枚举值的通用数组？

发布于 2024-07-17 07:26:12 字数 544 浏览 5 评论 0原文

我目前正在 VB.NET 中编写一个辅助函数，将枚举值数组转换为 CSV，但我遇到了一些困难......

我不确定如果我想让它足够通用来处理我传递给它的任何枚举。

这就是我到目前为止所得到的：

Public Shared Function EnumArrayToCSV(ByVal values() As System.Enum) As String
    Dim result As Generic.List(Of String) = New Generic.List(Of String)

    For i As Integer = 0 To values.GetUpperBound(0)
        result.Add(Convert.ToInt32(values(i)))
    Next i

    Return String.Join(",", result.ToArray)
End Function

我意识到这个争论是不正确的，因为我正在使用一组枚举。理想情况下，我希望使用一组通用的枚举值。

有人可以帮忙吗？

原文

I'm currently writing a helper function in VB.NET to convert an array of enum values to a CSV, but I'm encounting a few difficulties....

I'm not sure what type of arguement my function should take if I want to make it generic enough to handle any enum I pass into it.

This is what I've got so far:

Public Shared Function EnumArrayToCSV(ByVal values() As System.Enum) As String
    Dim result As Generic.List(Of String) = New Generic.List(Of String)

    For i As Integer = 0 To values.GetUpperBound(0)
        result.Add(Convert.ToInt32(values(i)))
    Next i

    Return String.Join(",", result.ToArray)
End Function

I realise that the arguement is incorrect as I am working with an array of enums. Ideally, I'd like to be working with a generic set of enum values.

Can anyone help?

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还给你自由 2024-07-24 07:26:12

Public Shared Function CSVFromEnumValues(Of T)(ByVal values As IEnumerable(Of T)) As String
    Dim sb As New StringBuilder()

    Dim delimiter As String = ""
    For Each item As T In values
        sb.Append(delimiter).Append(Convert.ToInt32(item).ToString())
        delimiter = ","
    Next item

    return sb.ToString()
End Function

关于此代码的一些注释：

我开始更喜欢 TypeFromType() 而不是 TypeToType() 命名约定，因为它将类型放置在包含它们的变量附近，而不是相反。
此代码将接受一个数组。它还接受列表或您能想到的大多数其他集合。这是一件好事——它使您的代码更加强大和灵活。
此代码不限于枚举值，但枚举值只是一种类型。这些值本身没有什么特别的。这其实并不是一件坏事。它仍然适用于枚举值，因此您可以很好地使用它。它适用于其他项目并不一定是一个缺陷。

Public Shared Function CSVFromEnumValues(Of T)(ByVal values As IEnumerable(Of T)) As String
    Dim sb As New StringBuilder()

    Dim delimiter As String = ""
    For Each item As T In values
        sb.Append(delimiter).Append(Convert.ToInt32(item).ToString())
        delimiter = ","
    Next item

    return sb.ToString()
End Function

Some notes on this code:

I have come to prefer the TypeFromType() rather than TypeToType() naming convention, because it places the types near the variable that contain them rather than the reverse.
This code will accept an array. It will also accept a list or most any other collection you can think of. This is a good thing- it makes your code more powerful and flexible.
This code is not restricted to enum values, but enum values are just a type. There's nothing special about the values themsevles. This isn't really a bad thing. It still works for enum values, so you can use it just fine. That it works for other items isn't necessarily a flaw.

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