获取我在函数中用作参数的枚举值

Question

例如：

Enum parameter1Choices
 choice1
 choice2
End Enum

Function sampleFunction(parameter1 as parameter1Choices)
 return parameter1
End Function

所以如果我像这样使用上面的函数

sampleFunction(parameter1Choices.choice1)

我预计它将 return choice1 为 string

我读过 this，它说我应该使用 Enum.GetName，有些人说 .ToString。我该如何使用它？

Answer 1

好像答案是

Function sampleFunction(parameter1 As parameter1Choices) As String
    Return [Enum].GetName(GetType(parameter1Choices), parameter1)
End Function

Answer 2

只需使用ToString:

Function sampleFunction(parameter1 As parameter1Choices) As String
    Return parameter1.ToString()
End Function

Answer 3

如果速度是个大问题，您可以尝试在字典中查找值

Public Enum ParameterChoice
    None
    FirstChoice
    SecondChoice
End Enum

Imports System
Imports System.Collections.Generic

Public Class ChoicesLookup
    Private Shared _enumLookup As Dictionary(Of ParameterChoice, String)
    Shared Sub New()
        _enumLookup = New Dictionary(Of ParameterChoice, String)
        For Each choice As ParameterChoice In [Enum].GetValues(GetType(ParameterChoice))
            _enumLookup.Add(choice, choice.ToString())
        Next
    End Sub

    Public Shared Function GetChoiceValue(myChoice As ParameterChoice) As String
        GetChoiceValue = _enumLookup(myChoice)
    End Function

    'prevents instantiation
     Private Sub New()
     End Sub
End Class

Imports System.Text
Imports Microsoft.VisualStudio.TestTools.UnitTesting

<TestClass()> Public Class UnitTest1

    <TestMethod()> Public Sub TestMethod1()
        Assert.AreEqual("FirstChoice", ChoicesLookup.GetChoiceValue(ParameterChoice.FirstChoice))
    End Sub
End Class

获取我在函数中用作参数的枚举值

Get the value of the enum that I used as parameter in my function

.net

vb.net

enums

tostring