如何使用C#设置Excel单元格和工作表的背景

Install-Package FreeSpire.XLS

using Spire.Xls;
using System.Drawing;

// 创建工作簿
Workbook workbook = new Workbook();
// 获取第一个工作表
Worksheet sheet = workbook.Worksheets[0];

// 获取单元格，设置单元格文本，设置行高和列宽
CellRange cell = sheet.Range["B2"];
cell.Text = "普通背景色";
cell.RowHeight = 30f;
cell.ColumnWidth = 20f;

// 设置单元格填充类型和背景色
cell.Style.FillPattern = ExcelPatternType.Solid;
cell.Style.Color = Color.LightGreen;

// 保存工作簿
workbook.SaveToFile("output/CellSolidColor.xlsx", ExcelVersion.Version2016);
workbook.Dispose();

using Spire.Xls;
using System.Drawing;

// 创建工作簿，获取工作表
Workbook workbook = new Workbook();
Worksheet sheet = workbook.Worksheets[0];

// 获取单元格，设置单元格文本、行高和列宽
CellRange cell = sheet.Range["B2"];
cell.Text = "纹理背景";
cell.RowHeight = 30f;
cell.ColumnWidth = 20f;

// 设置单元格纹理背景
cell.Style.FillPattern = ExcelPatternType.Angle;
cell.Style.Color = Color.LightGray;  // 背景色
cell.Style.PatternColor = Color.Beige;  // 纹理色


// 保存工作簿
workbook.SaveToFile("output/CellPattern.xlsx", ExcelVersion.Version2016);
workbook.Dispose();

using Spire.Xls;
using System.Drawing;

// 创建工作簿，获取工作表
Workbook workbook = new Workbook();
Worksheet sheet = workbook.Worksheets[0];

// 获取单元格，设置单元格文本、行高和列宽
CellRange cell = sheet.Range["B2"];
cell.Text = "渐变背景";
cell.RowHeight = 30f;
cell.ColumnWidth = 20f;

// 设置单元格渐变背景
cell.Style.FillPattern = ExcelPatternType.Gradient;
cell.Style.Interior.Gradient.BackColor = Color.Pink;
cell.Style.Interior.Gradient.ForeColor = Color.Beige;


// 保存工作簿
workbook.SaveToFile("output/GradientFillColor.xlsx", ExcelVersion.Version2016);
workbook.Dispose();

using Spire.Xls;
using System.Drawing;

// 载入工作簿，获取工作表
Workbook workbook = new Workbook();
workbook.LoadFromFile("Sample.xlsx");
Worksheet sheet = workbook.Worksheets[0];

// 载入背景图
Bitmap image = new Bitmap(Image.FromFile("BackgroundImage1.jpg"));

// 应用背景图到工作表
sheet.PageSetup.BackgoundImage = image;

// 保存工作簿
workbook.SaveToFile("output/SheetBackgroundImage.xlsx");
workbook.Dispose();