OptionsCollection
sealed class OptionsCollection : IHtmlOptionsCollection, IHtmlCollection<IHtmlOptionElement>, IEnumerable<IHtmlOptionElement>, IEnumerable
A collection specialized on IHtmlOptionElement elements.
using AngleSharp.Dom.Html;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
namespace AngleSharp.Dom.Collections
{
internal sealed class OptionsCollection : IHtmlOptionsCollection, IHtmlCollection<IHtmlOptionElement>, IEnumerable<IHtmlOptionElement>, IEnumerable
{
private readonly IElement _parent;
private readonly IEnumerable<IHtmlOptionElement> _options;
public IHtmlOptionElement this[int index] {
get {
return GetOptionAt(index);
}
}
public IHtmlOptionElement this[string name] {
get {
if (string.IsNullOrEmpty(name))
return null;
foreach (IHtmlOptionElement option in _options) {
if (option.Id == name)
return option;
}
return _parent.Children[name] as IHtmlOptionElement;
}
}
public int SelectedIndex {
get {
int num = 0;
foreach (IHtmlOptionElement option in _options) {
if (option.IsSelected)
return num;
num++;
}
return -1;
}
set {
int num = 0;
foreach (IHtmlOptionElement option in _options) {
option.IsSelected = (num++ == value);
}
}
}
public int Length => _options.Count();
public OptionsCollection(IElement parent)
{
_parent = parent;
_options = GetOptions();
}
public IHtmlOptionElement GetOptionAt(int index)
{
if (index < 0)
return null;
return _options.Skip(index).FirstOrDefault();
}
public void SetOptionAt(int index, IHtmlOptionElement value)
{
IHtmlOptionElement optionAt = GetOptionAt(index);
if (optionAt != null)
_parent.ReplaceChild(value, optionAt);
else
_parent.AppendChild(value);
}
public void Add(IHtmlOptionElement element, IHtmlElement before = null)
{
_parent.InsertBefore(element, before);
}
public void Add(IHtmlOptionsGroupElement element, IHtmlElement before = null)
{
_parent.InsertBefore(element, before);
}
public void Remove(int index)
{
IHtmlOptionElement optionAt = GetOptionAt(index);
if (optionAt != null)
_parent.RemoveChild(optionAt);
}
private IEnumerable<IHtmlOptionElement> GetOptions()
{
foreach (INode childNode in _parent.ChildNodes) {
IHtmlOptionsGroupElement optgroup = childNode as IHtmlOptionsGroupElement;
if (optgroup != null) {
foreach (INode childNode2 in optgroup.ChildNodes) {
IHtmlOptionElement option = childNode2 as IHtmlOptionElement;
if (option != null)
yield return option;
}
} else if (childNode is IHtmlOptionElement) {
yield return (IHtmlOptionElement)childNode;
}
}
}
public IEnumerator<IHtmlOptionElement> GetEnumerator()
{
return _options.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
}