1、在VS程序中引用dll文件，如下图：
2、在程序中键入如下代码内容：
C#
using Spire.Doc;
using Spire.Doc.Documents;
namespace AddHorizontalLine
{
class Program
{
static void Main(string[] args)
{
//加载Word测试文档
Document doc = new Document();
doc.LoadFromFile("test.docx");
//获取节和段落
Section section = doc.Sections[0];
Paragraph paragraph = section.Paragraphs[4];
//添加横线
paragraph.AppendHorizonalLine();
//保存文档
doc.SaveToFile("output.docx");
System.Diagnostics.Process.Start("output.docx");
}
}
}
VB.NET
Imports Spire.Doc
Imports Spire.Doc.Documents
Namespace AddHorizontalLine
Class Program
Private Shared Sub Main(args As String())
'加载Word测试文档
Dim doc As New Document()
doc.LoadFromFile("test.docx")
'获取节和段落
Dim section As Section = doc.Sections(0)
Dim paragraph As Paragraph = section.Paragraphs(4)
'添加横线
paragraph.AppendHorizonalLine()
'保存文档
doc.SaveToFile("output.docx")
System.Diagnostics.Process.Start("output.docx")
End Sub
End Class
End Namespace
3、执行程序，生成文档。在生成的结果文档中可查看已添加的横线效果，如图：
