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03.10.2005 at 04:30AM PST, ID: 21345255
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8.0

Reflection to create objects and then invoke (.VB or C#)

Asked by fceledon in .NET

Tags: ,

I will like to have a generic form to test my forms. The idea is to show a Listbox with the public types defined in the application, display them in a ListBox, and let me select from the listbox what form to run. I want to use this generic form on any project, so I will not have to "wire" it.

This is a non working sample: the myType.InvokeMethod statement is incorrect. I need to create the object first. I need a sort of Application.Run() on the button1_click, however, not sure how to create an object using reflection to use it.

Question are:
using System.Reflection,
          How do you "create" an object knowing it's "Type"
          What method is invoked to "run" the previously created object.

<PRE>
' Requires ListBox1 and a Button1
' Using a support class to store Type and display just the "Name" in the listbox
'
    Dim myAssembly As System.Reflection.Assembly
    Private Class xMod
        Public Type As Type
        Public Sub New(ByVal Type As Type)
            Me.Type = Type
        End Sub
        Public Overrides Function ToString() As String
            Return Type.Name
        End Function
    End Class
    Private Sub Runner_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        myAssembly = System.Reflection.Assembly.GetEntryAssembly()
        For Each [MyModule] As System.Reflection.Module In myAssembly.GetModules(False)
            Debug.WriteLine(MyModule.FullyQualifiedName)    ' may be just one...
            For Each myType As System.Type In MyModule.GetTypes()
                ListBox1.Items.Add(New xMod(myType))
            Next
        Next
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim app As xMod
        app = CType(ListBox1.SelectedItem, xMod)
        Dim myType As Type = app.Type
        myType.InvokeMember("Show", _
            Reflection.BindingFlags.Default Or _
            Reflection.BindingFlags.InvokeMethod Or _
            System.Reflection.BindingFlags.Static, _
            Nothing, Nothing, New Object() {})
    End Sub
</PRE>
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[+][-]03.10.2005 at 04:52AM PST, ID: 13505337

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[+][-]03.10.2005 at 08:20AM PST, ID: 13507610

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About this solution

Zone: .NET
Tags: invoke, reflection
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Solution Provided By: ariellive
Participating Experts: 2
Solution Grade: A
 
 
[+][-]03.10.2005 at 09:20AM PST, ID: 13508364

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