**NT** Error on getting/setting property

[benoirat]

Hi,

I have just written this very simple strategy, which is just supposed to print the state of bid-ask prices for input instruments. Unfortunately I am getting the following error, that I do not understand at all.

**NT** Error on getting/setting property 'Instruments' for strategy 'MyCustomStrategy/37ac2ca530ae4e1d9fd316ad4cf0829e': Object of type 'NinjaTrader.Cbi.Instrument[]' cannot be converted to type 'System.String'.

My code is quite simple, 'Instruments' is a string, I do not know why NT is complaining about 'Cbi.Instrument'.....

namespace NinjaTrader.Strategy
{
    [Description("...")]
    public class MyCustomStrategy : Strategy
    {
        #region Variables
        private string instruments = "";
		private string[] instruemntsArray;
		private Dictionary<string, double> bidDict = new Dictionary<string, double>();
		private Dictionary<string, double> askDict = new Dictionary<string, double>();
		private List<string> barDesc = new List<string>();
		private DateTime currentTime = new DateTime();
        #endregion

        protected override void Initialize()
        {
            CalculateOnBarClose = true;
			instruemntsArray = instruments.Split(',');
			
			foreach (string instr in instruemntsArray)
			{
				Add(instr, BarsPeriod.Id, 1, MarketDataType.Bid);
				Add(instr, BarsPeriod.Id, 1, MarketDataType.Ask);
				bidDict.Add(instr, 0);
				askDict.Add(instr, 0);
				barDesc.Add("Bid");
				barDesc.Add("Ask");
			}
        }

        protected override void OnBarUpdate()
        {
			if (Historical) { return; }
			
			#region print out data if new timestamp
			if (currentTime != Time[0])
			{
				string thisPrint = currentTime.ToString();
				foreach (string instr in instruemntsArray)
				{
					thisPrint += "#" + bidDict[instr] + "#" + askDict[instr];
				}
				Print(thisPrint);
				currentTime = Time[0];
			}
			#endregion
			
			#region assign new price
			switch (barDesc[BarsInProgress])
			{
				case "Bid":
					bidDict[Instrument.FullName] = Close[0];
					break;
				case "Ask":
					askDict[Instrument.FullName] = Close[0];
					break;
				default:
					break;
			}
			#endregion
        }

        #region Properties
        [Description("")]
        [GridCategory("Parameters")]
        public string Instruments
        {
            get { return instruments; }
            set { instruments =value; }
		}
		#endregion
	}
}

[NinjaTrader_ChelseaB]

Hello benoirat,

Thanks for writing in.

Instruments is an already existing class created by NinjaTrader as StrategyBase.Instruments. You will not be able to set this variable.

I recommend you rename the variable in both the variables region and the properties region.


Please let me know if this does not resolve your inquiry.