What is a better alternative to using generics with types only known at runtime in this case?

Question

Right now I can only use the Jumper class for objects of type "Something". I tried rewriting it as a generic class but ran into difficulties when actually calling it from my SomeForm class because "T" can be one of several types that I only know at runtime. I read that this means I am basically fighting the whole generics language design.

The sample code is VB but I could also work with C# answers.

Question: can this be redesigned with generics or what is a better alternative to generics in my case?

Public Class Jumper
    Private _enumeratorForwards As IEnumerator(Of Something)

    Public Sub JumpNext(functions As FunctionCombi)
        Forwards(functions.SelectorFunc)
    End Sub

    Private Iterator Function Forwards(selectorFunc As Func(Of Something, Boolean)) As IEnumerable(Of Something)

End Class

Public Class FunctionCombi
    Public Property SelectorFunc As Func(Of Something, Boolean)

    Sub New(_selectorFunc As Func(Of Something, Boolean))
        SelectorFunc = _selectorFunc
    End Sub

End Class

Public Class SomeForm

    'x and y would be different types
    Private _functionCombis As New Dictionary(Of SomeEnum, FunctionCombi) From {
                                                   {SomeEnum.A, New FunctionCombi(Function(x) RunSomeFunction(x)},
                                                   {SomeEnum.B, New FunctionCombi(Function(y) RunSomeOtherFunction(y))}

    Private Sub SomeHandler(sender as object, e as EventArgs)
        For i = 1 To [Enum].GetValues(GetType(SomeEnum)).Length

            'The type I would need here differs and I only know it at runtime

            Dim functionInfo As FunctionCombi = Nothing
            If Not _functionCombis.TryGetValue(i, functionInfo) Then Continue For
            Dim jumper As Jumper = sender.Tag(2)
        Next
    End Sub
End Class