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(1));
            int int_Red = randomNum_1.Next(255);

            Random randomNum_2 = new Random((int)DateTime.Now.Ticks);
            int int_Green = randomNum_2.Next(255);

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

            int int_Blue = randomNum_3.Next(255);
            int_Blue = (int_Red + int_Green > 380) ? int_Red + int_Green - 380 : int_Blue;
            int_Blue = (int_Blue > 255) ? 255 : 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 = 255;
            int increase = new Random(Guid.NewGuid().GetHashCode()).Next(30, 255); //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(50));
     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(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;
 
     return System.Drawing.Color.FromArgb(int_Red, int_Green, int_Blue);
}