"IQueryable and IEnumerable"区别

class Program
{
static void Main(string[] args)
{
List<int> ints = new List<int>();
for (int i = 0; i < 1000; i++)
{
ints.Add(i);
}

// 延时加载，在数据库中筛选；
//lazy loading， filter from database
IQueryable<int> query1 = (from c in ints
where c > 50
select c).AsQueryable();
var res1 = query1.Where(r => r > 50);

// 立即加载，同时，在内存中筛选
// filter in memory
IEnumerable<int> query2 = from c in ints
where c > 50
select c;
var res2 = query2.Where(r => r > 50);

// 默认是IEnumerable
// default is IEnumerable
var query3 = from c in ints
where c > 50
select c;
var res3 = query3.Where(r => r > 50);

}
}