I have declared a enum as below:
Public Enum Myenum
val1 = 0
val2 = 1
End Enum
Now I have a variable with the name
Dim str As String = "Myenum"
How can I use variable str to access the values of the enum?
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I not sure exactly what you're asking. Maybe you could provide some context?Hursey– Hursey2020-05-11 21:13:38 +00:00Commented May 11, 2020 at 21:13
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I have declared the enum as said in the question. Now I have received a string value programmatically in my program, say str with value "Myenum" and this value is the name of the enum I have declared. Now I want to use str dynamically to access the values of the enumtype Myenum. Is it possible?Meghdut Saha– Meghdut Saha2020-05-11 21:22:18 +00:00Commented May 11, 2020 at 21:22
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By context, really I'm ask what are you planning on doing with it. Passing an enum name around as a string seems odd, so trying to understand a little bit more about your situation so can give the best adviceHursey– Hursey2020-05-11 21:26:37 +00:00Commented May 11, 2020 at 21:26
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It could be as simple as if str = "Myenum" Then....Hursey– Hursey2020-05-11 21:27:26 +00:00Commented May 11, 2020 at 21:27
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I am working with a database where many tables are there, now after running a query I have received a name as "Myenum" which is the name of a table also. Now I want to use this variable of type string to access the values of previously declared enumtype.Meghdut Saha– Meghdut Saha2020-05-11 22:09:20 +00:00Commented May 11, 2020 at 22:09
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1 Answer
If the scope where the Enumerator is defined is a class object, you can use the current instance type to get a member corresponding to the Enumerator type name, using GetType().GetMember():
If the Enumerator(s) may not be public, specify BindingFlags that allow to include non-public members. Add BindingFlags.IgnoreCase if needed.
Imports System.Reflection
Dim enumTypeName = "MyEnum"
Dim flags = BindingFlags.Instance Or BindingFlags.NonPublic Or
BindingFlags.Public Or BindingFlags.IgnoreCase
Dim myEnumTypeInfo = Me.GetType().GetMember(enumTypeName, flags).FirstOrDefault()
If myEnumTypeInfo IsNot Nothing AndAlso Type.GetType(myEnumTypeInfo.ToString()).IsEnum Then
Dim myEnumValues = Type.GetType(myEnumTypeInfo.ToString()).GetEnumValues()
'[...]
End If
If the enumerator type is defined in a wider scope, you can use Assembly.GetExecutingAssembly() and get the type from DefinedTypes:
Dim myEnumType = Assembly.GetExecutingAssembly().
DefinedTypes.FirstOrDefault(Function(t) t.Name = enumTypeName)
If myEnumType IsNot Nothing AndAlso myEnumType.IsEnum Then
Dim myEnumValues = myEnumType.GetEnumValues()
'[...]
End If
