Question

我有以下类型：

and ListInfo() =

let mutable count = 0

// This is a mutable option because we can't have an infinite data structure.
let mutable lInfo : Option<ListInfo> = None

let dInfo = new DictInfo()
let bInfo = new BaseInfo()

member this.BaseInfo = bInfo
member this.DictInfo = dInfo

member this.LInfo
    with get() = lInfo
    and set(value) = lInfo <- Some(value)

member this.Count
    with get() = count
    and set(value) = count <- value

其中递归“列表信息”是一个选项。有一个或没有。我需要从C＃中使用它，但我得到错误。这是一个示例用法：

if (FSharpOption<Types.ListInfo>.get_IsSome(listInfo.LInfo))
{
    Types.ListInfo subListInfo = listInfo.LInfo.Value;
    HandleListInfo(subListInfo, n);
}

这里listInfo的类型为ListInfo，如上所示。我只是想检查它是否包含值，如果是，我想使用它。但是所有访问listInfo.LInfo都会给出错误“语言不支持属性，索引器或事件listInfo.LInfo ......”

任何了解原因的人？

Answer 1

我怀疑问题是LInfo属性getter / setter使用不同类型（C＃不支持）。

试试这个

member this.LInfo
    with get() = lInfo
    and set value = lInfo <- value

或者这个

member this.LInfo
    with get() = match lInfo with Some x -> x | None -> Unchecked.defaultof<_>
    and set value = lInfo <- Some value

在C＃中使用F＃选项类型

1 个答案: