本文整理汇总了C#中HtmlAgilityPack.HtmlNode.NullCheck方法的典型用法代码示例。如果您正苦于以下问题：C# HtmlNode.NullCheck方法的具体用法？C# HtmlNode.NullCheck怎么用？C# HtmlNode.NullCheck使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类HtmlAgilityPack.HtmlNode的用法示例。
在下文中一共展示了HtmlNode.NullCheck方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: ScrapeUserData
private User ScrapeUserData(HtmlNode node, User user)
{
node.NullCheck();
user = user ?? new User();
/// name
HtmlNode nameNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageName);
if (nameNode != null && nameNode.NextSibling != null)
{
user.Name = nameNode.NextSibling.InnerText.SafeTrim();
}
/// email
HtmlNode emailNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageEmail);
if (emailNode != null && emailNode.NextSibling != null && emailNode.NextSibling.NextSibling != null)
{
user.Email = emailNode.NextSibling.NextSibling.InnerText.SafeTrim();
}
/// gender
HtmlNode genderNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageGender);
if (genderNode != null && genderNode.NextSibling != null)
{
string genderString = genderNode.NextSibling.InnerText.SafeTrim();
if (genderString == ParsingHelper.GenderMale)
{
user.Gender = UserGenderEnum.Male;
}
else if (genderString == ParsingHelper.GenderFemale)
{
user.Gender = UserGenderEnum.Female;
}
else
{
user.Gender = UserGenderEnum.NotSet;
this._logger.DebugFormat("ScrapeUserData, Gender not set - STRING: {0}", genderString);
}
}
/// birthdate
HtmlNode birthdateNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageBirthDate);
if (birthdateNode != null && birthdateNode.NextSibling != null)
{
DateTime birthdate;
if (birthdateNode.NextSibling.InnerText.TryParseLogging(out birthdate))
{
user.Birthdate = birthdate;
}
}
Regex digitsRegex = new Regex(@"(?<digits>\d+)");
/// forum posts
HtmlNode forumPostsNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageForumPosts);
if (forumPostsNode != null && forumPostsNode.NextSibling != null)
{
Match match = digitsRegex.Match(forumPostsNode.NextSibling.InnerText);
if (match.Success)
{
user.ForumPosts = int.Parse(match.Groups["digits"].Value);
}
}
/// blog posts
HtmlNode blogPostsNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageBlogPosts);
if (blogPostsNode != null && blogPostsNode.NextSibling != null)
{
Match match = digitsRegex.Match(blogPostsNode.NextSibling.InnerText);
if (match.Success)
{
user.BlogPosts = int.Parse(match.Groups["digits"].Value);
}
}
/// picture posts
HtmlNode picturePostsNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPagePicturePosts);
if (picturePostsNode != null && picturePostsNode.NextSibling != null)
{
Match match = digitsRegex.Match(picturePostsNode.NextSibling.InnerText);
if (match.Success)
{
user.PublishedPictures = int.Parse(match.Groups["digits"].Value);
}
}
/// comment posts
HtmlNode commentPostsNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageCommentPosts);
if (commentPostsNode != null && commentPostsNode.NextSibling != null)
{
Match match = digitsRegex.Match(commentPostsNode.NextSibling.InnerText);
if (match.Success)
{
user.PublishedComments = int.Parse(match.Groups["digits"].Value);
}
}
/// video posts
HtmlNode videoPostsNode = node.ChildNodes.FirstOrDefault(x => x.InnerText == ParsingHelper.UserPageVideoPosts);
if (videoPostsNode != null && videoPostsNode.NextSibling != null)
{
//.........这里部分代码省略.........
