C# i=0；我有没有办法知道卡车经过读卡器时是来还是走？）你有没有办法知道卡车经过读卡器时是来还是走？） private void tmr_Tick(object sender, EventArgs e) { int maxTime =

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i=0；我有没有办法知道卡车经过读卡器时是来还是走？）你有没有办法知道卡车经过读卡器时是来还是走？）

private void tmr_Tick(object sender, EventArgs e)
    {
        int maxTime = int.Parse(AppSettings.GetAppSetting("MaxTime"));
        List<string> _assets = new List<string>();
        List<ReadPoint> _assetReads = new List<ReadPoint>();

        //Get the list of assets to process
        DataSet ds = du.ExecuteTextCommand("SELECT DISTINCT AssetId FROM " + 
             "(SELECT a.TagId, a.AssetId, a.Description, rp.Comments, DateScanned " + 
             "FROM AssetsReads ar JOIN Assets a on ar.AssetTagID = a.AssetTagID " + 
             "JOIN ReadPointLocations rp on " + 
             "ar.ReadPointLocationsID = rp.ReadPointLocationsID) AS AssetResult " + 
             "ORDER BY AssetId");
        if (ds != null && ds.Tables[0].Rows.Count > 0)
        {
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                _assets.Add(dr["AssetId"].ToString());
            }
        }

        //Loop through and process the assets
        foreach (string asset in _assets)
        {
            ds = du.ExecuteTextCommand("SELECT a.TagId, a.AssetId, a.Description, " + 
                 "rp.ReadPointLocationId, rp.Comments, DateScanned " + 
                 "FROM AssetsReads ar JOIN Assets a on ar.AssetTagID = a.AssetTagID " + 
                 "JOIN ReadPointLocations rp on " + 
                 "ar.ReadPointLocationsID = rp.ReadPointLocationsID " + 
                 "WHERE a.AssetID = '" + asset + "' ORDER BY DateScanned");
            if (ds != null && ds.Tables[0].Rows.Count > 0)
            {
                _assetReads.Clear();

                foreach (DataRow dr in ds.Tables[0].Rows)
                {
                    ReadPoint ar = new ReadPoint();
                    ar.ReadPointLocationId = int.Parse(dr["ReadPointLocationId"].ToString());
                    ar.ReadpointName = dr["Comments"].ToString();
                    ar.DateScanned = DateTime.Parse(dr["DateScanned"].ToString());
                    _assetReads.Add(ar);
                }

                //Check to see if the asset has been seen in the last (MaxTime) minutes
                if (DateTime.Parse(_assetReads[0].DateScanned.ToString()) < DateTime.Now)
                {
                    ///////////////////////
                    //Send notification
                    ///////////////////////
                    continue;
                }

                //Determine the correct route to follow
                Route currentRoute = null;
                foreach (Route rt in _routes)
                {
                    foreach (ReadPoint rp in rt.ReadPoints)
                    {
                        if (_assetReads[0].ReadPointLocationId == rp.ReadPointLocationId)
                        {
                            currentRoute = rt;
                            break;
                        }
                    }

                    if (currentRoute != null)
                        break;
                }

                //Check if the route was correctly followed
                if (currentRoute != null)
                {
                    //////////////////////////////
                    //This is where I'm stuck
                    //////////////////////////////
                }
            }
        }
    }

//Check if the route was correctly followed
if (currentRoute != null)
{
    var gatesInOrder = 0;
    for(var i=0; i<_assetReads.Length; i++)
    {
       if(_assetReads[i].ReadPointLocationId == currentRoute[gatesInOrder])
          //gate crossed in order; increment to next gate
          gatesInOrder++;           
    }
    //if we didn't get to the end of the route, send a notification
    if(gatesInOrder != currentRoute.Length)
    {
       ///////////////////////
       //Send notification
       ///////////////////////
    }
}