Hello How can I get a html content like a shoutbox or just the username of user connected in C# ?
Example: <p><?php echo USER['name'] ?></p>
in C#: How can I get the p value ?
You should be using an html parser like htmlagilitypack .Regex is not a good choice for parsing HTML files as HTML is not strict nor is it regular with its format.
You can use below code to retrieve it using HtmlAgilityPack
`
HtmlDocument doc = new HtmlDocument();
doc.Load(yourStream);
var itemList = doc.DocumentNode.SelectNodes("//p")//this xpath selects all p tags
.Select(p => p.InnerText)
.ToList();
`
Give the P element an ID, and reference it by:
string contents = yourId.Text;
with your html like this:
<p id="yourId"></p>
Related
What I need to do : Extract (Information of From, To, Cc and Subject ) and remove them from HTML file. Without the use of any 3rd party ( HTMLAgilityPack, etc)
What I am having trouble with: What will be my approach to get the following(from,to,subject,cc) from the html tags?
Steps I tried: I tried to get the index of <p class=MsoNormal> and the last index of the email #sampleemail.com but I think that is a bad approach since in some html files there will be a lot of
"<p class=MsNormal>" , regarding the removal of the from,to,cc and subject I just used the string.Remove(indexOf, i counted the characters from indexOf to lastIndexOf) function and it worked
Sample tag containing information of from:
<p class=MsoNormal style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:120.0pt;mso-layout-grid align:none;text-autospace:none'><b><span style='color:black'>From:<span style='mso-tab-count:1'></span></span></b><span style='color:black'>1234#sampleemail.com<o:p></o:p></span></p>
HTML FILE output:
HTMLAgilityPack is your friend. Simply using XPath like //p[#class ='MsoNormal'] to get tags content in HTML
public static void Main()
{
var html =
#"<p class=MsoNormal style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:120.0pt;mso-layout-grid align:none;text-autospace:none'><b><span style='color:black'>From:<span style='mso-tab-count:1'></span></span></b><span style='color:black'>1234#sampleemail.com<o:p></o:p></span></p> ";
var htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml(html);
var nodes = htmlDoc.DocumentNode.SelectNodes("//p[#class ='MsoNormal']");
foreach(var node in nodes)
Console.WriteLine(node.InnerText);
}
Result:
From:1234#sampleemail.com
Update
We may use Regex to write this simple parser. But remember that it cannot clear all cases for complicated html document.
public static void MainFunc()
{
string str = #"<p class='MsoNormal' style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:120.0pt;mso-layout-grid align:none;text-autospace:none'><b><span style='color:black'>From:<span style='mso-tab-count:1'></span></span></b><span style='color:black'>1234#sampleemail.com<o:p></o:p></span></p> ";
var result = Regex.Replace(str, "<(?:\"[^\"]*\"['\"]*|'[^']*'['\"]*|[^'\">])+>", "");
Console.WriteLine(result);
}
I'd like to scrape a table within a comment using HTMLAgilityPack. For example, on the page
http://www.baseball-reference.com/register/team.cgi?id=f72457e4
there is a table with id="team_pitching". I can get this comment as a block of text with:
var tags = doc.DocumentNode.SelectSingleNode("//comment()[contains(., 'team_pitching')]");
however my preference would be to select the rows from the table with something like:
var tags = doc.DocumentNode.SelectNodes("//comment()[contains(., 'team_pitching')]//table//tbody//tr");
or
var tags = doc.DocumentNode.SelectNodes("//comment()//table[#id = 'team_pitching']//tbody//tr");
but these both return null. Is there a way to do this so I don't have to parse the text manually to get all of the table data?
Sample HTML - I'm looking to find nodes inside <!-- ... -->:
<p>not interesting HTML here</p>
<!-- <table id=team_pitching>
<tbody><tr>...</tr>...</tbody>...</table> -->
Content of comment is not parsed as DOM nodes, so you can't search outside comment and inside comment with single XPath.
You can get InnerHTML of the comment node, trim comment tags, load it into the HtmlDocument and query on it. Something like this should work
var commentNode = doc.DocumentNode
.SelectSingleNode("//comment()[contains(., 'team_pitching')]");
var commentHtml = commentNode.InnerHtml.TrimStart('<', '!', '-').TrimEnd('-', '>');
var commentDoc = new HtmlDocument();
commentDoc.LoadHtml(commentHtml);
var tags = commentDoc.DocumentNode.SelectNodes("//table//tbody//tr");
How can I get List() from this text:
For the iPhone do the following:<ul><li>Go to AppStore</li><li>Search by him</li><li>Download</li></ul>
that should consist :Go to AppStore,
Search by him,
Download
Load the string up into the HTML Agility Pack then select all li elements inner text.
