Datacontract exception. Cannot be serialized

Question

I have the following WCF DataContract:

[DataContract]
public class Occupant
{
    private string _Name;
    private string _Email;
    private string _Organi         


        

Answer 1

Try adding an empty constructor. Often times that will set off the serializer.

Answer 2

Because you have provided one or more initializing constructors, you will also need to add a parameterless (default) constructor.

i.e. You need to add:

[DataContract]
public class Occupant
{
    // *** Needed only for Serialization
    public Occupant() {}
    ...

This is because the default constructor disappears when you add an explicit constructor.

[The issue isn't with the method returning List<Occupant>, since methods aren't serialized).]

Answer 3

You need a default parameterless constructor. I don't ever plan to actually use mine, so I added a summary for IntelliSense and throw a run-time exception to keep it from being used.

/// <summary>
/// parameterless default constructor only for serialization
/// </summary>
public MyClass() { throw new NotImplementedException("parameterless default constructor only for serialization"); }

Answer 4

My guess would be because _Email is not initialized. You could set EmitDefaultValue to false and see if that helps:

[DataMember(EmitDefaultValue = false)]
public string Email
{

Answer 5

When you have NO setter by default, do these steps:

1. Add parametreless constructor;
2. And add private set at least.

This helps me.

Answer 6

You should add an empty parameter constructor to your datacontract class