C#计算增量时间的问题

System.Environment的值。TickCount在函数执行过程中发生变化,导致deltaTime的移动速度超出预期。

尝试

private static long lastTime = System.Environment.TickCount;
private static int fps = 1;
private static int frames;

private static float deltaTime = 0.005f;

public static void Update()
{
    var currentTick = System.Environment.TickCount;
    if(currentTick  - lastTime >= 1000)
    {
        fps = frames;
        frames = 0;
        lastTime = currentTick ;
    }
    frames++;

    deltaTime = currentTick  - lastTime;

}

public static int getFPS()
{
    return fps;
}

public static float getDeltaTime()
{
    return (deltaTime / 1000.0f);
}