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.NET2017，我声明了一个结构体，它有两个成员，一个是结构体，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

如何在声明时初始化 Opts 类型的对象？

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 语句。

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

如何初始化包含结构和简单元素混合的结构对象？

How to initialize a structure object containing a mix of structure and simple elements?

vb.net

initialization

object-initializers

visual-studio-2017