一、使用NPOI設定背景色

方法一：使用NOPI自帶的顏色使用方法，缺點就是自帶的樣色種類少，不夠用

HSSFWorkbook hssfworkbook = new HSSFWorkbook();//建立工作薄

styleCommonTextRedColor = hssfworkbook.CreateCellStyle();//建立單元格

//新增顏色

styleCommonTextRedColor.FillPattern = FillPattern.SolidForeground;

styleCommonTextRedColor.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.PaleBlue.Index;

方法二：採用RGB顏色

HSSFWorkbook hssfworkbook = new HSSFWorkbook();//建立工作薄

styleCommonTextRedColor = hssfworkbook.CreateCellStyle();//建立單元格

//自定義顏色

  HSSFPalette palette = hssfworkbook.GetCustomPalette();
  palette.SetColorAtIndex(40, 250, 208, 121);//引數說明，第一個是指調色盤的位置，後三個引數是RGB色值
  HSSFColor hssfColorY = palette.FindColor(250, 208, 121);

 styleColorRed.FillPattern = FillPattern.SolidForeground;
 styleColorRed.FillForegroundColor = hssfColorR.Indexed;

圖片傳輸：

 byte[] bytes = System.IO.File.ReadAllBytes(@"....");
 int pictureIdex = hssfworkbook.AddPicture(bytes, NPOI.SS.UserModel.PictureType.PNG);

 HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch();
 HSSFClientAnchor anchor = new HSSFClientAnchor(0, 25, 158, 62, 0, 0, 0, 1);

 HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdex);

說明：

1. public HSSFClientAnchor(int dx1,int dy1,int dx2,int dy2,short col1,int row1,short col2,
2. int row2);Creates a new client anchor and sets the top-left and bottom-right coordinates of the anchor.
3. Parameters:
4. dx1 - the x coordinate within the first cell.
5. dy1 - the y coordinate within the first cell.
6. dx2 - the x coordinate within the second cell.
7. dy2 - the y coordinate within the second cell.

dx2:第二個單元格的開始X座標

dy2:第二個單元格的開始y座標

1. col1 - the column (0 based); of the first cell.
2. row1 - the row (0 based); of the first cell.
3. col2 - the column (0 based); of the second cell.
4. row2 - the row (0 based); of the second cell.
5. col1 圖片的左上角放在第幾個列cell，
   row1 圖片的左上角放在第幾個行cell，
   
   col2 圖片的右下角放在第幾個列cell，
   row2 圖片的右下角放在第幾個行cell，
6. 列寬
   sheet.setColumnWidth((short)column,(short)width);
   行高
   row.setHeight((short)height);
7. 新增多個圖片時:多個pic應該share同一個DrawingPatriarch在同一個sheet裡面。