Use-System-Net-Http

ww58

Jul 12, 2023, 10:16 AM - 1 year ago

I have a problem with connecting some system libraries. As an example, this code compiles successfully everywhere on .net 6 except wealth-lab

CODE:
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;

public class Program
{
    public static void Main()
    {
        var httpClient = new HttpClient();
        var requestUri = new Uri("https :// example.com");
        var requestData = new Dictionary<string, string>
        {
            { "Name", "John" }, { "Age", "30" }
        };
        var content = new FormUrlEncodedContent(requestData);
        HttpResponseMessage response = null;
        try
        {
            response = httpClient.PostAsync(requestUri, content).GetAwaiter().GetResult();
        }
        catch (Exception ex) { return; }

        if (response.StatusCode == HttpStatusCode.OK)
        {
            var responseContent = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
        }
    }
}

I get the following error messages:

CODE:
21: The type name 'HttpClient' could not be found in the namespace 'System.Net.Http'...
31: The type name 'FormUrlEncodedContent' could not be found in the namespace 'System.Net.Http'... 
33: The type name 'HttpResponseMessage' could not be found in the namespace 'System.Net.Http'...

I definitely have added using System.Net; and using System.Net.Http;

261

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GlitchA

( 8.20% )

Jul 12, 2023, 10:37 AM - 1 year ago

You'll need to open Tools/Assembly References and add the references below.

Also, it won't compile because WL8 can only compile classes derived from UserStrategyBase. The following will compile.

CODE:

using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Data;
using WealthLab.Indicators;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;

namespace WealthScript1 
{
    public class MyStrategy : UserStrategyBase
    {
        //create indicators and other objects here, this is executed prior to the main trading loop
        public override void Initialize(BarHistory bars)
        {
         var httpClient = new HttpClient();
         var requestUri = new Uri("https :// example.com");
         var requestData = new Dictionary<string, string>
      {
         { "Name", "John" }, { "Age", "30" }
      };
         var content = new FormUrlEncodedContent(requestData);
         HttpResponseMessage response = null;
         try
         {
            response = httpClient.PostAsync(requestUri, content).GetAwaiter().GetResult();
         }
         catch (Exception ex) { return; }

         if (response.StatusCode == HttpStatusCode.OK)
         {
            var responseContent = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();
         }
        }

        //execute the strategy rules here, this is executed once for each bar in the backtest history
        public override void Execute(BarHistory bars, int idx)
        {
            if (!HasOpenPosition(bars, PositionType.Long))
            {
                //code your buy conditions here
            }
            else
            {
                //code your sell conditions here
            }
        }

        //declare private variables below

    }
}

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