用到某處要使用自定義顏色填充圖像，貌似Graphics.FillRectangle方法只能用Brush來填充。但是常規Brush都是Brushes定義好的Brush，怎么辦呢？

GOOGLE了下有兩種方法：
一、用新SolidBrush填充
 

public void FillByColor(Rectangle rect,Color c,Graphics G){    G.FillRectangle(new SolidBrush(c), rect);}

參考文章：《如何：創建線性漸變》

二、用API實現指定顏色填充一個閉合區域(未測試)
用API實現指定顏色填充
using System.Runtime.InteropServices;[DllImport("gdi32.dll")]public static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);[DllImport("gdi32.dll")]public static extern IntPtr CreateSolidBrush(int crColor);[DllImport("gdi32.dll")]public static extern bool ExtFloodFill(IntPtr hdc, int nXStart, int nYStart, int crColor, uint fuFillType);[DllImport("gdi32.dll")]public static extern bool DeleteObject(IntPtr hObject);[DllImport("gdi32.dll")]public static extern int GetPixel(IntPtr hdc, int x, int y);public static uint FLOODFILLBORDER = 0;public static uint FLOODFILLSURFACE = 1;PRivate void button1_Click(object sender, EventArgs e){    Graphics vGraphics = Graphics.FromHwnd(Handle);    vGraphics.DrawRectangle(Pens.Blue, new Rectangle(0, 0, 300, 300));    vGraphics.DrawRectangle(Pens.Blue, new Rectangle(50, 70, 300, 300));    IntPtr vDC = vGraphics.GetHdc();    IntPtr vBrush = CreateSolidBrush(ColorTranslator.ToWin32(Color.Red));    IntPtr vPreviouseBrush = SelectObject(vDC, vBrush);    ExtFloodFill(vDC, 10, 10, GetPixel(vDC, 10, 10), FLOODFILLSURFACE);    SelectObject(vDC, vPreviouseBrush);    DeleteObject(vBrush);    vGraphics.ReleaseHdc(vDC);}
 

參考文章：http://www.csharpwin.com/csharpspace/9115r3566.shtml
 

（本文來源：http://m.survivalescaperooms.com/allanswolf/archive/2010/04/22/1718217.html）