WCF测试客户端错误

Question

I am running my WCF service with Entity Framework.

public List<Website> getWebsites()
{
        try
        {
            using (MyInfoEntities ent = new MyInfoEntities())
            {
                return ent.Websites.ToList();
            }
        }
        catch (Exception e)
        {
            throw e;
        }
}

But when I invoke my service using Visual Studio 2012 I get an error:

Failed to invoke the service.
Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.

As I am totally new to WCF I don't know where to search and what to do.

Answer 1

Your probably not going to be able to return an entity framework object like that directly. Complex objects that are returned from WCF need to be wrapped around a DataContract attribute such as the following:

    [DataContract]
    public class Website
    {
        [DataMember]
        public long idWebsite{ get; set; }

        [DataMember]
        public string Name{ get; set; }

        [DataMember]
        public string MacAddHostess { get; set; }
     }