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POVB.NET - Iterating through controls in a container object
 

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  1. POVB.NET - Iterating through controls in a container object
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    <p>I have a form with a "Clear" button.</p> <p>When the user clicks "Clear", I want to clear the value of all the visible elements on the form. In the case of date controls, I want to reset them to the current date.</p> <p>All of my controls are contained on a Panel.</p> <p>Right now, I'm doing this with the below code. Is there an easier way than manually checking for each control type? This method seems excessively unwieldy.</p> <p>To make matters worse, in order to recursively clear controls inside sub-containers (i.e., a group box within the panel) I have to repeat the whole monster with an overloaded "GroupBox" version.</p> <p><em>Edit: Thanks to your suggestions, the below code is greatly simplified.</em></p> <pre><code>Private Sub btnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClear.Click 'User clicks Clear, so clear all the controls within this panel ClearAllControls(panMid, True) 'True indicates that yes, i want to recurse through sub-containers End Sub ClearAllControls(ByRef container As Panel, Optional Recurse As Boolean = True) 'Clear all of the controls within the container object 'If "Recurse" is true, then also clear controls within any sub-containers Dim ctrl As Control For Each ctrl In container.Controls If (ctrl.GetType() Is GetType(TextBox)) Then Dim txt As TextBox = CType(ctrl, TextBox) txt.Text = "" End If If (ctrl.GetType() Is GetType(CheckBox)) Then Dim chkbx As CheckBox = CType(ctrl, CheckBox) chkbx.Checked = False End If If (ctrl.GetType() Is GetType(ComboBox)) Then Dim cbobx As ComboBox = CType(ctrl, ComboBox) cbobx.SelectedIndex = -1 End If If (ctrl.GetType() Is GetType(DateTimePicker)) Then Dim dtp As DateTimePicker = CType(ctrl, DateTimePicker) dtp.Value = Now() End If If Recurse Then If (ctrl.GetType() Is GetType(Panel)) Then Dim pnl As Panel = CType(ctrl, Panel) ClearAllControls(pnl, Recurse) End If If ctrl.GetType() Is GetType(GroupBox) Then Dim grbx As GroupBox = CType(ctrl, GroupBox) ClearAllControls(grbx, Recurse) End If End If Next End Sub </code></pre> <p>@Theraccoonbear: I like your suggestion, but when I change the declaration to this:</p> <pre><code>Private Sub ClearAllControls(ByRef controls As ControlCollection, Optional ByVal Recurse As Boolean = True) </code></pre> <p>Then this line gives me "Unable to cast object of type 'ControlCollection' to type 'ControlCollection'.":</p> <pre><code> ClearAllControls(panMid.Controls) </code></pre>
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