Better way to find control in ASP NET

Question

I have a complex asp net form having even 50 to 60 fields in one form like there is Multiview  inside MultiView I have a GridView  and inside GridView I have several CheckBoxes   Currently I am using chaining of the FindControl   method and retrieving the child ID   Now  my question is that is there any other way solution to find the nested control in ASP NET

User · Answer

https   blog codinghorror com recursive-pagefindcontrol   Page FindControl  DataList1  ctl0 TextBox3      OR  private Control FindControlRecursive Control root  string id        if  root ID    id                return root            foreach  Control c in root Controls                Control t   FindControlRecursive c  id           if  t    null                        return t                      return null

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Action Management On Controls  Create below class in base class  Class To get all controls   public static class ControlExtensions       public static IEnumerable lt T gt  GetAllControlsOfType lt T gt  this Control parent  where T   Control               var result   new List lt T gt             foreach  Control control in parent Controls                        if  control is T                                result Add  T control                             if  control HasControls                                  result AddRange control GetAllControlsOfType lt T gt                                      return result            From Database  Get All Actions IDs  like divAction1 divAction2       dynamic in DATASET  DTActions  allow on specific User   In Aspx  in HTML Put Action button anchor etc  in div or span and give them id like    lt div id  divAction1  visible  false  runat  server  clientidmode  Static  gt                      lt a id  anchorAction  runat  server  gt Submit                          lt  a gt                                          lt  div gt    IN CS  Use this function on your page   private void ShowHideActions                  var controls   Page GetAllControlsOfType lt HtmlGenericControl gt              foreach  DataRow dr in DTActions Rows                                   foreach  Control cont in controls                                 if  cont ClientID     divAction    dr  ActionID   ToString                                          cont Visible   true

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I decided to just build controls dictionaries   Harder to maintain  might run faster than the recursive FindControl     protected void Page Load object sender  EventArgs e      this BuildControlDics       private void BuildControlDics        Divs   new Dictionary lt MyEnum  HtmlContainerControl gt        Divs Add MyEnum One  this divOne      Divs Add MyEnum Two  this divTwo      Divs Add MyEnum Three  this divThree        And before I get down-thumbs for not answering the OP s question     Q  Now  my question is that is there any other way solution to find the nested control in ASP NET  A  Yes  avoid the need to search for them in the first place   Why search for things you already know are there   Better to build a system allowing reference of known objects

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Late as usual  If anyone is still interested in this there are a number of related SO questions and answers  My version of recursive extension method for resolving this   public static IEnumerable lt T gt  FindControlsOfType lt T gt  this Control parent                                                          where T   Control       foreach  Control child in parent Controls                if  child is T                        yield return  T child                    else if  child Controls Count  gt  0                        foreach  T grandChild in child FindControlsOfType lt T gt                                   yield return grandChild

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The following example defines a Button1 Click event handler  When invoked  this handler uses the FindControl method to locate a control with an ID property of TextBox2 on the containing page  If the control is found  its parent is determined using the Parent property and the parent control s ID is written to the page  If TextBox2 is not found   Control Not Found  is written to the page   private void Button1 Click object sender  EventArgs MyEventArgs             Find control on page        Control myControl1   FindControl  TextBox2          if myControl1  null                      Get control s parent           Control myControl2   myControl1 Parent           Response Write  Parent of the text box is       myControl2 ID                 else                  Response Write  Control not found

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All the highlighted solutions are using recursion  which is performance costly   Here is cleaner way without recursion   public T GetControlByType lt T gt  Control root  Func lt T  bool gt  predicate   null  where T   Control        if  root    null            throw new ArgumentNullException  root               var stack   new Stack lt Control gt  new Control     root          while  stack Count  gt  0            var control   stack Pop            T match   control as T           if  match    null  amp  amp   predicate    null    predicate match                  return match                     foreach  Control childControl in control Controls               stack Push childControl                        return default T

User · Answer

If you re looking for a specific type of control you could use a recursive loop like this one -  http   weblogs asp net eporter archive 2007 02 24 asp-net-findcontrol-recursive-with-generics aspx  Here s an example I made that returns all controls of the given type       lt summary gt      Finds all controls of type T stores them in FoundControls      lt  summary gt       lt typeparam name  T  gt  lt  typeparam gt  private class ControlFinder lt T gt  where T   Control        private readonly List lt T gt   foundControls   new List lt T gt         public IEnumerable lt T gt  FoundControls               get   return  foundControls                   public void FindChildControlsRecursive Control control                foreach  Control childControl in control Controls                        if  childControl GetType      typeof T                                  foundControls Add  T childControl                             else                               FindChildControlsRecursive childControl

User · Answer

FindControl does not search within nested controls recursively  It does only find controls that s NamigContainer is the Control on that you are calling FindControl   Theres a reason that ASP Net does not look into your nested controls recursively by default    Performance Avoiding errors Reusability   Consider you want to encapsulate your GridViews  Formviews  UserControls etc  inside of other UserControls for reusability reasons  If you would have implemented all logic in your page and accessed these controls with recursive loops  it ll very difficult to refactor that  If you have implemented your logic and access methods via the event-handlers f e  RowDataBound of GridView   it ll be much simpler and less error-prone

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Recursively find all controls matching the specified predicate  do not include root Control        public static IEnumerable lt Control gt  FindControlsRecursive this Control control  Func lt Control  bool gt  predicate                var results   new List lt Control gt              foreach  Control child in control Controls                        if  predicate child                                 results Add child                             results AddRange child FindControlsRecursive predicate                       return results          Usage   myControl FindControlsRecursive c   gt  c ID     findThisID

[asp.net] Better way to find control in ASP.NET

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