产生随机颜色

 1    1. public string GetRandomColor()  
 2    2. {  
 3    3.     Random RandomNum_First = new Random((int)DateTime.Now.Ticks);  
 4    4.     //  对于C#的随机数，没什么好说的   
 5    5.     System.Threading.Thread.Sleep(RandomNum_First.Next(50));  
 6    6.     Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);  
 7    7.   
 8    8.     //  为了在白色背景上显示，尽量生成深色   
 9    9.     int int_Red = RandomNum_First.Next(256);  
10   10.     int int_Green = RandomNum_Sencond.Next(256);  
11   11.     int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green;  
12   12.     int_Blue = (int_Blue > 255) ? 255 : int_Blue;  
13   13.   
14   14.     return Color.FromArgb(int_Red, int_Green, int_Blue).Name;  
15   15. }