserializing, I get this error :

"An item with the same key has already been added."

(referencing KeyValueOfunsignedByteMyclass)

Can someone help me to resolve this problem please?

Thanks

Vulpes · Answer

Apart from the separate first line (which looks invalid to me), I was able to reproduce that XML document and then deserialize it back using the following code: using System; using System.Collections.Generic; using System.Xml; using System.Runtime.Serialization; [DataContract(Namespace="")] public class MyClass { } [CollectionDataContract(ItemName="KeyValueOfunsignedByteMyclass", Namespace="http://schemas.microsoft.com/2003/10/Serialization/Arrays")] public class Mydictionary : Dictionary { } class Test { static void Main() { Mydictionary myDict = new Mydictionary(); myDict.Add(1, new MyClass()); myDict.Add(2, new MyClass()); XmlWriterSettings settings = new XmlWriterSettings(); settings.Indent = true; settings.OmitXmlDeclaration = true; string fileName = "MyDictionary.xml"; XmlWriter writer = XmlWriter.Create(fileName, settings); DataContractSerializer serializer = new DataContractSerializer(typeof(Mydictionary)); serializer.WriteStartObject(writer, myDict); writer.WriteAttributeString("xmlns", "a", null, "http://schemas.microsoft.com/2003/10/Serialization/Arrays"); serializer.WriteObjectContent(writer, myDict); serializer.WriteEndObject(writer); writer.Close(); XmlReader reader = XmlReader.Create(fileName); Mydictionary result = (Mydictionary)serializer.ReadObject(reader); reader.Close(); foreach(byte b in result.Keys) Console.WriteLine(b); Console.ReadKey(); } } The resulting XML is: 1 2 The console output (as expected) is: 1 2

Deserialize dictionary with datacontractserializer c#

Answers (1)