Serializing JSON object error of Generic type

Question

I am trying to serialize an object that I have created here:

using (MemoryStream memStream = new MemoryStream())
{
    DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(CaseTreatment));
    ser.WriteObject(memStream, ct);
}

This is ct here: List<CaseTreatment> ct = new List<CaseTreatment>();

Whenever my code hits ser.WriteObject(memStream, ct); I get the following error:

Type 'System.Collections.Generic.List`1[[FileUpload.Models.CaseTreatment, FileUpload,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' with data contract name 
'ArrayOfCaseTreatment:http://schemas.datacontract.org/2004/07/FileUpload.Models' 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.

My CaseTreatment object looks like this:

[DataContract]
public class CaseTreatment
{
    [DataMember]
    public Bridge BridgeTreatment;
}

And Bridge looks like this:

[DataContract]
public class Bridge : CaseGeneric
{
    [DataMember]
    public bool IsBridgeTreatment;

    public Bridge(XElement treatment, IEnumerable<XElement> orderDetails)
    {
        var tn = Util.GetTitle(treatment);
        this.Instruction = Util.GetInstruction(tn);
        this.Id = 2;
        this.Name= "Bridge";
        this.Something = Util.GetSomething(tn);
    }

    public Bridge()
    {

    }

}

Something is another object:

[DataContract]
public class Something
{
    [DataMember]
    public string Number;
}

And CaseGeneric has all of this:

[DataContract]
public class CaseGeneric
{
    [DataMember]
    public string Instruction;
    [DataMember]
    public int Id;
    [DataMember]
    public string Name;
    [DataMember]
    public List<Something> Something;
}

Would anyone be able to help? Also please let me know if you need more information, I will be more than happy to add/edit anything or answer any questions. I thought that I might need to decorate my objects with [KnownType(typeof(blah))] I just dont know where and of which one.

scapegoat17 · Accepted Answer · 2015-01-06 19:15:52Z

1

You are trying to write a object in a list. Try changing DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(CaseTreatment)); to DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(List<CaseTreatment>));

edited Jan 6, 2015 at 19:15

scapegoat17

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answered Jan 6, 2015 at 19:05

Greens

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