c#如何获取excel单元格的RGB颜色

这段时间一直在做office的工作。前2天获取单元格的颜色的问题一直没搞明白。

开始我想用的就是Npoi.主要前一部分的工作都是用Npoi完成的

row.GetCell(j).CellStyle.FillBackgroundColorColor 获取IColor接口。通过IColor的RGB属性获取可是经过大量用例测试这里获取的rgb并不准确只有部分颜色对的上。

如图

后来我甚至问了npoi的创始人也没有给我一个明确的回复。

我自己猜测因为row.GetCell(j).CellStyle.FillBackgroundColor 是short类型npoi是不是只支持他枚举的颜色

后来经过翻阅官网的demo发现npoi可以通过rgb设置颜色

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/* ================================================================
 * Author: Tony Qu
 * Author's email: tonyqus (at) gmail.com
 * NPOI HomePage: http://www.codeplex.com/npoi
 * Contributors:
 *
 * ==============================================================*/

using System;
using System.Collections.Generic;
using System.Text;

using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.HPSF;
using NPOI.POIFS.FileSystem;
using NPOI.SS.UserModel;
using NPOI.HSSF.Util;

namespace CustomColorInXls
{
    class Program
    {
        static void Main(string[] args)
        {
            InitializeWorkbook();

            HSSFPalette palette = workbook.GetCustomPalette();
            palette.SetColorAtIndex(HSSFColor.PINK.index, (byte)255, (byte)1, (byte)222);
           //HSSFColor  palette.GetColor()
            //HSSFColor myColor = palette.AddColor((byte)253, (byte)0, (byte)0);

            ISheet sheet1 = workbook.CreateSheet("Sheet1");
            ICellStyle style1 = workbook.CreateCellStyle();
            style1.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.PINK.index;
            style1.FillPattern = FillPatternType.SOLID_FOREGROUND;
            sheet1.CreateRow(0).CreateCell(0).CellStyle = style1;
            short c = sheet1.GetRow(0).Cells[0].CellStyle.FillForegroundColor;
            short []sh = palette.GetColor(c).GetTriplet();

            WriteToFile();
        }

        static HSSFWorkbook workbook;

        static void WriteToFile()
        {
            //Write the stream data of workbook to the root directory
            FileStream file = new FileStream(@"test.xls", FileMode.Create);
            workbook.Write(file);
            file.Close();
        }

        static void InitializeWorkbook()
        {
            workbook = new HSSFWorkbook();

            ////create a entry of DocumentSummaryInformation
            DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
            dsi.Company = "NPOI Team";
            workbook.DocumentSummaryInformation = dsi;

            ////create a entry of SummaryInformation
            SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
            si.Subject = "NPOI SDK Example";
            workbook.SummaryInformation = si;
        }
    }
}

而且palettle可以通过public HSSFColor GetColor(short index);方法将short转化为HSSFColor而通过HSSFColor类的public virtual short[] GetTriplet();方法可以获取rgb.

但是这里存在2个问题

1.

palette.SetColorAtIndex(HSSFColor.PINK.index, (byte)255, (byte)1, (byte)222);这里是设置的时候固定的设置。而人工操作能否有这种固定的设置。

2.

支持excel2007的XSSFWorkbook并没有GetCustomPalette方法。而通过反编译器我也没找到能获取Palette的类似的类

后通过官网excel2003和excel2007的demo如下code

2003

2007

npoi to excel2007无法获取单元格rgb的颜色 如果颜色不一样会向npoi支持的short转化

实在没法了。只有祭出com组件了。

代码如下:

Microsoft.Office.Interop.Excel.Application application = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook workbook = null;
Microsoft.Office.Interop.Excel.Worksheet worksheet = null;
//打开文件，n.FullPath是文件路径
workbook = application.Application.Workbooks.Open(copyPath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
Microsoft.Office.Interop.Excel.Range range = null;// 创建一个空的单元格对象
range = worksheet.get_Range(worksheet.Cells[rowNum + 1, ColumnNum + 1], worksheet.Cells[rowNum + 1, ColumnNum + 1]);
if (range.Value2 != null)
{
    string content = range.Value2.ToString();
}
string color = range.Interior.Color.ToString();
 Common com = new Common();
Color col = com.RGB(int.Parse(color));
return new byte[3] { col.R, col.G, col.B };

RGB方法如下:

 public Color RGB(int color)
        {
            int r = 0xFF & color;
            int g = 0xFF00 & color;
            g >>= 8;
            int b = 0xFF0000 & color;
            b >>= 16;
            return Color.FromArgb(r, g, b);
        }

string color的这个color的范围是整个颜色的范围OK问题解决。可是动用了com组件，如果大家有更好的办法欢迎留言。