/// <summary>
/// 获取元素相对于文档根的路径表达
/// </summary>
/// <param name="element">要获取路径的元素</param>
/// <returns>路径表达式</returns>
public static string PathOf(this IHtmlElement element)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
element.EnsureAllocated();
return(PathOf(element, element.Document));
}
/// <summary>
/// 获取元素相对于指定元素的路径表达
/// </summary>
/// <param name="element">要获取路径的文档</param>
/// <param name="ancestor">计算路径的起始对象</param>
/// <returns>路径表达式</returns>
public static string PathOf(this IHtmlElement element, IHtmlContainer ancestor)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (ancestor == null)
{
throw new ArgumentNullException("ancestor");
}
element.EnsureAllocated();
StringBuilder builder = new StringBuilder();
while (true)
{
builder.Insert(0, "/" + element.Name);
var container = element.Container;
if (container.Equals(ancestor))
{
return(builder.ToString());
}
element = container as IHtmlElement;
if (element == null)
{
return(null);
}
}
}
