public class GradLeds
    {
        Ws28xx _leds;
        public GradLeds(Ws28xx ws) => _leds = ws;

        public void Run(Color start, Color end, int steps = 120, int delay_ms = 30)
        {
            if (steps <= 0)
                throw new Exception("steps 不能小于/等于0");
            if (delay_ms <= 0)
                throw new Exception("延时必须大于0");

            // 计算RGB的差值，不论正负
            float dR = (float)end.R - start.R;
            float dG = (float)end.G - start.G;
            float dB = (float)end.B - start.B;
            // 计算每一个步长（step）要增长的值
            float ir = dR / steps;
            float ig = dG / steps;
            float ib = dB / steps;

            // 通过宽度获取灯珠数
            int ledNum = _leds.Image.Width;
            for (var a = 0; a <= steps; a++)
            {
                // 如果运行状态为false，退出循环
                if(AppContext.TryGetSwitch("running",out bool b) && !b)
                {
                    break;
                }
                Color tc = Color.FromArgb(
                        (int)(start.R + a * ir),
                        (int)(start.G + a * ig),
                        (int)(start.B + a * ib)
                );
                // 填充所有灯珠
                for (var n = 0; n < ledNum; n++)
                {
                    _leds.Image.SetPixel(n, 0, tc);
                }
                _leds.Update();
                // 延时
                Thread.Sleep(delay_ms);
            }
        }
    }

using System.Device.Spi;
using Iot.Device.Ws28xx;
using Grdtest;
using System.Drawing;

// 初始化SPI总线
SpiConnectionSettings settings = new(0)
{
    Mode = SpiMode.Mode0,
    DataBitLength = 8,
    ClockFrequency = 2400_000
};
using SpiDevice device = SpiDevice.Create(settings);

// WS28XX，30个灯珠
Ws28xx ws = new Ws2812b(device, 30);
GradLeds grdled = new(ws);

int steps = 90; //90个循环
int delay = 25; //延时（毫秒）
// 设置运行状态
AppContext.SetSwitch("running", true);

// 按Ctrl+C时程序要退出，处理一下
Console.CancelKeyPress += async (_, e) =>
{
    e.Cancel = true;    //阻上程序马上退出
    // 关闭开关，表示程序不再运行了
    AppContext.SetSwitch("running", false);
    await Task.Delay(150);  //保险一点，等一会儿
    e.Cancel = false;   //告诉系统，可以退出了
};

// 主循环
while (AppContext.TryGetSwitch("running", out bool b) && b)
{
    // 从红变蓝
    grdled.Run(Color.Red, Color.Blue, steps, delay);
    // 从蓝变黄
    grdled.Run(Color.Blue, Color.Yellow, steps, delay);
    // 从黄变深粉色
    grdled.Run(Color.Yellow, Color.DeepPink, steps, delay);
    // 从深粉色变白色
    grdled.Run(Color.DeepPink, Color.White, steps, delay);
    // 从白变回红
    grdled.Run(Color.White, Color.Red, steps, delay);
}

// 黑灯收工
ws.Image.Clear(Color.Black);
ws.Update();

ws.Image.Clear(Color.Black);
ws.Update();