Spire.XLS of.net 怎么设置字体样式（普通单元格和带公式的单元格）

    //创建字体
    ExcelFont font1 = workbook.CreateFont();

    //设置字体，字形，大小，颜色
    font1.FontName = "宋体";
    font1.IsBold = true;
    font1.Size = 10;
    font1.KnownColor = ExcelColors.Blue;

    //为A1单元格写入数据并设置字体
    RichText richText = sheet.Range["A1"].RichText;
    richText.Text = "Excel字体设置";
    richText.SetFont(0, richText.Text.ToArray().Length - 1, font1);

RichText richText = sheet.Range["A1"].RichText;

CellRange cellRange = sheet.Range[point];
cellRange.Formula = processesComponetPos[j].Requirements.ToString(); 
CellStyle style = workbook.Styles.Add("myStyle");
style.Font.Size = 9;
style.Font.FontName = "宋体";
// 应用样式到单元格
cellRange.Style = style;