// https://stackoverflow.com/a/3742207/4134376
/// <summary>
/// Appends the <c>CSS</c> classes passed as parameters to the already existing ones in the control <see cref="WebControl.Attributes" /> collection.
/// If there is no attribute named <c>"class"</c> in the collection, one will be added.
/// </summary>
/// <param name="webControl">The type the method operates on</param>
/// <param name="classNameParams">The class name to add</param>
public static void AddClass(this WebControl webControl, params string[] classNameParams)
{
IEnumerable <string> classEnumerable = classNameParams;
if (webControl.Attributes["class"] != null)
{
classEnumerable = webControl.GetClassesExcept(classNameParams).Concat(classNameParams);
}
webControl.Attributes.Add("class", String.Join(" ", classEnumerable.ToArray()));
}
///// <summary>
///// Replaces the <c>CSS</c> classes of the attribute <c>"class"</c> defined in the control <see cref="WebControl.Attributes" /> collection.
///// If there is no attribute named <c>"class"</c> in the collection, one will be added.
///// </summary>
///// <param name="webControl">The type the method operates on</param>
///// <param name="classNameParams">The class name to add</param>
//public static void Class(this WebControl webControl, params string[] classNameParams) {
// webControl.Attributes.Add("class", String.Join(" ", classNameParams));
//}
///// <summary>
///// Replaces the control <see cref="WebControl.CssClass" /> property <c>CSS</c> classes with the passed as parameters.
///// </summary>
///// <param name="webControl">The type the method operates on</param>
///// <param name="classNameParams">The class name to add</param>
//public static void CssClass(this WebControl webControl, params string[] classNameParams) {
// webControl.CssClass = String.Join(" ", classNameParams);
//}
/// <summary>
/// Remove the <c>CSS</c> classes of the attribute <c>"class"</c> defined in the control <see cref="WebControl.Attributes" /> collection, that match the names passed as parameters.
/// If the attribute <c>"class"</c> in the collection has no <c>CSS</c> classes it will be removed from the control.
/// </summary>
/// <param name="webControl">The type the method operates on</param>
/// <param name="classNameParams">The class name to remove</param>
public static void RemoveClass(this WebControl webControl, params string[] classNameParams)
{
IEnumerable <string> classEnumerable = classNameParams;
if (webControl.Attributes["class"] != null)
{
classEnumerable = webControl.GetClassesExcept(classNameParams);
}
string[] classNames = classEnumerable.ToArray();
if (classNames.Length > 0)
{
webControl.Attributes.Add("class", String.Join(" ", classNames));
}
else
{
webControl.Attributes.Remove("class");
}
}