C#实现防止重复提交的代码详解

// <summary>
	/// 防重复提交,api使用
	/// </summary>
	public class LockAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// 拦截
        /// </summary>
        /// <param name="context"></param>
        /// <param name="next"></param>
        /// <returns></returns>
        public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            if (GlobalContext.SystemConfig.Debug == false)
            {
                if (OperatorProvider.Provider.GetCurrent() == null)
                {
                    context.Result = new JsonResult(new AlwaysResult { state = ResultType.error.ToString(), message = "抱歉，没有操作权限" });
                    return;
                }
                else
                {
                    string token = context.HttpContext.Request.Headers[GlobalContext.SystemConfig.TokenName].ParseToString();
                    if (string.IsNullOrWhiteSpace(token))
                    {
                        context.Result = new JsonResult(new AlwaysResult { state = ResultType.error.ToString(), message = "token不能空" });
                        return;
                    }
                    //固定加锁5秒
                    bool result = CacheHelper.SetNx(token, token, 5);
                    if (!result)
                    {
                        context.Result = new JsonResult(new AlwaysResult { state = ResultType.error.ToString(), message = "请求太频繁，请稍后" });
                        return;
                    }
                }
            }
            await next();

            sw.Stop();
        }
    }

public class HandlerLockAttribute : ActionFilterAttribute
{
	public HandlerLockAttribute()
	{
	}

	public override void OnActionExecuting(ActionExecutingContext filterContext)
	{
		if (OperatorProvider.Provider.GetCurrent() == null)
		{
			WebHelper.WriteCookie("WaterCloud_login_error", "overdue");
			//filterContext.HttpContext.Response.WriteAsync("<script>top.location.href ='" + filterContext.HttpContext.Request.PathBase + "/Home/Error?msg=408" + "';if(document.all) window.event.returnValue = false;</script>");
			OperatorProvider.Provider.EmptyCurrent("pc_").GetAwaiter().GetResult();
			filterContext.Result = new RedirectResult(filterContext.HttpContext.Request.PathBase + "/Home/Error?msg=408");
			return;
		}
		else
		{
			string token = filterContext.HttpContext.Request.Cookies["pc_" + GlobalContext.SystemConfig.TokenName];
			string cacheToken = CacheHelper.GetAsync<string>("pc_" + GlobalContext.SystemConfig.TokenName + "_" + OperatorProvider.Provider.GetCurrent().UserId + "_" + OperatorProvider.Provider.GetCurrent().LoginTime).GetAwaiter().GetResult();
			if (string.IsNullOrWhiteSpace(token))
			{
				filterContext.Result = new JsonResult(new AlwaysResult { state = ResultType.error.ToString(), message = "token不能空" });
				return;
			}
			if (string.IsNullOrWhiteSpace(cacheToken))
			{
				filterContext.Result = new JsonResult(new AlwaysResult { state = ResultType.error.ToString(), message = "token不能空" });
				return;
			}
			if (token != cacheToken)
			{
				filterContext.Result = new JsonResult(new AlwaysResult { state = ResultType.error.ToString(), message = "请求异常" });
				return;
			}
			//固定加锁5秒
			bool result = CacheHelper.SetNx(token, token, 5);
			if (!result)
			{
				filterContext.Result = new JsonResult(new AlwaysResult { state = ResultType.error.ToString(), message = "请求太频繁，请稍后" });
				return;
			}
		}
		//随机值
		base.OnActionExecuting(filterContext);
	}
}