/// <summary>
/// 获取所有父代元素
/// </summary>
/// <param name="node">要获取父代元素集合的节点</param>
/// <returns>节点的所有父代元素集合</returns>
public static IEnumerable <IHtmlElement> Ancestors(this IHtmlNode node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
EnsureAvaliable(node);
while (true)
{
var element = node.Parent();
if (element == null)
{
yield break;
}
yield return(element);
node = element;
}
}
/// <summary>
/// 获取指定节点或元素最近的数据上下文
/// </summary>
/// <returns>最近的数据上下文，将递归查找父级和父级上下文，如果都没找到则返回null</returns>
internal object GetDataContext(IHtmlNode node)
{
VerifyAccess();
object data = GetDataContextCore(node);
if (data != null)
{
return(data);
}
IHtmlElement container;
while ((container = node.Parent()) != null)
{
data = GetDataContextCore(container);
if (data != null)
{
return(data);
}
node = container;
}
return(null);
}
/// <summary>
/// 获取当前节点的文本模式
/// </summary>
/// <param name="node">要获取文本模式的节点</param>
/// <returns>节点当前适用的文本模式</returns>
public static TextMode ElementTextMode(this IHtmlNode node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
var specification = node.Document.HtmlSpecification;
var element = node as IHtmlElement ?? node.Parent();
if (element == null)
{
return(TextMode.Normal);
}
return(specification.ElementTextMode(element));
}
/// <summary>
/// 获取所有父代元素
/// </summary>
/// <param name="node">要获取父代元素集合的节点</param>
/// <returns>节点的所有父代元素集合</returns>
public static IEnumerable <IHtmlElement> Ancestors(this IHtmlNode node)
{
EnsureAvaliable(node);
while (true)
{
var element = node.Parent();
if (element == null)
{
yield break;
}
yield return(element);
node = element;
}
}