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GermanAndy
GermanAndy

Reputation: 37

Reflecting Enum Values in an external Assembly

My aim is to enumerate DLLs in a folder, look for classes that conform to a specific interface and then query those classes for enum values. The idea being that I want to query what 'Outcome' possibilities are supported.

I have my DLLs lined up and can see the classes which conform to the correct interface, that is working, but the next step is to search the class for a specific enum and get the values, I have been using the following code:

Private Sub GetOutcomeEnumValues(ByVal AssemblyPath As String, ByVal ClassName As String)
        Dim ReflectedAssembly As Assembly
        Dim ReflectedClass As Type
        'Load DLL
        ReflectedAssembly = System.Reflection.Assembly.LoadFrom(AssemblyPath)
        'Load Class
        ReflectedClass = ReflectedAssembly.GetType(ClassName)
        'Load members
        Dim Members() As MemberInfo
        Members = ReflectedClass.GetMembers
        For i As Integer = 0 To Members.Count - 1
            'Check for the Outcomes enumeration
            If (Members(i).Name = "Outcomes") Then
                Dim Outcomes As System.Array
                Outcomes = Members(i).GetType.GetEnumValues
            End If
        Next
    End Sub

The problem I have is that I cannot seem to get Members(i) to give me the enum values - even though I KNOW this Member is an enumeration. When I call 'GetEnumValues' an exception is thrown:

"Type provided must be an Enum. Parameter name: enumType"

The class I am querying looks something like this

Public Class Foo
    Public Enum Outcomes
        OK
        Cancel
    End Enum
End Class

Upvotes: 1

Views: 1154

Answers (1)

GermanAndy
GermanAndy

Reputation: 37

Got it, after experimenting a little, I used the following code to good effect:

Private Sub GetOutcomeEnumValues(ByVal AssemblyPath As String, ByVal ClassName As String)
    Dim ReflectedAssembly As Assembly
    Dim ReflectedClass As Type
    'Load DLL
    ReflectedAssembly = System.Reflection.Assembly.LoadFrom(AssemblyPath)
    'Load Class
    ReflectedClass = ReflectedAssembly.GetType(ClassName & "+ Outcomes")
    'Load members
    Dim OutcomeNames() As String = ReflectedClass.GetEnumNames

End Sub

Upvotes: 1

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