EDM POCO x WebService

Question

This is my source code of my class in EDM:

public class People
{
    public virtual int Id { get; set; }
    public virtual string FirstName { get; set; }
    public virtual string LastName { get; set; }
}

This is my source code of my web service:

public

 

 

class PeopleWS : System.Web.Services.WebService
{
    [WebMethod]
    public List<Sistema> SelectPeoples()
    {
        MyContext db = new MyContext();
        return (from q in db.People select q).ToList();
    }
}

When I execute the web service this error is returned:
System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: The type System.Data.Entity.DynamicProxies.People_09C9616929F8A9A58DFD553684CF043860C1241DFD5E18195F34AFC1D05275B1 was not expected. Use the XmlInclude or SoapInclude attribute to specify types that are not known statically.

How do I solve this problem?

Answer 1

Hi Julio,

WCF serialization is not supported with POCO proxy types in beta 2. There is an explanation about this in the readme file. There is a workaround but it is relatively complicated and requires the definition of a DataContractResolver. I don't have the code at hand. In the meanwhile the recommendation is to disable proxies when creating objects that are going to be serialized. You can do this in ContextOptions.ProxyCreationEnabled = false.

Hope this helps,
Diego

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Answer 2

Hi Diego, thank you very much! Perfect!