WCF XML Post Request Only Partially Loading Object

Question

I have a WCF Service with a "POST" method that takes in XML and turns it into an object, the problem is only some of the fields are being loaded.

Object Sample:

[DataMember, XmlElement(IsNullable = false, Type = typeof(String))]
    public String ClaimKey
    {
        get;
        set;
    }
    [DataMember, XmlElement(IsNullable = false, Type = typeof(String))]
    public String VehicleRegistrationNo
    {
        get;
        set;
    }

Input Sample

[WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Xml, RequestFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.Bare)]
    public SalvageInstructionResponse Test(SalvageInstructionRequestHeader Item)
    {
        this._objOutput = new SalvageInstructionResponse(SalvageInstructionResponseStatus.FAILURE, "Test", Item.ToString());
        return this._objOutput;
    }

XML Sample:

      <ClaimKey>str1234</ClaimKey>
  <VehicleRegistrationNo>str1234</VehicleRegistrationNo>

So using the above sample only "VehicleRegistrationNo" is loading but the ClaimKey is null.

The XML and the class are bigger but it's loading about 40% of the properties.

Answer 1

When transferring the object between the server end and the client, you should ensure that the DataContract is consistent. IExtensibleDataObject interface is a good choice for maintain the consistency. Both DataMember and IsRequired property have an impact on this issue.
https://learn.microsoft.com/en-us/dotnet/framework/wcf/feature-details/data-contract-versioning
In addition, Data contract Serializer is constrained of the MaxItemInObjectGraph property. Refer to the following code.

<behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpsGetEnabled="true" httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="true" />
          <dataContractSerializer maxItemsInObjectGraph="2147483647" />
        </behavior>
      </serviceBehaviors>

Feel free to contact me if there is anything I can help with.