public List <T> QueryByMultiCondition <TKey>(Expression <Func <T, bool> > whereLambda, int pageindex
, int pagesize
, out int totalcount
, Expression <Func <T, TKey> > order)
{
//1.0 计算跳过的总行数
int skipCount = (pageindex - 1) * pagesize;
//2.0 获取满足条件的总行数
totalcount = _dbset.AsExpandable().Where(whereLambda).Count();
//totalcount = _dbset.Count(whereLambda);
return(_dbset.AsExpandable().Where(whereLambda).AsQueryable().OrderByDescending(order).Skip(skipCount).Take(pagesize).ToList());
}