Linq子列表问题

我对Linq非常陌生，在将以下内容转换为Linq表达式时遇到困难：

        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 

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谢谢你的帮助

我对VB不太熟悉，如果这与C#语法有点混淆，我深表歉意

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像这样的方法应该会奏效：

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

你想要的

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我以前尝试过这个确切的示例，但它返回IEnumberable和not IEnumberable。您确定这正是您所尝试的吗？double from应该转化为对SelectMany的调用（根据David的回答），ToList将以列表而不是IEnumerableThanks的形式返回，您的示例非常有效。我将更深入地了解SelectMany。

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

List<int> returnedInstructions = response.Jobs
  .SelectMany(j => j.Instructions
    .Select(i => i.InstructionID))
  .ToList();

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