[ExtensionMethods] System.Web.UI.WebControls.WebControl

These are extension methods for "System.Web.UI.WebControls.WebControl" class. Some are written by me and the rest are collected from other sources. Hope you find them useful :)

using System;
using System.Linq;
using System.Web.UI.WebControls;
using System.Collections.Generic;
 
namespace DevelopmentSimplyPut.ExtensionMethods.WebControlEM
{
 public static class WebControlExtensionMethods
 {
  /// <summary>
  /// Adds a CSS class to a WebControl
  /// </summary>
  /// <param name="control">The WebControl</param>
  /// <param name="cssClass">CSS class name</param>
  public static void ext_AddCssClass(this WebControl control, string cssClass)
  {
   if (null != control && !string.IsNullOrEmpty(cssClass) && !string.IsNullOrWhiteSpace(cssClass))
   {
    if (string.IsNullOrEmpty(control.CssClass) || string.IsNullOrWhiteSpace(control.CssClass))
    {
     control.CssClass = cssClass;
    }
    else
    {
     bool found = false;
     {
      found = control.CssClass.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
        .Any<string>(classEntry => classEntry.Trim().ToUpperInvariant().Equals(cssClass.Trim().ToUpperInvariant(), StringComparison.OrdinalIgnoreCase));
     }
 
     if (!found)
     {
      control.CssClass += " " + cssClass;
      control.CssClass.Trim();
     }
    }
   }
  }
  /// <summary>
  /// Removes a CSS class from a WebControl
  /// </summary>
  /// <param name="control">The WebControl</param>
  /// <param name="cssClass">CSS class name</param>
  public static void ext_RemoveCssClass(this WebControl control, string cssClass)
  {
   if (null != control && !string.IsNullOrEmpty(cssClass) && !string.IsNullOrWhiteSpace(cssClass) && !string.IsNullOrEmpty(control.CssClass) && !string.IsNullOrWhiteSpace(control.CssClass))
   {
    if (control.CssClass.Trim().ToUpperInvariant().Equals(cssClass.Trim().ToUpperInvariant()))
    {
     control.CssClass = string.Empty;
    }
    else
    {
     var classes = control.CssClass.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
          .SkipWhile<string>(classEntry => classEntry.Trim().ToUpperInvariant().Equals(cssClass.Trim().ToUpperInvariant(), StringComparison.OrdinalIgnoreCase))
          .ToArray<string>();
 
     if (null != classes && classes.Length > 0)
     {
      control.CssClass = String.Join(" ", classes);
      control.CssClass.Trim();
     }
    }
   }
  }
  /// <summary>
  /// Gets an IEnumerable of all child WebControls
  /// </summary>
  /// <param name="source">WebControl</param>
  /// <returns></returns>
  public static IEnumerable<WebControl> ext_GetChildControlsRecursively(this WebControl source)
  {
   return source.ext_GetChildControlsRecursively(null);
  }
  /// <summary>
  /// Gets an IEnumerable of all child WebControls which satisfy a certain condition
  /// </summary>
  /// <param name="source">WebControl</param>
  /// <param name="selector">Selector method which decides if a certain WebControl should be selected</param>
  /// <returns></returns>
  public static IEnumerable<WebControl> ext_GetChildControlsRecursively(this WebControl source, Func<WebControl,bool> selector)
  {
   if (null != source)
   {
    if ((null == selector) || (null != selector && selector(source)))
    {
     yield return source;
    }
 
    if (!source.HasControls())
    {
     yield break;
    }
 
    foreach (WebControl ctrl in source.Controls)
    {
     foreach (WebControl ctrl1 in ctrl.ext_GetChildControlsRecursively())
     {
      if ((null == selector) || (null != selector && selector(ctrl1)))
      {
       yield return ctrl1;
      }
     }
    }
   }
   else
   {
    yield break;
   }
  }
 }
}