"To clear all controls "

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3.00/5 (1 vote)

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hello
In my Form I had used multiple container such as panel,group box.and as per my requirement i have to clear all the controls which are reside in container. For this i have wrote a code as follows:-

foreach (Control  x in ControlContainer.Controls)//Error
           
            {
                

                if (x is System.Windows.Forms.TextBox)
                    ((TextBox)x).Text  = String.Empty;

                else  (x is System.Windows.Forms.ComboBox)
                {
                    ((ComboBox)x).SelectedIndex = -1;
                    ((TextBox)x).Text = String.Empty;
                }

But its not working properly.... i'm receiving error like:'object' does not contain a definition for 'Controls'

please help

[edit]Inline code converted to code block - OriginalGriff[/edit]

Posted 18-Apr-11 9:08am

curious_mind

Updated 18-Apr-11 9:11am

OriginalGriff

v2

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Henry Minute 18-Apr-11 16:48pm

From ricmil42 - posted in the wrong place (see below)

"Original Poster - you may want to look at the "Winform TextBox Properties" question. Specifically the recursive answer. It can be modified to clear any control as well as controls that contain controls (panel, group box, etc.)."

Sander Rossel 18-Apr-11 17:02pm

I was thinking the same thing :)
http://www.codeproject.com/Answers/183503/Winform-TextBox-Properties.aspx?cmt=86720#answer4

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OriginalGriff · Answer 1 · 2011-04-18T09:18:00

Solution 1

That makes sense , depending on what kind of object you are using. If ControlContainer is not an instance of an object that derives from Control, then it will not contain a Controls list. ControlContainer sounds like a class, rather than an instance?
Try:

GroupBox gb = new GroupBox();
...
foreach (Control x in gb)
   {
   ...
   }

Posted 18-Apr-11 9:18am

OriginalGriff

Comments

ricmil42 18-Apr-11 16:36pm

Original Poster - you may want to look at the "Winform TextBox Properties" question. Specifically the recursive answer. It can be modified to clear any control as well as controls that contain controls (panel, group box, etc.).

Sergey Alexandrovich Kryukov 18-Apr-11 21:51pm

You cover only one level (my vote of 5 anyway), but this code can be universal at practically the same price, please see my recursive solution.
--SA

Sergey Alexandrovich Kryukov · Answer 2 · 2011-04-18T15:50:00

You need to use recursion in this case:

static void CleanupTextBox(TextBox textBox) {
   //whatever cleanup you need
}
static void CleanupComboBox(ComboBox textBox) {
   //whatever cleanup you need
}
static void CleanupBoxes(Control parent) {
   TextBox textBox = parent as TextBox;
   ComboBox comboBox = parent as ComboBox;
   if (textBox != null)
      CleanupTextBox(textBox);
   else if (comboBox != null)
      CleanupComboBox(comboBox);
   foreach(Control control in parent.Controls)
      SetupTextBoxes(control);
}

//...

CleanupBoxes(myFormInstance);
or, in the method of your form:
CleanupBoxes(this);

—SA