/// <summary>
/// Creates a highlight annotation with the specified color and author
/// </summary>
/// <param name="service">the AnnotationService</param>
/// <param name="textRange">highlight anchor</param>
/// <param name="author">highlight author</param>
/// <param name="color">highlight brush</param>
/// <returns>created annotation</returns>
private static Annotation CreateHighlight(AnnotationService service, ITextRange textRange, string author, Nullable<Color> color)
{
Invariant.Assert(textRange != null, "textRange is null");
Annotation annotation = CreateAnnotationForSelection(service, textRange, HighlightComponent.TypeName, author);
// Set the cargo with highlight color
if (color != null)
{
ColorConverter converter = new ColorConverter();
XmlDocument doc = new XmlDocument();
XmlElement colorsElement = doc.CreateElement(HighlightComponent.ColorsContentName, AnnotationXmlConstants.Namespaces.BaseSchemaNamespace);
colorsElement.SetAttribute(HighlightComponent.BackgroundAttributeName, converter.ConvertToInvariantString(color.Value));
AnnotationResource cargo = new AnnotationResource(HighlightComponent.HighlightResourceName);
cargo.Contents.Add(colorsElement);
annotation.Cargos.Add(cargo);
}
return annotation;
}
