單元內的文本可以通過使用Essential Studio中的RichText functionality of XlsIO設置。下面是示例代碼：

[C#]

// Insert Rich Text.
IRange range = sheet.Range["A1"];
range.Text = "RichText";
IRichTextString rtf = range.RichText;
 
// Formatting first 4 characters.
IFont redFont = workbook.CreateFont();
redFont.Bold = true;
redFont.Italic = true;
redFont.RGBColor = Color.Red;
rtf.SetFont(0, 3, redFont);
 
// Formatting last 4 characters.
IFont blueFont = workbook.CreateFont();
blueFont.Bold = true;
blueFont.Italic = true;
blueFont.RGBColor = Color.Blue;
rtf.SetFont(4, 7, blueFont);  

[VB.NET]

' Insert Rich Text.
Dim range As Syncfusion.XlsIO.IRange = sheet.Range("A1")
range.Text = "RichText"
Dim rtf As Syncfusion.XlsIO.IRichTextString = range.RichText
 
' Formatting first 4 characters.
Dim redFont As Syncfusion.XlsIO.IFont = workbook.CreateFont()
redFont.Bold = True
redFont.Italic = True
redFont.RGBColor = Color.Red
rtf.SetFont(0, 3, redFont)
 
' Formatting last 4 characters.
Dim blueFont As Syncfusion.XlsIO.IFont = workbook.CreateFont()
blueFont.Bold = True
blueFont.Italic = True
blueFont.RGBColor = Color.Blue
rtf.SetFont(4, 7, blueFont)