準備工作

首先，下載Spire.xls功能類庫 ，點擊這里下載 ；

然后，在后端代碼引入命名空間。

using Spire.Xls;
using Spire.Xls.Core.Spreadsheet.ConditionalFormatting;
using Spire.Xls.Core.Spreadsheet.Collections;
using Spire.Xls.Core;

按條件設置單元格樣式

            Workbook workbook = new Workbook();            
            workbook.LoadFromFile(@"..\..\..\..\..\..\Data\ConditionalFormatting.xlsx");

             //按索引指定sheet表
            Worksheet sheet = workbook.Worksheets[0];

            sheet.AllocatedRange.RowHeight = 15;
            sheet.AllocatedRange.ColumnWidth = 16;

            //創建條件格式樣式
            XlsConditionalFormats xcfs1 = sheet.ConditionalFormats.Add();
            xcfs1.AddRange(sheet.Range["A1:D1"]);
            IConditionalFormat cf1 = xcfs1.AddCondition();
            cf1.FormatType = ConditionalFormatType.CellValue;
            cf1.FirstFormula = "150";
            cf1.Operator = ComparisonOperatorType.Greater;
            cf1.FontColor = Color.Red;
            cf1.BackColor = Color.LightBlue;

            XlsConditionalFormats xcfs2 = sheet.ConditionalFormats.Add();
            xcfs2.AddRange(sheet.Range["A2:D2"]);
            IConditionalFormat cf2 = xcfs2.AddCondition();
            cf2.FormatType = ConditionalFormatType.CellValue;
            cf2.FirstFormula = "300";
            cf2.Operator = ComparisonOperatorType.Less;
            //設置邊框
            cf2.LeftBorderColor = Color.Pink;
            cf2.RightBorderColor = Color.Pink;
            cf2.TopBorderColor = Color.DeepSkyBlue;
            cf2.BottomBorderColor = Color.DeepSkyBlue;
            cf2.LeftBorderStyle = LineStyleType.Medium;
            cf2.RightBorderStyle = LineStyleType.Thick;
            cf2.TopBorderStyle = LineStyleType.Double;
            cf2.BottomBorderStyle = LineStyleType.Double;

            //添加數據條
            XlsConditionalFormats xcfs3 = sheet.ConditionalFormats.Add();
            xcfs3.AddRange(sheet.Range["A3:D3"]);
            IConditionalFormat cf3 = xcfs3.AddCondition();
            cf3.FormatType = ConditionalFormatType.DataBar;
            cf3.DataBar.BarColor = Color.CadetBlue;

            //添加icon
            XlsConditionalFormats xcfs4 = sheet.ConditionalFormats.Add();
            xcfs4.AddRange(sheet.Range["A4:D4"]);
            IConditionalFormat cf4 = xcfs4.AddCondition();
            cf4.FormatType = ConditionalFormatType.IconSet;
            cf4.IconSet.IconSetType = IconSetType.ThreeTrafficLights1;

            //添加顏色
            XlsConditionalFormats xcfs5 = sheet.ConditionalFormats.Add();
            xcfs5.AddRange(sheet.Range["A5:D5"]);
            IConditionalFormat cf5 = xcfs5.AddCondition();
            cf5.FormatType = ConditionalFormatType.ColorScale;
            
            //在 "A7:D7 "范圍內用BurlyWood顏色突出重復的數值
            XlsConditionalFormats xcfs6 = sheet.ConditionalFormats.Add();
            xcfs6.AddRange(sheet.Range["A6:D6"]);
            IConditionalFormat cf6 = xcfs6.AddCondition();
            cf6.FormatType = ConditionalFormatType.DuplicateValues;
            cf6.BackColor = Color.BurlyWood;

            //保存
            workbook.SaveToFile("Output.xlsx", ExcelVersion.Version2010);

以上內容設置，我們可以在應用程序中為數據貼標簽后輸出，效率會比輸出后人工打標簽更為快捷。