/// <summary>
/// 将文档中所有的uri属性转换为绝对的uri。
/// </summary>
/// <param name="document">要执行转换的文档</param>
/// <param name="resolveInternalReference">是否转换页内 uri</param>
public static void ResolveUriToAbsoluate(this IHtmlDocument document, bool resolveInternalReference)
{
if (document == null)
{
throw new ArgumentNullException("document");
}
var baseUri = document.DocumentUri;
if (baseUri == null)
{
throw new InvalidOperationException();
}
foreach (var attribute in document.AllElements().SelectMany(e => e.Attributes()).Where(a => document.HtmlSpecification.IsUriValue(a)).ToArray())
{
var value = attribute.Value();
if (string.IsNullOrEmpty(value))
{
continue;
}
Uri uri;
if (!Uri.TryCreate(baseUri, value, out uri))
{
continue;
}
if (uri.Equals(baseUri) && !resolveInternalReference)
{
continue;
}
attribute.Element.SetAttribute(attribute.Name, uri.AbsoluteUri);
}
}