Unable to sending complex object through WCF - wcf

Question

I have a ServiceContract as such :
bool CreateSlideshow(Slideshow current, string path, string name);
When I run my program calling the service, I get the following exception :
There was an error while trying to serialize parameter
http://tempura.org/:current. The InnerException message was 'Type
'System.DelegateSerializationHolder+DelegateEntry' with data contract
name
'DelegateSerializationHolder.DelegateEntry:http://schemas.datacontract.org/2004/07/System'
is not expected. Consider using a DataContractResolver or add any
types not known statically to the list of known types.....
Apparently the problem lies in Slideshow. My class Slideshow has the following members :
private String name;
private String path;
private List<Slide> slides;
and the class Slide has the following members :
private String title;
private ContentTypeEnum contentType;
private String textContent;
private String pictureContextPath;
where ContentTypeEnum is an enumeration.
Any idea how to resolve the exception? Hope for some advice/suggestions. Thanks in advance.

Answer 1

Your used types have to be marked with the [DataContract] attribute. The properties have to be marked with the [DataMember] attribute.
Furthermore your fields should be public properties, because a datacontract doesn't make any sense with private fields only.
[DataContract]
public class Slideshow
{
[DataMember]
public String Name { get; set; }
[DataMember]
public String Path { get; set; }
[DataMember]
public List<Slide> Slides { get; set; }
}
[DataContract]
public class Slide
{
[DataMember]
public String Title { get; set; }
[DataMember]
public ContentTypeEnum ContentType { get; set; }
[DataMember]
public String TextContent { get; set; }
[DataMember]
public String PictureContextPath { get; set; }
}