因为我是NPOI的新手,我想在Excel工作表的单元格中添加颜色。我有一个像'#ffeeff'这样的十六进制值,在ICellStyle.FillForegroundColor
中只能指定短整数值。
System.OverflowException:对于Int16,值太大或太小。
我尝试过像这样的代码,它正在运行
style.FillForegroundColor = HSSFColor.Grey25Percent.Index;
但我只有可以转换为int的十六进制值,但它只支持short int值。
//it is working
style.FillForegroundColor = HSSFColor.Grey25Percent.Index;
// not working for me as '#ffeeff' canot be converted to short, it can only be converted to int
style.FillForegroundColor = short.Parse(fontcolorCode.Substring(1), NumberStyles.HexNumber)
style.FillForegroundColor = short.Parse(fontcolorCode.Substring(1), NumberStyles.HexNumber)
它不应该抛出错误,并且在excel表中,必须将相同的颜色(fontcolorCode)应用于单元格
short
(Int16
)对于这个值来说还不够大。取代int
(Int32
):
string myHexColor = "#ffeeff";
int x = int.Parse(myHexColor.Substring(1), NumberStyles.HexNumber);
Console.WriteLine("Color is: " + x); // 16772863
Console.WriteLine("Max short: " + short.MaxValue); // 32767
Console.WriteLine("Max int: " + int.MaxValue); // 2147483647
您必须创建一个Color对象:
string myHexColor = "#ffeeff";
byte r = Convert.ToByte(myHexColor.Substring(1, 2).ToUpper(), 16);
byte g = Convert.ToByte(myHexColor.Substring(3, 2), 16);
byte b = Convert.ToByte(myHexColor.Substring(5, 2), 16);
Console.WriteLine("{0} = {1}/{2}/{3}", myHexColor, r, g, b);
IWorkbook workbook = null;
NPOI.XSSF.UserModel.XSSFCellStyle style = (NPOI.XSSF.UserModel.XSSFCellStyle)workbook.CreateCellStyle();
// Here we create a color from RGB-values
IColor color = new NPOI.XSSF.UserModel.XSSFColor(new byte[] { r, g, b });
style.SetFillForegroundColor(color );
ICell cellToPaint = null; // Select your cell..
cellToPaint.CellStyle = style;