C＃HtmlAgilityPack Xpath问题，找不到H4内在文字 [英] C# HtmlAgilityPack Xpath problems, trouble finding H4 innertext
问题描述
我有一种方法可以在网页的一部分中找到我正在寻找的所有东西，除非我试图在节点内找到一个H4。 // div [@ class ='job']的xpath正确找到我正在寻找的所有8个事件。但是，在我尝试浏览8次发生之后，我遇到了问题。
这是我正在看的代码的HTML输出。
< div class =job_art>
< div style =background：＃444 url（'https://a.akamaihd.net/mwfb/mwfb/graphics/jobs/chicago/meet_with_the_south_gang_family_ 760x225_01.jpg'）50％0不重复; >
< / div>
< / div>
< div class =job_details clearfix>
< h4>与南方家族会面< / h4>
< div class =mastery_bartitle =表示你已经掌握了多少这个工作，掌握了工作获得技能点>< div style =width：0％ class =noHighlight>< / div>< p> 100％掌握< / p>< div style =width：0％>< p> 100％Mastered< / p>< / div>< / div>< ul class =使用clearfixstyle =width：100px;>< li class =energybase_value =2current_value =2title = > 2< / li>< / ul>< ul class =支付clearfixstyle =width：120pxtitle =在做Jobs时获得XP，City Cash和Loot项目。 >< li class =experiencebase_value =2current_value =2> 2< / li>< li class =cash_icon_jobs_8base_value =2current_value =2> / li>< / ul>< a id ='btn_dojob_1'class ='sexy_button_new sexy_energy_new medium orange impulse_buy'selector ='＃inner_page'requirements ='{energy：2}'precall ='BrazilJobs.preDoJob' ='BrazilJobs .doJob'href ='remote / h.php？job = 1& tab = 1& clkdiv = btn_dojob_1'>< span>< span> Do Job< / span>< / span>< / a> < / div>< div class =job_additional_results>< div id =loot-bandit-1class =lootContainer>< / div>< div class =previous_loot>< ; / div>< / div>< div id =bandit-contextual-1class =contextual bandit-contextual>< / div>
它总是会找到像Clams（Bank）这样的东西，我不知道如何。问题始于
string MissionName = node.SelectSingleNode（// h4）。InnerText;我已尝试过许多xpath，像// div [h4 [1]]，h4 [1] 。我只需要第一次发生，因为它只发生一次。我的代码中出现了什么问题？
我需要内部文本与南方家人见面
public static List< string> GetMissions（）
{
列表< string> FoundMissions = new List< string>（）;
HTML_CONTENT = HTML_CONTENT.Replace（\r，）;
HTML_CONTENT = HTML_CONTENT.Replace（\t，）;
HTML_CONTENT = HTML_CONTENT.Replace（\\\
，）;
HTML_CONTENT = HTML_CONTENT.Replace（\\，）;
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument（）;
doc.Load（new StringReader（HTML_CONTENT））;
if（doc.DocumentNode == null）
return FoundMissions;
var DivNodes = doc.DocumentNode.SelectNodes（// div [@ class ='job']）;
if（DivNodes！= null）
{
string Count = DivNodes.Count.ToString（）;
像我说的一样，它发现所有8次发生都很好。我调试并得到上面的HTML，我放在这个顶部，所以我认为这个部分是好的。
foreach（HtmlNode节点在DivNodes中）
{
string MissionName = node.SelectSingleNode（// h4）。InnerText;
}
}
return FoundMissions;
}
}
解决方案您需要通过添加单点（。节点相关$ c>）开始：
string MissionName = node.SelectSingleNode（.// h4）。InnerText;
否则，XPath将从根节点搜索。这可能是因为您的尝试导致您的结果不正确。
I have a method that will find everything I am looking for in a section of a webpage, except I am getting stuck trying to find an H4 within nodes. The xpath for //div[@class='job '] correctly finds all 8 occurances that I am looking for. But after I try and traverse the 8 occurances I hit problems.
Here is the HTML output of the code I am looking inside.
<div class="job_art ">
<div style="background: #444 url('https://a.akamaihd.net/mwfb/mwfb/graphics/jobs/chicago/meet_with_the_south_gang_family_ 760x225_01.jpg') 50% 0 no-repeat;">
</div>
</div>
<div class="job_details clearfix">
<h4>Meet With the South Gang Family</h4>
<div class="mastery_bar" title="Indicates how much of this Job you've mastered. Master Jobs to earn Skill Points."><div style="width: 0%" class="noHighlight"></div><p>100% Mastered</p><div style="width: 0%"><p>100% Mastered</p></div></div><ul class="uses clearfix" style="width:100px;"><li class="energy" base_value="2" current_value="2" title="Spend 2 Energy to do this Job once.">2</li></ul><ul class="pays clearfix" style="width:120px" title="Earn XP, City Cash and Loot items while doing Jobs."><li class="experience" base_value="2" current_value="2">2</li><li class="cash_icon_jobs_8" base_value="2" current_value="2">2</li></ul><a id='btn_dojob_1' class='sexy_button_new sexy_energy_new medium orange impulse_buy' selector='#inner_page' requirements='{"energy":2}' precall='BrazilJobs.preDoJob' callback='BrazilJobs.doJob' href='remote/h.php?job=1&tab=1&clkdiv=btn_dojob_1'><span><span>Do Job</span></span></a></div><div class="job_additional_results"><div id="loot-bandit-1" class="lootContainer"></div><div class="previous_loot"></div></div><div id="bandit-contextual-1" class="contextual bandit-contextual"></div>
It always finds something else like "Clams(Bank)", which I have no idea how. The problem starts with
string MissionName = node.SelectSingleNode("//h4").InnerText;
I have tried numerous xpath, like //div[h4[1]], h4[1]. I only need the first occurence since it only occurs once. Where does the problem start in my code?
I need the inner text "Meet With the South Gang Family"
public static List<string> GetMissions()
{
List<string> FoundMissions = new List<string>();
HTML_CONTENT = HTML_CONTENT.Replace("\r", "");
HTML_CONTENT = HTML_CONTENT.Replace("\t", "");
HTML_CONTENT = HTML_CONTENT.Replace("\n", "");
HTML_CONTENT = HTML_CONTENT.Replace("\\", "");
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.Load(new StringReader(HTML_CONTENT));
if(doc.DocumentNode == null)
return FoundMissions;
var DivNodes = doc.DocumentNode.SelectNodes("//div[@class='job ']");
if (DivNodes != null)
{
string Count = DivNodes.Count.ToString();
Like I said, it finds all 8 occurances fine. I debugged and got the above HTML i put at the top of this, so I think this part is fine.
foreach (HtmlNode node in DivNodes)
{
string MissionName = node.SelectSingleNode("//h4").InnerText;
}
}
return FoundMissions;
}
}
解决方案 You need to explicitly tell that the XPath query is relative to current node by adding single dot (.) at the beginning :
string MissionName = node.SelectSingleNode(".//h4").InnerText;
otherwise, the XPath will search from root node. That's likely what cause you got incorrect result with your attempt.
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