.net – “Type not expected”,使用DataContractSerializer –

using System;
using System.Runtime.Serialization;

namespace VDB_Sync.Model
{
[DataContract(Name="Konstant")]
public class Konstant : DataFelt
{
    [DataMember]
    private MySqlDbType mydataType;
    [DataMember]
    private object value;

    public Konstant(string navn,MySqlDbType dataType,object value)
        : base(navn,dataType,"*Konstant",false,false)
    {
        //this.navn = navn;
        this.mydataType = dataType;
        this.value = value;

        if (navn.Contains("*L?benummer"))
        {
            navn = "*Konstant: " + Convert.ToString(value);
        }
    }

    public object Value
    {
        get
        {
            return value;
        }
    }

}
}

它给我这个：

Type ‘VDB_Sync.Model.Konstant’ with data contract name ‘Konstant:http://schemas.datacontract.org/2004/07/VDB_Sync.Model’ is not expected. Consider using a DataContractResolver or add any types not known statically to the list of known types – for example,by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.

*我迄今为止找到的帮助指向集合和类型。我有一个枚举(MySqlDbType)在我的类 – 但得到这样：我甚至得到相同的错误时，我没有声明任何DataMembers：-x
那么 – 这里发生了什么？我缺少什么？

为了参考，这是我如何序列化它，VDB_SessionController是根：*

public void GemKonfig(VDB_SessionController session)
    {
        var settings = new XmlWriterSettings()
        {
            Indent = true,IndentChars = "t"
        };

        var writer = XmlWriter.Create(defaultFile,settings);
        DataContractSerializer ser =
            new DataContractSerializer(typeof(VDB_SessionController));

        ser.WriteObject(writer,session);
        writer.Close();
    }