LINQ选择语法VB.NET [英] LINQ Select Syntax VB.NET

问题描述

我有一个 Tuples 列表，我正在尝试执行 Select 和 Where 查询以返回 Objects列表来自 Tuple.Item5 参数.在我的where子句中，我希望将 Tuple.Item4 匹配到局部变量.

I have a list of Tuples I am trying to run a Select and Where query on to return a list of Objects from the Tuple.Item5 parameter. In my where clause I am looking to match Tuple.Item4 to a local variable.

我不确定选择"部分的VB.NET语法是什么，我只知道c#语法.

I'm not sure what the VB.NET syntax is for the Select portion, I only know the c# syntax.

基本上，我试图从我的元组列表中选择 Tuple.Item5 ，其中Tuple.Item4 = sCurID.我不确定应该在选择"部分中输入什么内容，尽管在c#中，我相信它将是 Select(t => t.Item5)

Essentially I am trying to select Tuple.Item5 from 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)

这就是我所拥有的:

listObj = listTuples.Select( Unsure What Goes Here ).Where(Function(w) w.Item4 = sCurID)

推荐答案

在C#或VB中应用 Select 后，将元组减小为 Item5 值并且无法访问 Item4 .最后执行 Select :

Once you apply the Select in C# or VB, you have reduced the Tuple to the Item5 value and can't access Item4. Do the Select last:

Dim listObj = listTuples.Where(Function(t) t.Item4 = sCurId).Select(Function(t) t.Item5)

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