在本文中，我们将为您提供有关如何使用 C# 添加折线注释的简明指南。在许多情况下，有必要向 PDF 文档添加注释以提供附加信息或突出文档的特定区域。一种常用的注释类型是折线注释。我们将为您提供一个实际示例，演示如何在 C# 中添加折线注释。本文包含分步过程和示例代码，可指导您完成添加多段线注释的过程。
使用 C# 添加折线注释的步骤
- 通过 NuGet 包管理器安装 GroupDocs.Annotation for .NET 以在 PDF 中添加折线注释
- 在您的项目中添加 GroupDocs.Annotation 命名空间的引用
- 通过将 PDF 文件的路径作为参数传递给其构造函数来实例化 Annotator 类
- 创建 PolylineAnnotation 类的实例并定义必要的属性，例如位置和 SVG 路径
- 调用 Annotator 类的 Add 方法并提供 PolylineAnnotation 对象作为参数
- 调用 Annotator.Save 方法保存最终输出的 PDF
我们概述了上述步骤，以帮助您轻松添加 折线注释 C# 功能。只要安装了 .NET，您就可以在流行的操作系统（如 Windows、macOS 和 Linux）上使用这些说明。此外，您不需要安装任何额外的软件。下面的代码示例演示了如何向 PDF 添加折线注释。
使用 C# 添加折线注释的代码
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| using GroupDocs.Annotation.Models.AnnotationModels; | |
| using GroupDocs.Annotation.Models; | |
| using GroupDocs.Annotation; | |
| using System; | |
| using System.Collections.Generic; | |
| namespace AddPolylineAnnotationUsingCSharp | |
| { | |
| internal class Program | |
| { | |
| static void Main(string[] args) | |
| { | |
| // Set License to avoid the limitations of Annotation library | |
| License lic = new License(); | |
| lic.SetLicense(@"GroupDocs.Annotation.lic"); | |
| // Instantiate Annotator object by passing path of PDF | |
| // file to its constructor | |
| using (Annotator annotator = new Annotator("input.pdf")) | |
| { | |
| PolylineAnnotation polyline = new PolylineAnnotation | |
| { | |
| Box = new Rectangle(250, 35, 102, 12), | |
| CreatedOn = DateTime.Now, | |
| Message = "This is polyline annotation", | |
| Opacity = 0.7, | |
| PageNumber = 0, | |
| PenColor = 65535, | |
| PenStyle = PenStyle.Dot, | |
| PenWidth = 3, | |
| Replies = new List<Reply> | |
| { | |
| new Reply | |
| { | |
| Comment = "First comment", | |
| RepliedOn = DateTime.Now | |
| }, | |
| new Reply | |
| { | |
| Comment = "Second comment", | |
| RepliedOn = DateTime.Now | |
| } | |
| }, | |
| SvgPath = "M250.8280751173709,48.209295774647885l0.6986854460093896,0l0.6986854460093896,-1.3973708920187793l0.6986854460093896,0l0.6986854460093896,-1.3973708920187793l1.3973708920187793,-0.6986854460093896l0.6986854460093896,-0.6986854460093896l0.6986854460093896,0l2.096056338028169,-1.3973708920187793l3.493427230046948,-1.3973708920187793l0.6986854460093896,-0.6986854460093896l1.3973708920187793,-1.3973708920187793l0.6986854460093896,0l1.3973708920187793,-0.6986854460093896l0.6986854460093896,0l0.6986854460093896,-0.6986854460093896l0.6986854460093896,0l0.6986854460093896,0l0,-0.6986854460093896l0.6986854460093896,0l0.6986854460093896,0l1.3973708920187793,0l0,-0.6986854460093896l0.6986854460093896,0l1.3973708920187793,0l0.6986854460093896,0l1.3973708920187793,0l0.6986854460093896,0l2.096056338028169,-0.6986854460093896l1.3973708920187793,0l0.6986854460093896,0l0.6986854460093896,0l1.3973708920187793,0l1.3973708920187793,0l1.3973708920187793,0l2.096056338028169,0l5.589483568075117,0l1.3973708920187793,0l2.096056338028169,0l0.6986854460093896,0l1.3973708920187793,0l0.6986854460093896,0l1.3973708920187793,0l1.3973708920187793,0l0.6986854460093896,0.6986854460093896l1.3973708920187793,0l2.096056338028169,1.3973708920187793l0.6986854460093896,0l0.6986854460093896,0l0,0.6986854460093896l1.3973708920187793,0l0.6986854460093896,0.6986854460093896l1.3973708920187793,0.6986854460093896l0,0.6986854460093896l0.6986854460093896,0l1.3973708920187793,0.6986854460093896l1.3973708920187793,0.6986854460093896l3.493427230046948,0.6986854460093896l1.3973708920187793,0.6986854460093896l2.096056338028169,0.6986854460093896l1.3973708920187793,0.6986854460093896l1.3973708920187793,0l1.3973708920187793,0.6986854460093896l0.6986854460093896,0l0.6986854460093896,0.6986854460093896l1.3973708920187793,0l0.6986854460093896,0l0.6986854460093896,0l2.7947417840375586,0l1.3973708920187793,0l0.6986854460093896,0l1.3973708920187793,0l0.6986854460093896,0l0.6986854460093896,0l1.3973708920187793,0l0.6986854460093896,0l2.7947417840375586,0l0.6986854460093896,0l2.7947417840375586,0l1.3973708920187793,0l0.6986854460093896,0l0.6986854460093896,0l0.6986854460093896,0l0.6986854460093896,0l0.6986854460093896,0l0.6986854460093896,0l0.6986854460093896,-0.6986854460093896l0.6986854460093896,0" | |
| }; | |
| // Add polyline annotation to Annotator | |
| annotator.Add(polyline); | |
| // Save the final PDF to disk | |
| annotator.Save("result.pdf"); | |
| } | |
| } | |
| } | |
| } |
在前面的示例中，我们展示了如何使用 C# 代码进行折线注释。如您所见，我们只需要进行几次 API 调用即可完成此任务。安装注释库并更新输入和输出文件路径后，您可以将提供的代码无缝地合并到您的应用程序中。此外，您还可以选择包括其他类型的注释，例如区域、箭头、距离、突出显示、链接、替换、删除线等。
我们已经讨论了向 PDF 文件添加删除线注释的过程。如果您想了解有关此主题的更多信息，请查看我们在 如何使用 C# 在 PDF 中添加删除线注释 上的指南。
