Track Changes in navigation property - entity-framework-4

Question

public partial class ClaimEntities : DbContext
{
public ClaimEntities()
: base("name=ClaimEntities")
{
this.Configuration.LazyLoadingEnabled = false;
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}
public DbSet<ClaimInformation> ClaimInformations { get; set; }
public DbSet<ClaimInformation_HealthCareCode> ClaimInformation_HealthCareCode { get; set; }
}
}
public partial class ClaimInformation
{
public List<ClaimInformation_HealthCareCode> OtherDiagnosisCodes
{
get
{
return this.ClaimInformation_HealthCareCode.Where(c => c.CodeQualifier == "BF" || c.CodeQualifier == "ABF").ToList();
}
}
}
public partial class ClaimInformation
{
public ClaimInformation()
{
this.ClaimInformation_HealthCareCode = new ObservableListSource<ClaimInformation_HealthCareCode>();
}
public virtual ObservableListSource<ClaimInformation_HealthCareCode> ClaimInformation_HealthCareCode { get; set; }
}
ClaimInformation_HealthcareCodes is a navigation property on the entity ClaimInformation. 1-M between ClaimInformation and ClaimInformation_healthcareCodes. One Claim can have many ClaimHealthcareCodes.
This is how it is loaded in the context
_context.ClaimInformations.Include(h => h.ClaimInformation_HealthCareCode)
How do I make the context detect a change in the navigation property. In the code I am deleting a healthcareCode entry. This is a list in the ClaimInformationClass and is virtual. 1-M
this.claiminformation.claiminfo_healthcarecodes[i].remove(); This line is connected to the context.
private string GetTableName(DbEntityEntry dbEntry)
{
string entryName = dbEntry.Entity.GetType().Name;
int length = entryName.IndexOf('_');
TableAttribute tableAttr = dbEntry.Entity.GetType().GetCustomAttributes(typeof(TableAttribute),
false).SingleOrDefault() as TableAttribute;
string tableName = tableAttr != null ? tableAttr.Name : entryName.Substring(0,length);
return tableName;
}
This code returns the changed entry as 'ClaimInformation' which is partly true but it has to go a little deeper to to the navigation property which has a deleted entry.

Answer 1

private string GetTableName(DbEntityEntry ent)
{
ObjectContext objectContext = ((IObjectContextAdapter)this.context).ObjectContext;
System.Type entityType = ent.Entity.GetType();
if (entityType.BaseType != null && entityType.Namespace == "System.Data.Entity.DynamicProxies")
entityType = entityType.BaseType;
string entityTypeName = entityType.Name;
EntityContainer container =
objectContext.MetadataWorkspace.GetEntityContainer(objectContext.DefaultContainerName, DataSpace.CSpace);
string entitySetName = (from meta in container.BaseEntitySets
where meta.ElementType.Name == entityTypeName
select meta.Name).First();
return entitySetName;
}
Changed it to get the entity name instead of table name