f# - 在 F# 中没有值的成员

Question

我正在尝试将以下 C# 代码转换为 F#:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
private class DOCINFOA
{
    [MarshalAs(UnmanagedType.LPStr)]
    public string nomeDocumento;
    [MarshalAs(UnmanagedType.LPStr)]
    public string arquivoSaida;
    [MarshalAs(UnmanagedType.LPStr)]
    public string tipoDado;
}

我正在做以下事情:

namespace Printer
    module RawPrinterHelper =
            [<StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)>]
            type DOCINFOA =
                [<MarshalAs(UnmanagedType.LPStr)>]
                member this.nomeDocumento
                [<MarshalAs(UnmanagedType.LPStr)>]
                member this.arquivoSaida
                [<MarshalAs(UnmanagedType.LPStr)>]
                member this.tipoDado

但我收到:类型定义需要一个或多个成员。我可以让这些成员为空吗？

Answer 1

您可以使用 val 代替 member:

[<StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)>]
type DOCINFOA =
    [<MarshalAs(UnmanagedType.LPStr)>]
    val nomeDocumento : string
    [<MarshalAs(UnmanagedType.LPStr)>]
    val arquivoSaida : string
    [<MarshalAs(UnmanagedType.LPStr)>]
    val tipoDado : string