Certain website returning Null with HTML Agility Pack
So I'm trying to scrape a website and I'm using HTML Agility Pack to try and do this. I have tried my code on the html-agility-pack and google websites and it seem to work fine with this simple search.
My problem is the code is returning an error ("System.NullReferenceException: 'Object reference not set to an instance of an object.'") on this line of code:
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
I understand this is happening because the var node is returning Null but why is this happening on this website and not on the others?
//var html = @"http://html-agility-pack.net/";
var html = @"https://www./";
//var html = @"https://www.google.com/";
HtmlWeb web = new HtmlWeb();
HtmlDocument htmlDoc = web.Load(html);
if (web.StatusCode == HttpStatusCode.OK)
Console.WriteLine("CONNECTION OK");
var node = htmlDoc.DocumentNode.SelectSingleNode("//head/title");
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
Console.ReadLine();
else
Console.WriteLine("No Connection to website");
Console.ReadLine();
c# web-scraping html-agility-pack
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
add a comment |
So I'm trying to scrape a website and I'm using HTML Agility Pack to try and do this. I have tried my code on the html-agility-pack and google websites and it seem to work fine with this simple search.
My problem is the code is returning an error ("System.NullReferenceException: 'Object reference not set to an instance of an object.'") on this line of code:
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
I understand this is happening because the var node is returning Null but why is this happening on this website and not on the others?
//var html = @"http://html-agility-pack.net/";
var html = @"https://www./";
//var html = @"https://www.google.com/";
HtmlWeb web = new HtmlWeb();
HtmlDocument htmlDoc = web.Load(html);
if (web.StatusCode == HttpStatusCode.OK)
Console.WriteLine("CONNECTION OK");
var node = htmlDoc.DocumentNode.SelectSingleNode("//head/title");
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
Console.ReadLine();
else
Console.WriteLine("No Connection to website");
Console.ReadLine();
c# web-scraping html-agility-pack
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
1
I tried your code and it is working fine for me
– uda
Nov 12 '18 at 7:22
@uda It worked the first time but then its returns Null after. I put a loop in and tried a few pages from that site but its not working at all. I think the site is somehow blocking the scraper, is there any way to get around it?
– HitmanHeathcote
Nov 12 '18 at 20:55
can you please show the entire loop code also
– uda
Nov 13 '18 at 1:20
@uda sorry for the late reply, I found out the website was redirecting me to a robot page as it recognised I was scraping. I manually copy and pasted the data I need as I didnt know a way around it.
– HitmanHeathcote
Nov 17 '18 at 10:55
add a comment |
So I'm trying to scrape a website and I'm using HTML Agility Pack to try and do this. I have tried my code on the html-agility-pack and google websites and it seem to work fine with this simple search.
My problem is the code is returning an error ("System.NullReferenceException: 'Object reference not set to an instance of an object.'") on this line of code:
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
I understand this is happening because the var node is returning Null but why is this happening on this website and not on the others?
//var html = @"http://html-agility-pack.net/";
var html = @"https://www./";
//var html = @"https://www.google.com/";
HtmlWeb web = new HtmlWeb();
HtmlDocument htmlDoc = web.Load(html);
if (web.StatusCode == HttpStatusCode.OK)
Console.WriteLine("CONNECTION OK");
var node = htmlDoc.DocumentNode.SelectSingleNode("//head/title");
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
Console.ReadLine();
else
Console.WriteLine("No Connection to website");
Console.ReadLine();
c# web-scraping html-agility-pack
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
So I'm trying to scrape a website and I'm using HTML Agility Pack to try and do this. I have tried my code on the html-agility-pack and google websites and it seem to work fine with this simple search.
My problem is the code is returning an error ("System.NullReferenceException: 'Object reference not set to an instance of an object.'") on this line of code:
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
I understand this is happening because the var node is returning Null but why is this happening on this website and not on the others?