示例2: ScrapeComment
private Comment ScrapeComment(HtmlNode commentNode)
{
Comment comment = new Comment()
{
AccessedDate = DateTime.UtcNow.ToUniversalTime(),
};
commentNode.NullCheck();
HtmlNode headerNode = commentNode.SelectSingleNode(CommentsPageXPath.HeaderInfo);
IList<HtmlNode> innerHeaderNodes = headerNode.ChildNodes.Where(x => x.Name == "a").ToList();
/// userUrl, url, username, id
if (innerHeaderNodes != null && innerHeaderNodes.Count == 2)
{
if (innerHeaderNodes[0].Attributes["href"] != null)
{
comment.UserUrl = innerHeaderNodes[0].Attributes["href"].Value.SafeTrim().ToFullRtvSloUrl();
comment.UserId = this.GetIdStringFromUrl(comment.UserUrl);
}
else
{
this._logger.ErrorFormat("ScrapingService, ScrapeComment - User url is null - NODE: {0}", commentNode.SerializeHtmlNode());
}
comment.UserName = innerHeaderNodes[0].InnerText.SafeTrim();
if (innerHeaderNodes[1].Attributes["href"] != null)
{
comment.Url = innerHeaderNodes[1].Attributes["href"].Value.SafeTrim().ToFullRtvSloUrl();
comment.Id = this.GetIdFromUrl(comment.Url);
}
else
{
this._logger.ErrorFormat("ScrapingService, ScrapeComment - Comment url is null - NODE: {0}", commentNode.SerializeHtmlNode());
}
}
/// created date time
string dateCreatedString = headerNode.LastChild.InnerText.SafeTrim();
DateTime created;
if (dateCreatedString.TryParseExactLogging(ParsingHelper.ShortDateTimeParseExactPattern, this.cultureInfo, DateTimeStyles.None, out created))
{
comment.DateCreated = created.ToUniversalTime();
}
HtmlNode contentNode = commentNode.SelectSingleNode(CommentsPageXPath.Content);
if (contentNode != null)
{
string content = contentNode.InnerText.SafeTrimAndEscapeHtml();
comment.Content = content;
}
else
{
this._logger.ErrorFormat("ScrapingService, ScrapeComment - Comment content is null - URL: {0}", comment.Url);
}
/// rating
HtmlNode ratingNode = commentNode.SelectSingleNode(CommentsPageXPath.Rating);
string plusRatingString = ratingNode.SelectSingleNode(CommentsPageXPath.PlusRating).InnerText.SafeTrim();
string minusRatingString = ratingNode.SelectSingleNode(CommentsPageXPath.MinusRating).InnerText.SafeTrim();
int plusRating = this.ScrapeCommentRating(plusRatingString, comment.Url);
int minusRating = this.ScrapeCommentRating(minusRatingString, comment.Url);
comment.Rating = plusRating + minusRating;
return comment;
}示例3: ScrapePost
private Post ScrapePost(HtmlNode contentNode, Post post)
{
post = post ?? new Post();
contentNode.NullCheck();
/// title
HtmlNode titleNode = contentNode.SelectSingleNode(PostPageXPath.Title);
if (titleNode != null)
{
post.Title = titleNode.InnerText.SafeTrimAndEscapeHtml();
}
else
{
this._logger.ErrorFormat("ScrapingService, ScrapePost, Title node is null - URL: {0}, NODE: {1}", post.Url, contentNode.SerializeHtmlNode());
}
/// subtitle
HtmlNode subtitleNode = contentNode.SelectSingleNode(PostPageXPath.Subtitle);
if (subtitleNode != null)
{
post.Subtitle = subtitleNode.InnerText.SafeTrimAndEscapeHtml();
}
else
{
this._logger.ErrorFormat("ScrapingService, ScrapePost, Subtitle node is null - URL: {0}, NODE: {1}", post.Url, contentNode.SerializeHtmlNode());
}
/// author
HtmlNode authorNode = contentNode.SelectSingleNode(PostPageXPath.Auhtor);
if (authorNode != null)
