Linq 2 SQL左连接与mono

Question

我不能得到下面的请求在Mono工作:没有连接，它将工作。当我只选择t1，它也工作，但我不能从两个表中选择的东西。我想我想要一个左连接，我总是在t1中有条目，如果NameOfFile匹配FileName，那么我想让表连接。

附加问题:我的查询何时执行?当我运行foreach循环时?

var result = (
            from t1 in db.Table1 
            join t2 in db.Table2 on t1.FileName equals t2.NameOfFile
            into joinDep                
            from t3 in joinDep.DefaultIfEmpty () 
            select new 
            {
            Time = t1.WriteTime,
            Name = t2.NameOfFile
            }
        )
        .OrderByDescending (c => c.Time.Date)
        .Take (10);
foreach (var entry in result)
{
    Console.WriteLine (entry.Name );
}

Answer 1

使用

var query = from t1 in db.Table1 
            join t2 in db.Table2 on t1.FileName equals t2.NameOfFile into gj
            from joinDep in gj.DefaultIfEmpty ()
            select new 
            {
               Time = t1.WriteTime,
               Name = joinDep.NameOfFile
            };
var result = query.OrderByDescending (c => c.Time.Date)
                .Take (10);

是的。Take使用延迟执行。