NPOI 自定义设置单元格背景颜色[RGB格式]

一.背景介绍   

                NPOI自带的颜色有时不能满足我们要求时,我们需要自己定义背景色,而且NPOI的颜色类型是short类型,而.Net颜色类是Color类型,怎么让它们相互之间转换呢？网上有一段代码是vb的可以解决上述问题,本人把它翻译成C#的,方便大家使用

 

VB：

Private Function GetXLColour(ByVal SystemColour As System.Drawing.Color) As Short
'Lookup RGB from .NET system colour in Excel pallete - or create a new entry (get nearest if palette full). Return the XL palette index.
Dim XlPalette As HSSFPalette = xlWorkbook.GetCustomPalette()
Dim XlColour As NPOI.HSSF.Util.HSSFColor = XlPalette.FindColor(SystemColour.R, SystemColour.G, SystemColour.B)
If IsNothing(XlColour) Then
'Available colour palette entries: 65 to 32766 (0-64=standard palette; 64=auto, 32767=unspecified)
If NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE < 255 Then
If NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE < 64 Then NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE = 64
NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE += 1
XlColour = XlPalette.AddColor(SystemColour.R, SystemColour.G, SystemColour.B)
Else
XlColour = XlPalette.FindSimilarColor(SystemColour.R, SystemColour.G, SystemColour.B)
End If
Return XlColour.GetIndex()
Else
Return XlColour.GetIndex()
End If
End Function

 

C#：

private short GetXLColour(HSSFWorkbook workbook, System.Drawing.Color SystemColour)
{
short s = 0;
HSSFPalette XlPalette = workbook.GetCustomPalette();
HSSFColor XlColour = XlPalette.FindColor(SystemColour.R, SystemColour.G, SystemColour.B);
if (XlColour == null)
{
if (NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE < 255)
{
if (NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE < 64)
{
NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE = 64;
NPOI.HSSF.Record.PaletteRecord.STANDARD_PALETTE_SIZE += 1;
XlColour = XlPalette.AddColor(SystemColour.R, SystemColour.G, SystemColour.B);
}
else
{
XlColour = XlPalette.FindSimilarColor(SystemColour.R, SystemColour.G, SystemColour.B);
}

s= XlColour.GetIndex();
}

}
else
s= XlColour.GetIndex();

return s;
}

 

使用方法：

 

Color LevelOneColor = Color.FromArgb(143, 176, 229);
Color LevelTwoColor = Color.FromArgb(201, 217, 243);
Color LevelThreeColor = Color.FromArgb(231, 238, 248);
Color LevelFourColor = Color.FromArgb(232, 230, 231);
Color LevelFiveColor = Color.FromArgb(250, 252, 213);

/// <summary>
/// 分层设置单元格样式
/// </summary>
/// <param name="workbook"></param>
/// <param name="alignment"></param>
/// <param name="valingment"></param>
/// <returns></returns>
public HSSFCellStyle SetStyle(HSSFWorkbook workbook, short alignment, short valingment, int layer)
{
HSSFCellStyle style = workbook.CreateCellStyle();
style.Alignment = alignment;
style.VerticalAlignment = valingment;
style.BorderBottom = HSSFCellStyle.BORDER_THIN;
style.BorderLeft = HSSFCellStyle.BORDER_THIN;
style.BorderRight = HSSFCellStyle.BORDER_THIN;
style.BorderTop = HSSFCellStyle.BORDER_THIN;
switch (layer)
{
case 0:
style.FillForegroundColor = GetXLColour(workbook, LevelOneColor); //调用GetXLColour方法
style.FillPattern = HSSFCellStyle.ALT_BARS;
style.FillBackgroundColor = GetXLColour(workbook, LevelOneColor);
break;
case 1:
style.FillForegroundColor = GetXLColour(workbook, LevelTwoColor);
style.FillPattern = HSSFCellStyle.ALT_BARS;
style.FillBackgroundColor = GetXLColour(workbook, LevelTwoColor);
break;
case 2:
style.FillForegroundColor = GetXLColour(workbook, LevelThreeColor);
style.FillPattern = HSSFCellStyle.ALT_BARS;
style.FillBackgroundColor = GetXLColour(workbook, LevelThreeColor);
break;
case 3:
style.FillForegroundColor = GetXLColour(workbook, LevelFourColor);
style.FillPattern = HSSFCellStyle.ALT_BARS;
style.FillBackgroundColor = GetXLColour(workbook, LevelFourColor);
break;
case 4:
style.FillForegroundColor = GetXLColour(workbook, LevelFiveColor);
style.FillPattern = HSSFCellStyle.ALT_BARS;
style.FillBackgroundColor = GetXLColour(workbook, LevelFiveColor);
break;
default:
break;
}
return style;
}

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