在Excel中，可以将边框添加到单个单元格以强调数据，标记汇总值或单元格区域中的数据。边界也可以用不同的线条样式和颜色进行格式化。本文介绍了如何使用Spire.XLS将边框样式应用于Excel单元格。
Step 1: 创建一个工作簿实例并获取第一个工作表。
Workbook wb = new Workbook();
Worksheet sheet = wb.Worksheets[0];
Step 2: 获取您想要应用边框样式的单元格区域。
CellRange range = sheet.Range["B2:D4"];
Step 3: 调用BorderInside（）和BorderAround（）方法将样式应用于范围内和范围的边界。 若要将边框添加到顶部，底部，左侧和右侧，请使用边框[BordersLineType.EdgeTop] .LineStyle属性，边框[BordersLineType.EdgeBottom] .LineStyle属性等。
range.BorderInside(LineStyleType.Thin, Color.Blue);
range.BorderAround(LineStyleType.Medium, Color.Blue);
Step 4: 保存到文件。
wb.SaveToFile("result.xlsx", ExcelVersion.Version2013);
输出：
完整代码：
[C#]
Workbook wb = new Workbook();
Worksheet sheet = wb.Worksheets[0];
//apply border style to the range B2:D4
CellRange range = sheet.Range["B2:D4"];
range.BorderInside(LineStyleType.Thin, Color.Blue);
range.BorderAround(LineStyleType.Medium, Color.Blue);
//apply border style to the range D7:F9
range = sheet.Range["D7:F9"];
range.Borders.LineStyle = LineStyleType.Double;
range.Borders[BordersLineType.DiagonalDown].LineStyle = LineStyleType.None;
range.Borders[BordersLineType.DiagonalUp].LineStyle = LineStyleType.None;
//apply border style to the range F12:H14
range = sheet.Range["F12:H14"];
range.Merge();
range.BorderAround(LineStyleType.Thin);
range.Borders[BordersLineType.DiagonalDown].LineStyle = LineStyleType.Thin;
range.Borders[BordersLineType.EdgeBottom].LineStyle = LineStyleType.Thick;
range.Borders.Color = Color.Red;
wb.SaveToFile("result.xlsx", ExcelVersion.Version2013);
[VB.NET]
Dim wb As Workbook = New Workbook()
Dim sheet As Worksheet = wb.Worksheets(0)
'apply border style to the range B2:D4
Dim range As CellRange = sheet.Range("B2:D4")
range.BorderInside(LineStyleType.Thin, Color.Blue)
range.BorderAround(LineStyleType.Medium, Color.Blue)
'apply border style to the range D7:F9
range = sheet.Range("D7:F9")
range.Borders.LineStyle = LineStyleType.Double
range.Borders(BordersLineType.DiagonalDown).LineStyle = LineStyleType.None
range.Borders(BordersLineType.DiagonalUp).LineStyle = LineStyleType.None
'apply border style to the range F12:H14
range = sheet.Range("F12:H14")
range.Merge()
range.BorderAround(LineStyleType.Thin)
range.Borders(BordersLineType.DiagonalDown).LineStyle = LineStyleType.Thin
range.Borders(BordersLineType.EdgeBottom).LineStyle = LineStyleType.Thick
range.Borders.Color = Color.Red
wb.SaveToFile("result.xlsx", ExcelVersion.Version2013)