LINQ的子名单问题

Question

我很新的LINQ和我有麻烦转换后面的LINQ表达式：

 Dim returnedInstructions As List(Of Integer) = New List(Of Integer) 
     For Each j As Job In response.Jobs 
      For Each i As Instruction In j.Instructions 
       returnedInstructions.Add(i.InstructionId) 
      Next 
     Next 

任何帮助表示赞赏。

Answer 1

你想SelectMany。

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（现在在VB中，我不知道这是否编译）

Dim returnedInstructions = response.Jobs _ 
    .SelectMany(Function(j) j.Instructions _ 
    .Select(Function(i) i.InstructionID)) _ 
    .ToList() 

Answer 2

我对VB并不太熟悉，所以如果这与C＃语法有些混淆，请致歉。

returnedInstructions = 
(from j in response.Jobs _ 
from i in j.Instructions _ 
select i.InstructionId).ToList(); 

Answer 3

像这样的东西应该工作：

Dim returnedInstructions As New List(Of Integer) 
    Dim q = From j In response.Jobs, i In j.Instructions Select i.InstructionID 
    returnedInstructions.AddRange(q)