Find all "hard" properties on entity

   I need to filter out entity properties to avoid navigation properties.

I'm writing audit code, which should store all changes and currently it fails on getting "Original" value of navigation property. I need to collect all properties even keys for navigation properties. How do I filter this list?

foreach (var property in modifiedEntity.GetType().GetProperties())

                {

                    var oldValue = modifiedEntity.EntityAspect.GetValue(property.Name, EntityVersion.Original).ToString();

                    var newValue = modifiedEntity.EntityAspect.GetValue(property.Name, EntityVersion.Current).ToString();

                    if (oldValue.Equals(newValue)) continue;

                    auditEntry.SYSAuditDetails.Add(new SYSAuditDetail

                        {

                            SYSAudit = auditEntry,

                            FieldName = property.Name,

                            OldValue = oldValue,

                            NewValue = newValue

                        });

                }