C# Select子句null

我目前正在使用

your = from p in (toSelect)
select new
{
  last = p.Last,
  current = p.CurrentPlayer,
  seats = from s in (p.Seated)
  select new
  {
      UID = s.UID,
      buyin = s.BuyIn
  }
}

p.UID

是一个数组，如何在每次

s.UID

未设置时传递

null

？我知道“

where

”但我想知道哪些座位是免费的（例如

null

）

your = from p in (toSelect)
select new
{
  last = p.Last,
  current = p.CurrentPlayer,
  seats = from s in (p.Seated)
  select new
  {
      UID = s.UID,
      buyin = s.BuyIn
  }
}

希望这足够清楚。

您可以尝试以下方法：

your = from p in (toSelect)
select new
{
  last = p.Last,
  current = p.CurrentPlayer,
  seats = from s in (p.Seated)
  select new
  {
      UID = s.UID,
      buyin = s.BuyIn
  }
}

your = from p in (toSelect)
select new
{
  last = p.Last,
  current = p.CurrentPlayer,
  seats = p.Seated.Select(s => s.UID != null
    ? new
      {
          UID = s.UID,
          buyin = s.BuyIn
      }
    : null;
}

---

将分配给

座位的表达式替换为：

your = from p in (toSelect)
select new
{
  last = p.Last,
  current = p.CurrentPlayer,
  seats = from s in (p.Seated)
  select new
  {
      UID = s.UID,
      buyin = s.BuyIn
  }
}

seats = p.Seated.Select(s => s != null ? new { UID = s.UID, buyin = s.BuyIn } : null)

希望这足够清楚

your = from p in (toSelect)
select new
{
  last = p.Last,
  current = p.CurrentPlayer,
  seats = from s in (p.Seated)
  select new
  {
      UID = s.UID,
      buyin = s.BuyIn
  }
}

老实说。还不够清楚。
s.UID
是否为可空类型，这就是我们需要与
null
进行比较的原因？
unset是什么意思？您所说的“pass
null
”是什么意思？
your = from p in (toSelect)
select new
{
  last = p.Last,
  current = p.CurrentPlayer,
  seats = from s in (p.Seated)
  select new
  {
      UID = s.UID,
      buyin = s.BuyIn
  }
}