WPF FPS类

public class FPSBase
{
    public static void Run()
    {
        CompositionTarget.Rendering += CompositionTarget_Rendering;
    }

    public static TimeSpan RunTime { get; private set; }
    public static int FPS { get; private set; }
    static int fps = 0;
    public static TimeSpan PreSTime { get; private set; }
    public static TimeSpan PreLogicTime { get; private set; }

    public static double Logicalnterval { get; set; } = 16d;

    private static void CompositionTarget_Rendering(object sender, EventArgs e)
    {
        RunTime = (e as RenderingEventArgs).RenderingTime;
        var span = (RunTime - PreSTime).TotalSeconds;
        if (span >= 1d)
        {
            PreSTime = RunTime;
            FPS = fps;
            fps = 0;
        }
        else
            fps++;
        if ((RunTime - PreLogicTime).TotalMilliseconds > Logicalnterval)
        {
            PreLogicTime = RunTime;
            OnLogicFrame();
        }
        OnRenderFrame();
    }

    static EventHandlerList Events = new EventHandlerList();
    static readonly object LogicFrameEventObj = new object();
    static readonly object RenderFrameEventObj = new object();
    public static event EventHandler LogicFrameEvent { add => Events.AddHandler(LogicFrameEventObj, value); remove => Events.RemoveHandler(LogicFrameEventObj, value); }
    public static event EventHandler RenderFrameEvent { add => Events.AddHandler(RenderFrameEventObj, value); remove => Events.RemoveHandler(RenderFrameEventObj, value); }
    private static void OnLogicFrame()
    {
        (Events[LogicFrameEventObj] as EventHandler)?.Invoke(null, EventArgs.Empty);
    }

    static void OnRenderFrame()
    {
        (Events[RenderFrameEventObj] as EventHandler)?.Invoke(null, EventArgs.Empty);
    }
}