如何列出枚举成员 [英] How to list Enum's members

问题描述

如何在代码中列举枚举成员？我有以下枚举：

  Public Enum TestEnum As int32 
 First = 0 
 Second = 2 
第三= 4 
第四= 6 
结束枚举
  

通过以下代码列出TestEnum的所有成员，但失败：

 公共类Form1 
 
私有子Button1_Click（sender As System.Object，e As System.EventArgs）处理Button1.Click 
 Dim Enum1 As TestEnum 
 
 Dim Members（）As String 
 
成员= System.Enum.GetNames（CType（Enum1，System.Enum））
 
 
 End Sub 
结束类
  

所以，我的问题是：如何列出枚举成员？

更新：解决方案是：

 公共类Form1 
 
 Private Sub Button1_Click（sender As System.Object ，e As System.EventArgs）Handles Button1.Click 
 Dim Members（）As String 
 Members = System.Enum.GetNames（GetType（TestEnum））
 
 MessageBox.Show（Join（Members，Chr（13）& Chr（10）））
 
 End Sub 
结束类
  

解决方案

你需要传递一个类型而不是一个值，方法。

 成员= System.Enum.GetNames（GetType（TestEnum））
  

如果您有一个枚举的实例你也可以使用

  Members = System.Enum.GetNames（Enum1.GetType（））
  

尽管如果您知道所需的类型，我会推荐第一种方法。

How to list Enum's members in code? I have following Enum:

Public Enum TestEnum As int32
    First = 0
    Second = 2
    Third = 4
    Fourth = 6
End Enum

And I try to list all members of TestEnum via following code but it failed:

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim Enum1 As TestEnum

        Dim Members() As String

        Members = System.Enum.GetNames(CType(Enum1, System.Enum))


    End Sub
End Class

So, my question is: How to list members of a Enum?

Update: The solution is:

Public Class Form1

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim Members() As String
        Members = System.Enum.GetNames(GetType(TestEnum))

        MessageBox.Show(Join(Members, Chr(13) & Chr(10)))

    End Sub
End Class

解决方案

You need to pass a type, not a value, to the method.

Members = System.Enum.GetNames(GetType(TestEnum))

If you have an instance of your enum you can also use

Members = System.Enum.GetNames(Enum1.GetType())

Though I would recommend the first approach if you know the type you want.

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