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Tip of the Day
Language: VB7
Expertise: Intermediate
Jul 21, 2003

InvokeMethod - Invoking a method via reflection

' Invoke a method via reflection and return its result - return null if method 
' doesn't exist or throws
' Note: requires Imports System.Reflection
'
' Example:
'    Function GetCompleteName(ByVal firstName As String,
'  ByVal lastName As String)
'       Return lastName & ", " & firstName
'    End Function
'    ...
'    MessageBox.Show(InvokeMethod(Me, "GetCompleteName", False, "Marco",
'  "Bellinaso"))

Function InvokeMethod(ByVal obj As Object, ByVal methodName As String, _
    ByVal throwIfError As Boolean, ByVal ParamArray args() As Object) As Object
    Try
        Return obj.GetType().InvokeMember(methodName, BindingFlags.Instance Or _
            BindingFlags.InvokeMethod Or BindingFlags.Public, Nothing, obj, _
            args)
    Catch ex As Exception
        If throwIfError Then Throw ex
    End Try
    ' if method doesn't exists or throws
    Return Nothing
End Function
Francesco Balena
 
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