.net - 如何在 VB.NET 中声明嵌套函数？

Question

如何在 VB.NET 中声明嵌套函数？例如，我想做这样的事情:

Function one()
    Function two()
    End Function
End Function

但是这个语句在VB.NET中是无效的，因为函数没有关闭。

Answer 1

你是问怎么写lambda expression ?

A lambda expression is a function or subroutine without a name that can be used wherever a delegate is valid. Lambda expressions can be functions or subroutines and can be single-line or multi-line. You can pass values from the current scope to a lambda expression.

You create lambda expressions by using the Function or Sub keyword, just as you create a standard function or subroutine. However, lambda expressions are included in a statement.

例如，以下代码将打印“Hello World!”:

Dim outputString As Action(Of String) = Sub(x As String)
                                            Console.WriteLine(x)
                                        End Sub
outputString("Hello World!")

有关更多示例，请参见此处: VB.NET Lambda Expression