WCF ODATA : The entity type 'Com.DAL.Country' does not have any key properties. Please make sure that one or more key properties are defined for this entity type.

[Samuel]

I'm having this error when trying to access my WCF DataService. The country mapping is the following:

        public MappingConfiguration MapEntity()
        {
            MappingConfiguration<Country> mapping = new MappingConfiguration<Country>();
            mapping.MapType().ToTable("Country");
 
            mapping.HasProperty(x => x.Id).WithConverter("OpenAccessRuntime.Data.Bytes2GuidConverter").HasColumnType("raw(16)").IsIdentity();
            mapping.HasProperty(x => x.Version).IsVersion();
 
            return mapping;
        }


The model class:

       
    public partial class Country : BaseEntity
    {
      //some properties here
    }

    public partial class BaseEntity
    { 
        [Required()]
        [Key()]      
        public virtual Guid Id { get; set; } 
    }

The error occurs in the OpenAccessMetadataProvider, in method MakeConfigurationReadOnly method

What could be the problem  ? 

[Viktor Zhivkov]

Hello Samuel,

If you are using Horizontal Inheritance for the Country entity type you have to define the Id property in the Country class. See this article on mapping types with Horizontal inheritance.

If it is not the case, please send us details about your whole inheritance chain and the mapping for each participating entity type.

Regards,
Viktor Zhivkov
Telerik