c#随机产生颜色

有时为了满足现实的需要，我们想生成随机的较深的颜色，比如：彩色二维码，为了让手机、二维码识别设备可以正确识别，必须使用较深的颜色。
如下图所示：

      

那么，如何实现呢？以下为源码：

 //C# Code:

 using System;
 using System.Drawing;

 namespace Lgms.Net.QRCode.Codec.Util
 {
     public class ColorUtil
     {
         public static System.Drawing.Color GetRandomColor()
         {
             Random randomNum_1 = new Random(Guid.NewGuid().GetHashCode());
             System.Threading.Thread.Sleep(randomNum_1.Next());
             int int_Red = randomNum_1.Next();

             Random randomNum_2 = new Random((int)DateTime.Now.Ticks);
             int int_Green = randomNum_2.Next();

             Random randomNum_3 = new Random(Guid.NewGuid().GetHashCode());

             int int_Blue = randomNum_3.Next();
             int_Blue = (int_Red + int_Green > ) ? int_Red + int_Green -  : int_Blue;
             int_Blue = (int_Blue > ) ?  : int_Blue;

             return GetDarkerColor(System.Drawing.Color.FromArgb(int_Red, int_Green, int_Blue));
         }

         //获取加深颜色
         public static Color GetDarkerColor(Color color)
         {
             const int max = ;
             int increase = new Random(Guid.NewGuid().GetHashCode()).Next(, ); //还可以根据需要调整此处的值

             int r = Math.Abs(Math.Min(color.R - increase, max));
             int g = Math.Abs(Math.Min(color.G - increase, max));
             int b = Math.Abs(Math.Min(color.B - increase, max));

             return Color.FromArgb(r, g, b);
         }
 }

第二种方式：

 public System.Drawing.Color GetRandomColor()
 {
      Random RandomNum_First = new Random((int)DateTime.Now.Ticks);
      //  对于C#的随机数，没什么好说的
      System.Threading.Thread.Sleep(RandomNum_First.Next());
      Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks);

      //  为了在白色背景上显示，尽量生成深色
      int int_Red = RandomNum_First.Next();
      int int_Green = RandomNum_Sencond.Next();
      int int_Blue = (int_Red + int_Green > ) ?  :  - int_Red - int_Green;
      int_Blue = (int_Blue > ) ?  : int_Blue;
 
      return System.Drawing.Color.FromArgb(int_Red, int_Green, int_Blue);
 }