vb.net - 如何初始化包含结构和简单元素混合的结构对象？

Question

使用VB.NET 2017，我声明了一个有两个成员的结构，一个是结构，另一个是字符串，如下:

Structure InpFile
    Dim name As String
    Dim reader As StreamReader
    Dim lineIn As String
    Dim lineNum As Integer
End Structure

Structure Opts
    Dim fin As InpFile
    Dim name As String
End Structure

Opts 类型的对象如何在声明时初始化？

例如，一次尝试无效:

Dim obj as Opts = {.fin.name = "filename.txt", .fin.lineNum = 0, .name = "JohnnyMnemonic"}

Answer 1

您必须使用 With声明。

Dim obj As New Opts With {.fin = New InpFile With {.name = "filename.txt", .lineNum = 0}, .name = "JohnnyMnemonic"}