1  #region 从Excel导入
 2         /// <summary>
 3         /// 读取excel ,默认第一行为标头
 4         /// </summary>
 5         /// <param name="strFileName">excel文档路径</param>
 6         /// <returns></returns>
 7         public static DataTable ExcelImport(string strFileName)
 8         {
 9             DataTable dt = new DataTable();
10 
11             ISheet sheet = null;
12             using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
13             {
14                 if (strFileName.IndexOf(".xlsx") == -1)//2003
15                 {
16                     HSSFWorkbook hssfworkbook = new HSSFWorkbook(file);
17                     sheet = hssfworkbook.GetSheetAt(0);
18                 }
19                 else//2007
20                 {
21                     XSSFWorkbook xssfworkbook = new XSSFWorkbook(file);
22                     sheet = xssfworkbook.GetSheetAt(0);
23                 }
24             }
25 
26             System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
27 
28             IRow headerRow = sheet.GetRow(0);
29             int cellCount = headerRow.LastCellNum;
30 
31             for (int j = 0; j < cellCount; j++)
32             {
33                 ICell cell = headerRow.GetCell(j);
34                 dt.Columns.Add(cell.ToString());
35             }
36 
37             for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
38             {
39                 IRow row = sheet.GetRow(i);
40                 DataRow dataRow = dt.NewRow();
41 
42                 for (int j = row.FirstCellNum; j < cellCount; j++)
43                 {
44                     if (row.GetCell(j) != null)
45                         dataRow[j] = row.GetCell(j).ToString();
46                 }
47 
48                 dt.Rows.Add(dataRow);
49             }
50             return dt;
51         }
52         #endregion

 #region RGB颜色转NPOI颜色
        private static short GetXLColour(HSSFWorkbook workbook, Color SystemColour)
        {
            short s = 0;
            HSSFPalette XlPalette = workbook.GetCustomPalette();
            NPOI.HSSF.Util.HSSFColor XlColour = XlPalette.FindColor(SystemColour.R, SystemColour.G, SystemColour.B);
            if (XlColour == null)
            {
                if (NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE < 255)
                {
                    XlColour = XlPalette.FindSimilarColor(SystemColour.R, SystemColour.G, SystemColour.B);
                    s = XlColour.Indexed;
                }

            }
            else
                s = XlColour.Indexed;
            return s;
        }
        #endregion

        #region 设置列的对齐方式
        /// <summary>
        /// 设置对齐方式
        /// </summary>
        /// <param name="style"></param>
        /// <returns></returns>
        private static HorizontalAlignment getAlignment(string style)
        {
            switch (style)
            {
                case "center":
                    return HorizontalAlignment.Center;
                case "left":
                    return HorizontalAlignment.Left;
                case "right":
                    return HorizontalAlignment.Right;
                case "fill":
                    return HorizontalAlignment.Fill;
                case "justify":
                    return HorizontalAlignment.Justify;
                case "centerselection":
                    return HorizontalAlignment.CenterSelection;
                case "distributed":
                    return HorizontalAlignment.Distributed;
            }
            return NPOI.SS.UserModel.HorizontalAlignment.General;


        }

        #endregion