Using Regex and Yield to Recursively Find Multiple Controls
This is a simple extension method that finds all child controls whose ID matches the regex pattern.
The Code
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| using System.Collections.Generic; | |
| using System.Text.RegularExpressions; | |
| using System.Web.UI; | |
| public static class ControlHelpers | |
| { | |
| public static IEnumerable<Control> FindControlsRecursive(this Control root, string regex) | |
| { | |
| foreach (Control child in root.Controls) | |
| { | |
| if (!string.IsNullOrWhiteSpace(child.ID)) | |
| { | |
| if (Regex.Match(child.ID, regex).Success) | |
| { | |
| yield return child; | |
| } | |
| } | |
| if (child.Controls.Count > 0) | |
| { | |
| foreach (Control c in FindControlsRecursive(child, regex)) | |
| { | |
| yield return c; | |
| } | |
| } | |
| } | |
| } | |
| } |
Demonstration
foreach (Control control in pnlExample.FindControlsRecursive(@"[^QuestionID]"))
{
// do something
}