Question

Microsoft Access: Programmatically Add CheckBox/Label With C#

Asked by: TheLearnedOne

I am trying to use Access Automation with C#, to programmatically add a CheckBox and a Label to a form.

Access 97 (I know, I know, I work for an insurance company)
C# 2005 SP1

Attempt below.

The code adds the CheckBox without error, but I am trying to add a Label to the CheckBox, and I get this error:

This property isn't available in Design view.  Switch to Form view to access this property, or remove the reference to the property.

internal void AddCheckBox()
        {
            CheckBox chk = (CheckBox)Global.AccessHelper.AddControl("Data Entry", AcControlType.acCheckBox, null);
            chk.Name = "chk" + Global.ClientID;
 
            Label label = (Label)Global.AccessHelper.AddControl("Data Entry", AcControlType.acLabel, chk as Control) as Label;
            label.Caption = string.Format("{0} ({1})", Global.ClientName, Global.ClientID);
        }
 
        public Control AddControl(string formName, AcControlType controlType, Control parent)
        {
            return (Control)this._Application.CreateControl(formName, controlType, AcSection.acDetail, parent, "", 
                0, 0, 100, 25);
        }

                                  
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Asked On
2009-03-24 at 08:51:40ID24259668
Tags

Access

,

Automation

,

C#

,

CreateControl

,

CheckBox

,

Label

Topics

Microsoft Visual C#.Net

,

Microsoft Access Database

,

Visual Studio

Participating Experts
1
Points
0
Comments
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Answers

 

by: LSMConsultingPosted on 2009-03-24 at 10:12:51ID: 23970736

If you're trying to add a label for the Checkbox, then you shouldn't have to ... it should already have a Label associated with it ... in VBA we'd refer to it like:

Checkbox.Controls(0)

But I'm not sure how you'd do that in C.

Also, adding controls and such to a runtime form is a bad idea. It will decompile your application, resulting in instability and possible corruption. Can you not simply add the checkbox and hide/show it as needed? That's the way it's done in Access.

 

by: TheLearnedOnePosted on 2009-03-24 at 10:23:41ID: 23970845

I know that adding controls to a form is a bad idea.  The database is off-line when I add controls, so I was not worried about instability.  I am investigating the possibility of automating a very significant list of manual updates (25 steps on a check list) to an Access database, which includes adding check box controls.  I just discovered yesterday that a CheckBox has a Label as a child control.  I didn't realize that the child control was added automagically.  

I have been digging through a lot of VBA code to understand this problem, so I just need the steps, not necessarily the C# code (I can handle that).

 

by: TheLearnedOnePosted on 2009-03-24 at 10:25:32ID: 23970864

I tried to call Application.CreateControl with AcControlType.CheckBox, and it added the CheckBox part, but not the Label.  

     CheckBox.Controls.Count = 0

 

by: TheLearnedOnePosted on 2009-03-24 at 10:44:12ID: 23971053

I figured out my own solution, and it was a guess on my part.  When I add a reference to the Access type library, it shows a lot of method arguments as object, which is a generic type.  Since I couldn't determine the specific argument type for the parent argument, I assumed that it was expecting the control itself.  It was expecting the name of the control.

Application.CreateControl(string FormName, AcControlType ControlType, AcSection Section, object Parent, object ColumnName, object Left, object Top, object Width, object Height).  

 

by: TheLearnedOnePosted on 2010-03-21 at 03:02:42ID: 31561952

I solved my own problem.

20120131-EE-VQP-002

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