Foreach Control in form how can I do something to all the TextBoxes in my Form

Question

How can I use a Foreach Statement to do something to my TextBoxes   foreach  Control X in this Controls        Check if the controls is a TextBox  if it is delete it s  Text letters

User · Answer

foreach  Control X in this Controls      if  X is TextBox           X as TextBox  Text   string Empty

User · Answer

Also you can use LINQ  For example for clear Textbox text do something like   this Controls OfType lt TextBox gt    ToList   ForEach t   gt  t Text   string Empty

User · Answer

foreach  Control x in this Controls      if  x is TextBox            TextBox x  Text   String Empty    instead of above line we can use            x resetText

User · Answer

If you are using C  3 0 or higher you can do the following  foreach   TextBox tb in this Controls OfType lt TextBox gt                Without C  3 0 you can do the following  foreach   Control c in this Controls       TextBox tb   c as TextBox    if   null    tb                     Or even better  write OfType in C  2 0     public static IEnumerable lt T gt  OfType lt T gt  IEnumerable e  where T   class      foreach   object cur in e         T val   cur as T      if   val    null           yield return val               foreach   TextBox tb in OfType lt TextBox gt  this Controls

User · Answer

private IEnumerable lt TextBox gt  GetTextBoxes Control control        if  control is TextBox textBox                yield return textBox             if  control HasChildren                foreach  Control ctr in control Controls                        foreach  var textbox in GetTextBoxes ctr                                 yield return textbox

User · Answer

You re looking for  foreach  Control x in this Controls      if  x is TextBox            TextBox x  Text   String Empty

User · Answer

The trick here is that Controls is not a List lt  gt  or IEnumerable but a ControlCollection   I recommend using an extension of Control that will return something more  queriyable     public static IEnumerable lt Control gt  All this ControlCollection controls                foreach  Control control in controls                        foreach  Control grandChild in control Controls All                    yield return grandChild               yield return control                    Then you can do    foreach var textbox in this Controls All   OfType lt TextBox gt            Apply logic to the textbox here

User · Answer

Check this   foreach  Control x in this Controls        if  x is TextBox                x Text

User · Answer

Just add other control types   public static void ClearControls Control c         foreach  Control Ctrl in c Controls                  Console WriteLine Ctrl GetType   ToString               MessageBox Show    Ctrl GetType   ToString               switch  Ctrl GetType   ToString                           case  System Windows Forms CheckBox                     CheckBox Ctrl  Checked   false                  break               case  System Windows Forms TextBox                     TextBox Ctrl  Text                       break               case  System Windows Forms RichTextBox                     RichTextBox Ctrl  Text                       break               case  System Windows Forms ComboBox                     ComboBox Ctrl  SelectedIndex   -1                    ComboBox Ctrl  SelectedIndex   -1                  break               case  System Windows Forms MaskedTextBox                      MaskedTextBox Ctrl  Text                       break               case  Infragistics Win UltraWinMaskedEdit UltraMaskedEdit                     UltraMaskedEdit Ctrl  Text                       break               case  Infragistics Win UltraWinEditors UltraDateTimeEditor                   DateTime dt   DateTime Now                  string shortDate   dt ToShortDateString                      UltraDateTimeEditor Ctrl  Text   shortDate                  break               case  System Windows Forms RichTextBox                     RichTextBox Ctrl  Text                       break                case   Infragistics Win UltraWinGrid UltraCombo                     UltraCombo Ctrl  Text                       break               case  Infragistics Win UltraWinEditors UltraCurrencyEditor                     UltraCurrencyEditor Ctrl  Value   0 0m                  break               default                  if  Ctrl Controls Count  gt  0                      ClearControls Ctrl                   break

User · Answer

You can do the following   foreach  Control X in this Controls        TextBox tb   X as TextBox      if  tb    null                string text   tb Text             Do something to text            tb Text   string Empty     Clears it out

User · Answer

I found this to work very well  but initially I have my textboxes on a panel so none of my textboxes cleared as expected so I added   this panel1 Controls          Which got me to thinking that is you have lots of textboxes for different functions and only some need to be cleared out  perhaps using the multiple panel hierarchies you can target just a few and not all      foreach   TextBox tb in this Controls OfType lt TextBox gt

User · Answer

simple using linq  change as you see fit for whatever control your dealing with           private void DisableButtons                 foreach  var ctl in Controls OfType lt Button gt                           ctl Enabled   false                       private void EnableButtons                 foreach  var ctl in Controls OfType lt Button gt                           ctl Enabled   true

User · Answer

Even better  you can encapsule this to clear any type of controls you want in one method  like this   public static void EstadoControles lt T gt  object control  bool estado  bool limpiar   false  where T   Control                       foreach  var textEdits in   T control  Controls OfType lt TextEdit gt     textEdits Enabled   estado              foreach  var textLookUpEdits in   T control  Controls OfType lt LookUpEdit gt     textLookUpEdits Enabled   estado               if   limpiar  return                                foreach  var textEdits in   T control  Controls OfType lt TextEdit gt     textEdits Text   string Empty                  foreach  var textLookUpEdits in   T control  Controls OfType lt LookUpEdit gt     textLookUpEdits EditValue     -1

User · Answer

A lot of the above work   Just to add  If your textboxes are not directly on the form but are on other container objects like a GroupBox  you will have to get the GroupBox object and then iterate through the GroupBox to access the textboxes contained therein    foreach Control t in this Controls OfType lt GroupBox gt          foreach  Control tt in t Controls OfType lt TextBox gt                     do stuff

[c#] Foreach Control in form, how can I do something to all the TextBoxes in my Form?

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