I have something like this:
class MyTask
{
public MyTask(int id)
{
Id = id;
IsBusy = false;
Document = new HtmlDocument();
}
public HtmlDocument Document { get; set; }
public int Id { get; set; }
public bool IsBusy { get; set; }
}
class Program
{
public static void Main()
{
var task = new MyTask(1);
task.Document.LoadHtml("http://urltomysite");
if (task.Document.DocumentNode.SelectNodes("//span[@class='some-class']").Count == 0)
{
task.IsBusy = false;
return;
}
}
}
Now when I start my program, it throws an error on the if
sttement, saying that Object reference not set to an instance of an object.
. Why isn't it loading my page? What am I doing wrong here?
You are looking for .Load()
.
.LoadHtml()
expects to be given physical HTML. You are giving a website to go to:
HtmlWeb website = new HtmlWeb();
HtmlDocument rootDocument = website.Load("http://www.example.com");
In addition to Arran's answer
If .SelectNodes("//span[@class='some-class']")
doesn't return any nodes and is null
then doing a Count
on it will give this exception.
Try
if (task.Document.DocumentNode.SelectNodes("//span[@class='some-class']") != null &&
task.Document.DocumentNode.SelectNodes("//span[@class='some-class']").Count == 0)
{
task.IsBusy = false;
return;
}
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