C# 隨機顏色的方法

         public string GetRandomColor()
        {

            Random RandomNum_First = new Random((int)DateTime.Now.Ticks);

            //  對於C#的隨機數，沒什么好說的

            System.Threading.Thread.Sleep(RandomNum_First.Next(50));

            Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);

 

            //  為了在白色背景上顯示，盡量生成深色

            int int_Red = RandomNum_First.Next(256);

            int int_Green = RandomNum_Sencond.Next(256);

            int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green;

            int_Blue = (int_Blue > 255) ? 255 : int_Blue;
            Color color = Color.FromArgb(int_Red, int_Green, int_Blue);
            string strColor = "#" + Convert.ToString(color.ToArgb(), 16).PadLeft(8, '0').Substring(2, 6);
            return strColor;

        }