LINQ 选择语法 VB.NET
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LINQ Select Syntax VB.NET
提问by Belgin Fish
I have a list of TuplesI am trying to run a Selectand Wherequery on to return a list of Objectsfrom the Tuple.Item5parameter. In my where clause I am looking to match Tuple.Item4to a local variable.
我有一个Tuples我正在尝试运行Select和Where查询的列表，以Objects从Tuple.Item5参数返回一个列表。在我的 where 子句中，我希望匹配Tuple.Item4一个局部变量。
I'm not sure what the VB.NET syntax is for the Select portion, I only know the c# syntax.
我不确定 Select 部分的 VB.NET 语法是什么，我只知道 c# 语法。
Essentially I am trying to select Tuple.Item5from my list of tuples where Tuple.Item4 = sCurID. I'm unsure as to what should go in the Select section although in c# I believe it would be Select(t => t.Item5)
本质上，我试图Tuple.Item5从我的元组列表中选择Tuple.Item4 = sCurID。我不确定 Select 部分应该包含什么，尽管在 c# 中我相信它会是Select(t => t.Item5)
This is what I have:
这就是我所拥有的：
listObj = listTuples.Select( Unsure What Goes Here ).Where(Function(w) w.Item4 = sCurID)
回答by NetMage
Once you apply the Selectin C# or VB, you have reduced the Tuple to the Item5value and can't access Item4. Do the Selectlast:
一旦你Select在 C# 或 VB 中应用了，你已经将元组减少到Item5值并且无法访问Item4. 做Select最后：
Dim listObj = listTuples.Where(Function(t) t.Item4 = sCurId).Select(Function(t) t.Item5)
回答by XardasLord
listObj = listTuples.Select(Function(t) t.Item5).Where(Function(w) w.Item4 = sCurID).ToList()
