The type or namespace name 'ICondition'/'IContactSearchQueryFactory' could not be found, despite references to appropriate dlls

Question

In this Sitecore article, there is a code sample implements ICondition and IContactSearchQueryFactory. We believe that this code will help us to add custom rules to the Sitecore List Manager. However, when we try to implement this class, we get the errors "The type or namespace name 'ICondition' could not be found." and "The type or namespace name 'IContactSearchQueryFactory' could not be found."

We have added references to the dlls Sitecore.XConnect.Segmentation.Predicates.dll and Sitecore.Framework.Rules.dll (per this documentation for 9.1 - we're on Sitecore 10.2) from our sitecore instance, and they're referenced via usings in the file where we're trying to implement the class, but the error persists.

I'm wondering if there is a possibility that those are in a different DLL, otherwise I'm stumped as to why they wouldn't be found. Our code is exactly the same as the example in that sitecore article (see below). How can we resolve those two interfaces?

using System;
using System.Linq.Expressions;
using Sitecore.Framework.Rules;
using Sitecore.XConnect;
using Sitecore.XConnect.Segmentation.Predicates;
using Sitecore.XConnect.Collection.Model;
using System.Linq;

namespace Documentation.Examples
{
    public class PreferredCinemaMatches : ICondition, IContactSearchQueryFactory
    {
        //implementation
    }
}

Answer 1

I tried it on my system and added all the references given in your question and in the article that you are following. And it works for me without any errors.

Here is my class.

using System;
using System.Linq.Expressions;
using Sitecore.Framework.Rules;
using Sitecore.XConnect;
using Sitecore.XConnect.Segmentation.Predicates;

namespace WebApplication1
{
    public class PreferredCinemaMatches : ICondition, IContactSearchQueryFactory
    {
        public Expression<Func<Contact, bool>> CreateContactSearchQuery(IContactSearchQueryContext context)
        {
            throw new NotImplementedException();
        }

        public bool Evaluate(IRuleExecutionContext context)
        {
            throw new NotImplementedException();
        }
    }
}

And here are the reference that I have for my project.

You can verify all the references for your solution. Maybe you are missing something.

Hope it helps.

Answer 2

Seems that you need to add a reference to Sitecore.Framework.Rules.

Credit: https://sitecorewithraman.wordpress.com/2021/05/02/custom-rules-segmented-list-marketing-automation/

Just tested and this keeps the compiler happy:

using Sitecore.XConnect;
using Sitecore.XConnect.Segmentation.Predicates;
using Sitecore.Framework.Rules;
using System.Linq.Expressions;
using System;

namespace Documentation.Examples
{

    public class PreferredCinemaMatches : ICondition, IContactSearchQueryFactory
    {
        public Expression<Func<Contact, bool>> CreateContactSearchQuery(IContactSearchQueryContext context)
        {
            throw new NotImplementedException();
        }

        public bool Evaluate(IRuleExecutionContext context)
        {
            throw new NotImplementedException();
        }
    }
}

Answer 3

I do believe adding all of the DLLs listed in the answer by Sumit would work to troubleshoot this issue, however, I'm putting my own answer here with a list of the DLLs I've added to get everything working, just in case. In order to resolve this issue, I needed to add references to a variety of DLLs other than Sitecore.Framework.Rules.dll and Sitecore.XConnect.Segmentation.Predicates.dll