Question
What is the syntax for using a variable in the SelectNodes parameters?
For example,
string foo = "bar";
This works
nodes = hd.DocumentNode.SelectNodes("//span[@id='bar']");
But
nodes = hd.DocumentNode.SelectNodes("//span[@id=foo]");
finds no nodes. The issue arises because I can't be sure what the id string will be, so I have to use the variable approach. What is the proper syntax?
The html looks like
<span id="bar">text</span>
Popular Answer
The parameter accepted by SelectNodes is just a string. You could declare a string in advance or just do it all in one line.
string idName = "bar";
string xpath = "//span[@id='" + idName + "']";
nodes = hd.DocumentNode.SelectNodes(xpath);
Or another way to do the same thing with a different string formatter:
string idName = "bar";
nodes = hd.DocumentNode.SelectNodes($"//span[@id='{idName}']");
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