IHost (Wealth-Lab Framework)

The IHost interface is used to communicate various aspects of the WL8 environment to Strategies and WL8 Extensions. You can always get the singleton instance of the IHost interface by accessing WLHost.Instance.

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript123
{
	public class MyStrategy : UserStrategyBase
	{
		public override void Initialize(BarHistory bars)
		{
			WriteToDebugLog("Wealth-Lab 8 is installed in: " + WLHost.Instance.AppFolder);
		}

		public override void Execute(BarHistory bars, int idx)
		{

		}

	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace WealthScript55
{
	public class MyStrategy : UserStrategyBase
	{
		public override void BacktestBegin()
		{
			//create a file with the names of the DataSets in the DataFolder
			string filepath = Path.Combine(WLHost.Instance.DataFolder, "MyDataSetsExample.txt");

			List<string> datasetnames = new List<String>();
			foreach (DataSet ds in WLHost.Instance.DataSets)
			{
				datasetnames.Add(ds.Name);
			}

			//save it to the file
			File.WriteAllLines(filepath, datasetnames);

			//Launch File Explorer: for this to work, open Tools > Assembly References and put checkmarks
			//next to 1. System.ComponentModel.Primitives, and, 2. System.Diagnostics.Process
			//System.Diagnostics.Process.Start("explorer.exe", WLHost.Instance.DataFolder);
		}

		//execute the strategy rules here, this is executed once for each bar in the backtest history
		public override void Execute(BarHistory bars, int idx)
		{
		}
	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript123
{
	public class MyStrategy : UserStrategyBase
	{
		public override void BacktestBegin()
		{
			//list the DataSets
			foreach (DataSet ds in WLHost.Instance.DataSets)
			{
				WriteToDebugLog(ds.Name);
			}
		}

		public override void Execute(BarHistory bars, int idx)
		{

		}

	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript123
{
	public class MyStrategy : UserStrategyBase
	{
		public override void Initialize(BarHistory bars)
		{
			string expertOrnovice = WLHost.Instance.ExpertMode ? "n expert" : " novice";
			WLHost.Instance.DisplayMessage("I am a" + expertOrnovice);
		}

		public override void Execute(BarHistory bars, int idx)
		{

		}

	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace WealthScript55
{
	public class MyStrategy : UserStrategyBase
	{
		public override void BacktestBegin()
		{
			List<string> selectedEvents = new List<String>();
			foreach (string evnte in WLHost.Instance.EventsSelected)
			{
				WriteToDebugLog(evnte);
			}

		}

		//execute the strategy rules here, this is executed once for each bar in the backtest history
		public override void Execute(BarHistory bars, int idx)
		{
		}


	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript123
{
	public class MyStrategy : UserStrategyBase
	{
		public override void Initialize(BarHistory bars)
		{
			string expertOrnovice = WLHost.Instance.ExpertMode ? "n expert" : " novice";
			WLHost.Instance.DisplayMessage("I am a" + expertOrnovice);
		}

		public override void Execute(BarHistory bars, int idx)
		{

		}

	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript55
{
	public class MyStrategy : UserStrategyBase
	{
		public override void BacktestBegin()
		{
			DataSet ds = WLHost.Instance.FindDataSet("Nasdaq 100");
			foreach (string sym in ds.Symbols)
			{
				WriteToDebugLog(sym);
			}
		}

		//execute the strategy rules here, this is executed once for each bar in the backtest history
		public override void Execute(BarHistory bars, int idx)
		{
		}


	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript123
{
	public class MyStrategy : UserStrategyBase
	{
		public override void Initialize(BarHistory bars)
		{
			//get the market by symbol
			MarketDetails md = WLHost.Instance.FindMarket(bars.Symbol);
			WriteToDebugLog(string.Format("FindMarket for {0} is {1}.", bars.Symbol, md.Name));

			//get the market using bars (should be the same)
			WriteToDebugLog(string.Format("FindMarket for bars is {0}.", bars.Market.Name));
		}

		public override void Execute(BarHistory bars, int idx)
		{

		}

	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript123
{
	public class MyStrategy : UserStrategyBase
	{
		public override void Initialize(BarHistory bars)
		{
			WriteToDebugLog("Hello " + WLHost.Instance.LocalUserName + "!");
		}

		public override void Execute(BarHistory bars, int idx)
		{

		}

	}
}

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Drawing;
using System.Collections.Generic;

namespace WealthScript123
{
	public class MyStrategy : UserStrategyBase
	{
		public override void Initialize(BarHistory bars)
		{
			WLHost.Instance.DisplayMessage("Running Build " + WLHost.Instance.WLBuildNumber);
		}

		public override void Execute(BarHistory bars, int idx)
		{
		}
	}
}