{
IList<HtmlNode> authorNameNodes = authorNode.ChildNodes.Where(x => x.Name == "b" && x.ChildNodes.Where(t => t.Name == "a").Count() == 0).ToList();
if (!authorNameNodes.IsEmpty())
{
foreach (HtmlNode author in authorNameNodes)
{
//TODO http://www.rtvslo.si/mmc-priporoca/dame-niso-sposobne-zmagati-na-dirki-formule-ena/306771
User authorUser = new User()
{
Name = author.InnerText.SafeTrim().Replace(",", string.Empty).Replace("foto:", string.Empty).SafeTrimAndEscapeHtml(),
Function = UserFunctionEnum.Journalist
};
post.Authors.Add(authorUser);
}
}
//HtmlNode authorName = authorNode.ChildNodes.FindFirst("b");
//if (authorName != null)
//{
// post.Authors = authorName.InnerText.SafeTrimAndEscapeHtml();
//}
}
if (post.Authors.IsEmpty())
{
//this._logger.WarnFormat("ScrapingService, ScrapePost, Author is empty - URL: {0}, NODE: {1}", post.Url, contentNode.SerializeHtmlNode());
this._logger.WarnFormat("ScrapingService, ScrapePost, Author is empty - URL: {0}", post.Url);
}
/// info
HtmlNode infoNode = contentNode.SelectSingleNode(PostPageXPath.InfoContent);
if (infoNode != null)
{
// <div class="info">16. februar 2013 ob 07:22,<br>zadnji poseg: 16. februar 2013 ob 15:16<br>Schladming - MMC RTV SLO</div>
IList<HtmlNode> textNodes = infoNode.ChildNodes.Where(x => x.Name == "#text").ToList();
if (textNodes != null && textNodes.Count > 1)
{
/// Created datetime
string createdDateTimeString = textNodes.First().InnerText.SafeTrim();
DateTime createdDate;
if (createdDateTimeString.TryParseExactLogging(ParsingHelper.LongDateTimeParseExactPattern, this.cultureInfo, DateTimeStyles.None, out createdDate))
{
post.DateCreated = createdDate.ToUniversalTime();
post.LastUpdated = createdDate.ToUniversalTime();
}
/// Location
string locationString = textNodes.Last().InnerText;
IList<string> locationList = locationString.Split(new string[]{"-"}, StringSplitOptions.RemoveEmptyEntries).ToList();
if (locationList != null && locationList.Count > 1)
{
post.Location = locationList.First().SafeTrim();
if (locationList.Last().SafeTrim() != "MMC RTV SLO")
{
this._logger.DebugFormat("ScrapingService, ScrapePost, InfoNode, Location - URL: {0}, LIST: {1}", post.Url, locationList.SerializeObject());
}
}
else
{
this._logger.WarnFormat("ScrapingService, ScrapePost, InfoNode, Location - URL: {0}, NODE: {1}", post.Url, infoNode.SerializeHtmlNode());
}
if (textNodes.Count == 3)
{
/// Updated datetime
//.........这里部分代码省略.........
示例4: ScrapeUserRating
private User ScrapeUserRating(HtmlNode node, User user)
{
/// <div id="rate_text" style="font-weight:normal;color:#000000;font:9px Arial;">Ocena <strong>4.5</strong> od <strong>642</strong> glasov</div>
node.NullCheck();
user = user ?? new User();
IList<HtmlNode> nodes = node.ChildNodes.Where(x => x.Name == "strong").ToList();
if (nodes.Count != 2)
{
throw new IndexOutOfRangeException();
}
decimal rating = -1;
int ratings = -1;
if (!string.IsNullOrEmpty(nodes[0].InnerHtml) && decimal.TryParse(nodes[0].InnerHtml, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out rating))
{
user.Rating = rating;
}
if (!string.IsNullOrEmpty(nodes[1].InnerHtml) && int.TryParse(nodes[1].InnerHtml, out ratings))
{
user.NumOfRatings = ratings;
}
return user;
}