In my Solution, create Generic Repository
public abstract class GenericRepository<C,T> : Repo.IGenericRepository<T>
where T : class
where C : DbContext, new(){
private C _entities = new C();
public C Context
{
get { return _entities; }
set { _entities = value; }
}
public virtual IQueryable<T> GetAll(
Expression<Func<T,object>> predicate,
Sorted _sort = Sorted.ASC,
int _max = 0,
int _skip = 0
) {
IQueryable<T> query = _sort == Sorted.ASC ? //Sorted is enum
_entities.Set<T>().OrderBy(predicate).Skip(_skip).Take(_max) :
_entities.Set<T>().OrderByDescending(predicate).Skip(_skip).Take(_max);
return query;
}
}
and call
var db = new JobRepository();
db.GetAll(e=>e.jcudate, sort, a, b).ToList();
error :
Unable to cast the type 'System.Nullable`1[[System.DateTime, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]' to type 'System.Object'. LINQ to Entities only supports casting EDM primitive or enumeration types.
but, If use
WSCEntities dbs = new WSCEntities();
dbs.jobservs.OrderBy(e=>e.jcudate).Skip(b).Take(a).ToList();
No problem at all.., Please suggest how I should solve the problem ?
Try using Func
delegate instead on Expression<Func>
public virtual IQueryable<T> GetAll(
Func<T,object> predicate,
Sorted _sort = Sorted.ASC,
int _max = 0,
int _skip = 0
) {
IQueryable<T> query = _sort == Sorted.ASC ? //Sorted is enum
_entities.Set<T>().OrderBy(predicate).Skip(_skip).Take(_max) :
_entities.Set<T>().OrderByDescending(predicate).Skip(_skip).Take(_max);
return query;
}
for more look at msdn documentation of OrderBy
method.