} //CanConvertFrom
/// <summary>
/// Performs the conversion from string to a HtmlFontProperty (only)
/// </summary>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string)
{
// define a new font property
string fontString = (string)value;
HtmlFontProperty font = new HtmlFontProperty(string.Empty);;
try
{
// parse the contents of the given string using a regex
string fontName = string.Empty;
string fontSize = string.Empty;
Regex expression = new Regex(FONT_PARSE_EXPRESSION, RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.ExplicitCapture);
Match match = expression.Match(fontString);
// see if a match was found
if (match.Success)
{
// extract the content type elements
fontName = match.Result(FONT_PARSE_NAME);
fontSize = match.Result(FONT_PARSE_SIZE);
// set the fontname
TextInfo text = Thread.CurrentThread.CurrentCulture.TextInfo;
font.Name = text.ToTitleCase(fontName);
// determine size from given string using Small if blank
if (fontSize == string.Empty)
{
fontSize = "Small";
}
font.Size = (HtmlFontSize)Enum.Parse(typeof(HtmlFontSize), fontSize, true);
}
}
catch (Exception)
{
// do nothing but ensure font is a null font
font.Name = string.Empty;
}
if (HtmlFontProperty.IsNull(font))
{
// error performing the string conversion so throw exception given possible format
string error = string.Format(@"Cannot convert '{0}' to Type HtmlFontProperty. Format: 'FontName, HtmlSize', Font Size values: {1}", fontString, string.Join(", ", Enum.GetNames(typeof(HtmlFontSize))));
throw new ArgumentException(error);
}
else
{
// return the font
return(font);
}
}
else
{
return(base.ConvertFrom(context, culture, value));
}
} //ConvertFrom
} //IsNull
/// <summary>
/// Based on a font name being null the font can be assumed to be null
/// Default constructor will give a null object
/// </summary>
public static bool IsNotNull(HtmlFontProperty font)
{
return(!HtmlFontProperty.IsNull(font));
} //IsNull