请参考以下示例代码。您可以参考代码段，然后根据需要编写/更新自己的代码。
例如，在一个实施例中，

示例代码：

//Instantiating a Workbook object
Workbook workbook = new Workbook();
Worksheet sheet = workbook.Worksheets[0];
int index = sheet.ConditionalFormattings.Add();
FormatConditionCollection fcs = sheet.ConditionalFormattings[index];
//Sets the conditional format range.
CellArea ca = new CellArea();//A1:A11
ca.StartRow = 0;
ca.EndRow = 10;
ca.StartColumn = 0;
ca.EndColumn = 0;
fcs.AddArea(ca);
//Adds condition.
int conditionIndex = fcs.AddCondition(FormatConditionType.CellValue, OperatorType.LessThan, "0", null);
           
//Sets the formatting based on condition.
FormatCondition fc1 = fcs[conditionIndex];
fc1.Style.Custom = "#,##0,00;[Red]#,##0,00";
fc1.Style.BackgroundColor = System.Drawing.Color.Gray;
fc1.Style.Font.Color = System.Drawing.Color.Red;
//Saving the Excel file
workbook.Save("g:\\test2\\out1.xlsx");

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您也可以在专用的forum中发布您的疑问或进一步讨论。
PS.我在Aspose担任支持开发人员/布道者。