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Delegate error “Error binding to target method.”

Posted on 2011-03-02
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Last Modified: 2012-05-11
Hi,

I was wondering if someone is able to help. Please refer to the attached code snippet.
I have created a sub that populates a screen with panels. It is my intention that when a panel is clicked the following method is triggered “PanelClick”.

This method is located within the objSenderForm object that I pass through. I have confirmed during runtime that this can be triggered correctly by doing the following in the immediate window:

DirectCast(objSenderForm,PDM.frmLoadForm).PanelClick

PanelClick is set to only return a message box and I can confirm that this functions correctly.

The issue is that I receive the following error message “Error binding to target method.” When the following line is being executed:

Dim obj_event_delegate As [Delegate] = [Delegate].CreateDelegate(obj_event_info.EventHandlerType, DirectCast(objSenderForm, PDM.frmLoadForm), strHandler)

I am unsure how to resolve this issue.

The target is the same as the passed in object that the controls are being added and the strEvent is = to “MouseClick” and the handler is = “PanelClick” which is a public method within frmLoadForm (the passed in object).

Any help would be appreciated. I have possibly just been looking at this too long.

Regards,

Ross

Public Sub getNewPanel(ByVal xCord As Integer, ByVal yCord As Integer, _
                                ByVal height As Integer, ByVal width As Integer, _
                                ByVal strEvent As String, ByVal strHandler As String, _
                                ByVal strQuestion As String, ByVal strControl As String, _
                                ByVal strContronName As String, ByVal strSendTo As String, _
                                ByVal booEnabled As Boolean, _
                                ByVal objSenderForm As Object)

        objPanel = New Panel

        objPanel.Height = height
        objPanel.Width = width
        objPanel.Text = ""
        objPanel.BackColor = Color.Blue
        objPanel.Name = strContronName
        objPanel.Enabled = booEnabled
        objPanel.Location = New System.Drawing.Point(xCord, yCord)
        DirectCast(objSenderForm, PDM.frmLoadForm).Controls.Add(objPanel)


        If strHandler <> "" Then
            Dim obj_type = objPanel.GetType

            Dim obj_event_info = obj_type.GetEvent(strEvent, Reflection.BindingFlags.Instance Or Reflection.BindingFlags.Public)
            Dim obj_event_delegate As [Delegate] = [Delegate].CreateDelegate(obj_event_info.EventHandlerType, DirectCast(objSenderForm, PDM.frmLoadForm), strHandler)
            'objSenderForm
            'DirectCast(Me.objSenderForm,PDM.frmLoadForm)

            obj_event_info.AddEventHandler(objPanel, obj_event_delegate)
            obj_event_delegate = Nothing
        End If


    End Sub

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Question by:ross13
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Accepted Solution

by:
Bob Learned earned 500 total points
ID: 35028644
1) What does "strHandler" do for you, that you need to check for an empty string?

2) Usually, when adding an event handler, I would do something like this:

Dim panel As New Panel()
Dim textBox As New TextBox()

panel.Controls.Add(textBox)

Me.Controls.Add(panel)

AddHandler panel.Click, AddressOf PanelClickHandler

...

Private Sub PanelClickHandler(ByVal sender As Object, ByVal e As EventArgs)
End Sub

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