IWatermarkAnnotation
IWatermarkAnnotation interface
定义水印注释属性
public interface IWatermarkAnnotation : IAngle, IBox, IFontColor, IFontFamily, IFontSize, 
    IHorizontalAlignment, IOpacity, IText, IVerticalAlignment
也可以看看
- interface IAngle
 - interface IBox
 - interface IFontColor
 - interface IFontFamily
 - interface IFontSize
 - interface IHorizontalAlignment
 - interface IOpacity
 - interface IText
 - interface IVerticalAlignment
 - 命名空间 GroupDocs.Annotation.Models.AnnotationModels.Interfaces.Annotations
 - 部件 GroupDocs.Annotation