public void NodeFilterUsageTest()
{
// Prepare an HTML code
var code = @"
<p>Hello</p>
<img src='image1.png'>
<img src='image2.png'>
<p>World!</p>";
// Initialize a document based on the prepared code
using (var document = new HTMLDocument(code, "."))
{
// To start HTML navigation we need to create an instance of TreeWalker.
// The specified parameters mean that it starts walking from the root of the document, iterating all nodes and use our custom implementation of the filter
using (var iterator = document.CreateTreeWalker(document, NodeFilter.SHOW_ALL, new OnlyImageFilter()))
{
while (iterator.NextNode() != null)
{
// Since we are using our own filter, the current node will always be an instance of the HTMLImageElement.
// So, we don't need the additional validations here.
var image = (HTMLImageElement)iterator.CurrentNode;
Output.WriteLine(image.Src);
// output: image1.png
// output: image2.png
// Set an html variable for the document
var html = document.DocumentElement.OuterHTML;
Assert.Contains("<p>", html);
}
}
}
}
