Get / Retrieve all Fields of an Entity in MSCRM using C# ( RetrieveEntityRequest )

RetrieveEntityRequest aEntity = new RetrieveEntityRequest();

            aEntity.LogicalName = entityLogicanName;

          //only get published fields / attributes

            aEntity.RetrieveAsIfPublished = true;

            aEntity.EntityFilters = EntityFilters.All ;

            RetrieveEntityResponse resp = (RetrieveEntityResponse)service.Execute(aEntity);

            EntityMetadata getmetadata = resp.EntityMetadata;

            var crmAttributes = getmetadata.Attributes;

            attributes.Items.Clear();

            foreach (var attr in crmAttributes)

            {

                // filter can be used to get only Custom fields / or System fields with change

                if (attr.IsSecured == false && (attr.CanBeSecuredForUpdate == true || attr.CanBeSecuredForRead == true || attr.CanBeSecuredForCreate == true))

                    attributes.Items.Add(attr.LogicalName);

            }

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