vbfox/HtmlFragment.cs

## HtmlFragment.cs
static class HtmlFragment
{
    const string HTML_FRAGMENT_HEADER = "Version:0.9\r\nStartHTML:{0:000000}\r\nEndHTML:{1:000000}"
        + "\r\nStartFragment:{2:000000}\r\nEndFragment:{3:000000}\r\n";

    const string HTML_FRAGMENT_BEGIN = "<html>\r\n<head>\r\n"
        + "<meta http-equiv=\"Content-Type\" content=\"text/html; charset={0}\">\r\n</head>\r\n"
        + "<body>\r\n<!--StartFragment-->";

    const string HTML_FRAGMENT_END = "<!--EndFragment-->\r\n</body>\r\n</html>\r\n";

    static readonly Encoding htmlFragmentEncoding = Encoding.UTF8;

    static string HtmlToHtmlFragment(string html)
    {
        Debug.Assert(html != null);

        /* Regarding the specific format of HTML fragments
         * See the MSDN : http://msdn.microsoft.com/en-us/library/aa767917.aspx
         * Or this blog : http://tommycarlier.blogspot.com/2005/08/copying-html-fragment-to-clipboard.html
         */

        var htmlBegin = string.Format(HTML_FRAGMENT_BEGIN, htmlFragmentEncoding.WebName);

        var beginSample = String.Format(HTML_FRAGMENT_HEADER, 0, 0, 0, 0);

        int countBegin = htmlFragmentEncoding.GetByteCount(beginSample);
        int countHtmlBegin = htmlFragmentEncoding.GetByteCount(htmlBegin);
        int countHtml = htmlFragmentEncoding.GetByteCount(html);
        int countHtmlEnd = htmlFragmentEncoding.GetByteCount(HTML_FRAGMENT_END);

        var finalBegin = String.Format(HTML_FRAGMENT_HEADER, countBegin,
            countBegin + countHtmlBegin + countHtml + countHtmlEnd,
            countBegin + countHtmlBegin,
            countBegin + countHtmlBegin + countHtml);

        return finalBegin + htmlBegin + html + HTML_FRAGMENT_END;
    }

    static MemoryStream HtmlToHtmlFragmentStream(string html)
    {
        Debug.Assert(html != null);

        var htmlTotal = HtmlToHtmlFragment(html);

        return new MemoryStream(Encoding.UTF8.GetBytes(htmlTotal));
    }

    public static void SetHtmlFragment(this DataObject dataObject, string html)
    {
        if (dataObject == null) throw new ArgumentNullException("dataObject");
        if (html == null) throw new ArgumentNullException("html");

        var stream = HtmlToHtmlFragmentStream(html);
        dataObject.SetData(DataFormats.Html, stream);
    }
}

## Sample.cs
class HtmlFragmentProgram
{
    void Main()
    {
        var dataObj = new DataObject();
        dataObj.SetHtmlFragment("<table border=1><tr><td><b>1.22</b></td><td>1.98</td></td></table>");
        dataObj.Dump();
        Clipboard.SetDataObject(dataObj);
    }
}
	static class HtmlFragment
	{
	const string HTML_FRAGMENT_HEADER = "Version:0.9\r\nStartHTML:{0:000000}\r\nEndHTML:{1:000000}"
	+ "\r\nStartFragment:{2:000000}\r\nEndFragment:{3:000000}\r\n";

	const string HTML_FRAGMENT_BEGIN = "<html>\r\n<head>\r\n"
	+ "<meta http-equiv=\"Content-Type\" content=\"text/html; charset={0}\">\r\n</head>\r\n"
	+ "<body>\r\n<!--StartFragment-->";

	const string HTML_FRAGMENT_END = "<!--EndFragment-->\r\n</body>\r\n</html>\r\n";

	static readonly Encoding htmlFragmentEncoding = Encoding.UTF8;

	static string HtmlToHtmlFragment(string html)
	{
	Debug.Assert(html != null);

	/* Regarding the specific format of HTML fragments
	* See the MSDN : http://msdn.microsoft.com/en-us/library/aa767917.aspx
	* Or this blog : http://tommycarlier.blogspot.com/2005/08/copying-html-fragment-to-clipboard.html
	*/

	var htmlBegin = string.Format(HTML_FRAGMENT_BEGIN, htmlFragmentEncoding.WebName);

	var beginSample = String.Format(HTML_FRAGMENT_HEADER, 0, 0, 0, 0);

	int countBegin = htmlFragmentEncoding.GetByteCount(beginSample);
	int countHtmlBegin = htmlFragmentEncoding.GetByteCount(htmlBegin);
	int countHtml = htmlFragmentEncoding.GetByteCount(html);
	int countHtmlEnd = htmlFragmentEncoding.GetByteCount(HTML_FRAGMENT_END);

	var finalBegin = String.Format(HTML_FRAGMENT_HEADER, countBegin,
	countBegin + countHtmlBegin + countHtml + countHtmlEnd,
	countBegin + countHtmlBegin,
	countBegin + countHtmlBegin + countHtml);

	return finalBegin + htmlBegin + html + HTML_FRAGMENT_END;
	}

	static MemoryStream HtmlToHtmlFragmentStream(string html)
	{
	Debug.Assert(html != null);

	var htmlTotal = HtmlToHtmlFragment(html);

	return new MemoryStream(Encoding.UTF8.GetBytes(htmlTotal));
	}

	public static void SetHtmlFragment(this DataObject dataObject, string html)
	{
	if (dataObject == null) throw new ArgumentNullException("dataObject");
	if (html == null) throw new ArgumentNullException("html");

	var stream = HtmlToHtmlFragmentStream(html);
	dataObject.SetData(DataFormats.Html, stream);
	}
	}
	class HtmlFragmentProgram
	{
	void Main()
	{
	var dataObj = new DataObject();
	dataObj.SetHtmlFragment("<table border=1><tr><td><b>1.22</b></td><td>1.98</td></td></table>");
	dataObj.Dump();
	Clipboard.SetDataObject(dataObj);
	}
	}