//var html = @"http://html-agility-pack.net/";
var html = @"https://www./";
//var html = @"https://www.google.com/";
HtmlWeb web = new HtmlWeb();
HtmlDocument htmlDoc = web.Load(html);
if (web.StatusCode == HttpStatusCode.OK)
Console.WriteLine("CONNECTION OK");
var node = htmlDoc.DocumentNode.SelectSingleNode("//head/title");
Console.WriteLine("Node Name: " + node.Name + "n" + node.OuterHtml);
Console.ReadLine();
else
Console.WriteLine("No Connection to website");
Console.ReadLine();
c# web-scraping html-agility-pack
c# web-scraping html-agility-pack
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
edited Nov 17 '18 at 16:26
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
asked Nov 11 '18 at 20:47
HitmanHeathcote
105
105
1
I tried your code and it is working fine for me
– uda
Nov 12 '18 at 7:22
@uda It worked the first time but then its returns Null after. I put a loop in and tried a few pages from that site but its not working at all. I think the site is somehow blocking the scraper, is there any way to get around it?
– HitmanHeathcote
Nov 12 '18 at 20:55
can you please show the entire loop code also
– uda
Nov 13 '18 at 1:20
@uda sorry for the late reply, I found out the website was redirecting me to a robot page as it recognised I was scraping. I manually copy and pasted the data I need as I didnt know a way around it.
– HitmanHeathcote
Nov 17 '18 at 10:55
add a comment |
1
I tried your code and it is working fine for me
– uda
Nov 12 '18 at 7:22
@uda It worked the first time but then its returns Null after. I put a loop in and tried a few pages from that site but its not working at all. I think the site is somehow blocking the scraper, is there any way to get around it?
– HitmanHeathcote
Nov 12 '18 at 20:55
can you please show the entire loop code also
– uda
Nov 13 '18 at 1:20
@uda sorry for the late reply, I found out the website was redirecting me to a robot page as it recognised I was scraping. I manually copy and pasted the data I need as I didnt know a way around it.
– HitmanHeathcote
Nov 17 '18 at 10:55
1
1
I tried your code and it is working fine for me
– uda
Nov 12 '18 at 7:22
I tried your code and it is working fine for me
– uda
Nov 12 '18 at 7:22
@uda It worked the first time but then its returns Null after. I put a loop in and tried a few pages from that site but its not working at all. I think the site is somehow blocking the scraper, is there any way to get around it?
– HitmanHeathcote
Nov 12 '18 at 20:55
@uda It worked the first time but then its returns Null after. I put a loop in and tried a few pages from that site but its not working at all. I think the site is somehow blocking the scraper, is there any way to get around it?
– HitmanHeathcote
Nov 12 '18 at 20:55
can you please show the entire loop code also
– uda
Nov 13 '18 at 1:20
can you please show the entire loop code also
– uda
Nov 13 '18 at 1:20
@uda sorry for the late reply, I found out the website was redirecting me to a robot page as it recognised I was scraping. I manually copy and pasted the data I need as I didnt know a way around it.
– HitmanHeathcote
Nov 17 '18 at 10:55
@uda sorry for the late reply, I found out the website was redirecting me to a robot page as it recognised I was scraping. I manually copy and pasted the data I need as I didnt know a way around it.
– HitmanHeathcote
Nov 17 '18 at 10:55
add a comment |
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1
I tried your code and it is working fine for me
– uda
Nov 12 '18 at 7:22
@uda It worked the first time but then its returns Null after. I put a loop in and tried a few pages from that site but its not working at all. I think the site is somehow blocking the scraper, is there any way to get around it?
– HitmanHeathcote
Nov 12 '18 at 20:55
can you please show the entire loop code also
– uda
Nov 13 '18 at 1:20
@uda sorry for the late reply, I found out the website was redirecting me to a robot page as it recognised I was scraping. I manually copy and pasted the data I need as I didnt know a way around it.
– HitmanHeathcote
Nov 17 '18 at 10:55