Creating an HTML Document – Create or Load HTML in C#

 1// Create an empty HTML document using C#
 2
 3// Prepare an output path for a document saving
 4string documentPath = Path.Combine(OutputDir, "create-empty-document.html");
 5
 6// Initialize an empty HTML Document
 7using (HTMLDocument document = new HTMLDocument())
 8{
 9    // Work with the document
10
11    // Save the document to a file
12    document.Save(documentPath);
13}

 1// Create an HTML document using C#
 2
 3// Prepare an output path for a document saving
 4string documentPath = Path.Combine(OutputDir, "create-new-document.html");
 5
 6// Initialize an empty HTML Document
 7using (HTMLDocument document = new HTMLDocument())
 8{
 9    // Create a text node and add it to the document
10    Text text = document.CreateTextNode("Hello, World!");
11    document.Body.AppendChild(text);
12
13    // Save the document to a disk
14    document.Save(documentPath);
15}

 1// Load HTML from a file using C#
 2
 3string htmlFile = Path.Combine(OutputDir, "load-from-file.html");
 4
 5// Prepare a load-from-file.html document
 6File.WriteAllText(htmlFile, "Hello, World!");
 7
 8// Load from the load-from-file.html 
 9using (HTMLDocument document = new HTMLDocument(htmlFile))
10{
11    // Write the document content to the output stream
12    Console.WriteLine(document.DocumentElement.OuterHTML);
13}

 1// Load an HTML documment from a file using C#
 2
 3// Prepare a file path
 4string documentPath = Path.Combine(DataDir, "sprite.html");
 5
 6// Initialize an HTML document from the file
 7using (HTMLDocument document = new HTMLDocument(documentPath))
 8{
 9    // Work with the document
10
11    // Save the document to a disk
12    document.Save(Path.Combine(OutputDir, "sprite_out.html"));
13}

 1// Load HTML from a URL using C#
 2
 3// Load a document from 'https://docs.aspose.com/html/files/document.html' web page
 4using (HTMLDocument document = new HTMLDocument("https://docs.aspose.com/html/files/document.html"))
 5{
 6    string html = document.DocumentElement.OuterHTML;
 7
 8    // Write the document content to the output stream
 9    Console.WriteLine(html);
10}

 1// Create HTML from a string using C#
 2
 3// Prepare HTML code
 4string html_code = "<p>Hello, World!</p>";
 5
 6// Initialize a document from the string variable
 7using (HTMLDocument document = new HTMLDocument(html_code, "."))
 8{
 9    // Save the document to a disk
10    document.Save(Path.Combine(OutputDir, "create-from-string.html"));
11}

 1// Load HTML from a stream using C#
 2
 3// Create a memory stream object
 4using (MemoryStream mem = new MemoryStream())
 5using (StreamWriter sw = new StreamWriter(mem))
 6{
 7    // Write the HTML code into memory object
 8    sw.Write("<p>Hello, World! I love HTML!</p>");
 9
10    // It is important to set the position to the beginning, since HTMLDocument starts the reading exactly from the current position within the stream
11    sw.Flush();
12    mem.Seek(0, SeekOrigin.Begin);
13
14    // Initialize a document from the string variable
15    using (HTMLDocument document = new HTMLDocument(mem, "."))
16    {
17        // Save the document to disk
18        document.Save(Path.Combine(OutputDir, "load-from-stream.html"));
19    }
20}

1// Load SVG from a string using C#
2
3// Initialize an SVG document from a string object
4using (SVGDocument document = new SVGDocument("<svg xmlns='http://www.w3.org/2000/svg'><circle cx='50' cy='50' r='40'/></svg>", "."))
5{
6    // Write the document content to the output stream
7    Console.WriteLine(document.DocumentElement.OuterHTML);
8}

 1// Load HTML asynchronously using C#
 2
 3// Initialize an AutoResetEvent
 4AutoResetEvent resetEvent = new AutoResetEvent(false);
 5
 6// Create an instance of an HTML document
 7HTMLDocument document = new HTMLDocument();
 8
 9// Create a string variable for the OuterHTML property reading
10string outerHTML = string.Empty;
11
12// Subscribe to ReadyStateChange event
13// This event will be fired during the document loading process
14document.OnReadyStateChange += (sender, @event) =>
15{
16    // Check the value of the ReadyState property
17    // This property is representing the status of the document. For detail information please visit https://www.w3schools.com/jsref/prop_doc_readystate.asp
18    if (document.ReadyState == "complete")
19    {
20        // Fill the outerHTML variable by value of loaded document                  
21        outerHTML = document.DocumentElement.OuterHTML;
22        resetEvent.Set();
23    }
24};
25
26// Navigate asynchronously at the specified Uri
27document.Navigate("https://docs.aspose.com/html/files/document.html");
28
29// Here the outerHTML is empty yet
30
31Console.WriteLine($"outerHTML = {outerHTML}");
32
33//  Wait 5 seconds for the file to load
34
35// Here the outerHTML is filled 
36Console.WriteLine("outerHTML = {0}", outerHTML);

 1// Handle an HTML document load using C#
 2
 3// Initialize an AutoResetEvent
 4AutoResetEvent resetEvent = new AutoResetEvent(false);
 5
 6// Initialize an HTML document
 7HTMLDocument document = new HTMLDocument();
 8bool isLoading = false;
 9
10// Subscribe to the OnLoad event
11// This event will be fired once the document is fully loaded
12document.OnLoad += (sender, @event) =>
13{
14    isLoading = true;
15    resetEvent.Set();
16};
17
18// Navigate asynchronously at the specified Uri
19document.Navigate("https://docs.aspose.com/html/files/document.html");
20
21Console.WriteLine("outerHTML = {0}", document.DocumentElement.OuterHTML);