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml("following:<ul><li>Go to AppStore</li><li>Search by him</li><li>Download</li></ul>");
var uls = doc.DocumentNode.Descendants("li").Select(d => d.InnerText);
foreach (var ul in uls)
{
Console.WriteLine(ul);
}
Wrap in an XML root element and use LINQ to XML:
var xml = "For the iPhone do the following:<ul><li>Go to AppStore</li><li>Search by him</li><li>Download</li></ul>";
xml = "<r>"+xml+"</r>";
var ele = XElement.Parse(xml);
var lists = ele.Descendants("li").Select(e => e.Value).ToList();
Returns in lists:
Go to AppStore
Search by him
Download
So I have an HTML snippet that I want to modify using C#.
<div>
This is a specialSearchWord that I want to link to
<img src="anImage.jpg" />
A hyperlink
Some more text and that specialSearchWord again.
</div>
and I want to transform it to this:
<div>
This is a <a class="special" href="http://mysite.com/search/specialSearchWord">specialSearchWord</a> that I want to link to
<img src="anImage.jpg" />
A hyperlink
Some more text and that <a class="special" href="http://mysite.com/search/specialSearchWord">specialSearchWord</a> again.
</div>
I'm going to use HTML Agility Pack based on the many recommendations here, but I don't know where I'm going. In particular,
How do I load a partial snippet as a string, instead of a full HTML document?
How do edit?
How do I then return the text string of the edited object?
The same as a full HTML document. It doesn't matter.
The are 2 options: you may edit InnerHtml property directly (or Text on text nodes) or modifying the dom tree by using e.g. AppendChild, PrependChild etc.
You may use HtmlDocument.DocumentNode.OuterHtml property or use HtmlDocument.Save method (personally I prefer the second option).
As to parsing, I select the text nodes which contain the search term inside your div, and then just use string.Replace method to replace it:
var doc = new HtmlDocument();
doc.LoadHtml(html);
var textNodes = doc.DocumentNode.SelectNodes("/div/text()[contains(.,'specialSearchWord')]");
if (textNodes != null)
foreach (HtmlTextNode node in textNodes)
node.Text = node.Text.Replace("specialSearchWord", "<a class='special' href='http://mysite.com/search/specialSearchWord'>specialSearchWord</a>");
And saving the result to a string:
string result = null;
using (StringWriter writer = new StringWriter())
{
doc.Save(writer);
result = writer.ToString();
}
Answers:
There may be a way to do this but I don't know how. I suggest
loading the entire document.
Use a combination of XPath and regular
expressions
See the code below for a contrived example. You may have
other constraints not mentioned but this code sample should get you
started.
Note that your Xpath expression may need to be more complex to find the div that you want.
HtmlDocument doc = new HtmlDocument();
doc.Load(yourHtmlFile);
HtmlNode divNode = doc.DocumentNode.SelectSingleNode("//div[2]");
string newDiv = Regex.Replace(divNode.InnerHtml, #"specialSearchWord",
"<a class='special' href='http://etc'>specialSearchWord</a>");
divNode.InnerHtml = newDiv;
Console.WriteLine(doc.DocumentNode.OuterHtml);
How can I select every paragraph in a div tag for example.
<div id="body_text">
<p>Hi</p>
<p>Help Me Please</P>
<p>Thankyou</P>
I have got Html Agility downloaded and referenced in my program, All I need is the paragraphs. There may be a variable number of paragraphs and there are loads of different div tags but I only need the content within the body_text. Then I assume this can be stored as a string which I then want to write to a .txt file for later reference. Thankyou.
The valid XPATH for your case is //div[#id='body_text']/p
foreach(HtmlNode node in yourHTMLAgilityPackDocument.DocumentNode.SelectNodes("//div[#id='body_text']/p")
{
string text = node.InnerText; //that's the text you are looking for
}
Here's a solution that grabs the paragraphs as an enumeration of HtmlNodes:
HtmlDocument doc = new HtmlDocument();
doc.Load("your.html");
var div = doc.GetElementbyId("body_text");
var paragraphs = div.ChildNodes.Where(item => item.Name == "p");
Without explicit Linq:
var paragraphs = doc.GetElementbyId("body_text").Elements("p");