/// <summary>
/// 解析下一个链接
/// </summary>
/// <returns></returns>
protected override string ParseNextUrl()
{
if (this.IsEmptyPage())
{
return(null);
}
var currentUrl = this.CurrentUrl;
if (StringExtension.IsNullOrWhiteSpace(currentUrl))
{
return(null);
}
var nextpageUrl = HtmlDocumentHelper.GetValueByXPath(this.HtmlSource, @"//a[text()='下一页']/@href");
if (StringExtension.IsNullOrWhiteSpace(nextpageUrl))
{
return(null);
}
string baseUrl;
NameValueCollection collection;
Url.ParseUrl(currentUrl, out baseUrl, out collection);
var pageNo = int.Parse(collection[@"pageNo"]);
collection["@pageNo"] = $"{pageNo + 1}";
return(Url.CombinUrl(baseUrl, collection));
}