IQueryable with Entity Framework - order, where, skip and take have no effect

问题

I'm using Entity Framework (code first) like this:

IQueryable<StammdatenEntityModel> query = dbSet;

query.OrderByDescending(s => s.CreateDateTime);

query.Where(s => s.Deleted == false);

if(!String.IsNullOrEmpty(keyword))
{
    query.Where(s => s.SerialNumber.Contains(keyword)); //simplified for SO
}

query.Skip(skip);
query.Take(take);

However the OrderByDescending, Where, Skip and Take don't have any effect.

回答1:

You are not using the result of query

IQueryable<StammdatenEntityModel> query = dbSet;
query = query.OrderByDescending(s => s.CreateDateTime);
query = query.Where(s => s.Deleted == false);
if(!String.IsNullOrEmpty(keyword))
{
    query = query.Where(s => s.SerialNumber.Contains(keyword)); //simplified for SO
}
query = query.Skip(skip);
query = query.Take(take);

来源：https://stackoverflow.com/questions/45432279/iqueryable-with-entity-framework-order-where-skip-and-take-have-no-effect