using System;

using System.Collections.Generic;

using System.Linq;

using System.Linq.Dynamic.Core;

​

public record DataRecord(List<Dictionary<string, string>> ListOfDictionaries, Dictionary<string, string> FirstDict, List<string> ListOfKeys);

public class Program

{

    public static void Main()

    {

        var dataList = new List<Dictionary<string, string>>

        {

            new()

            {

                ["test"] = "value1"

            },

            new()

            {

                ["otherKey"] = "value2"

            },

            new()

            {

                ["test"] = "value3"

            },

        };

        var data = new DataRecord(dataList, dataList[0], dataList.SelectMany(d => d.Keys).ToList());

        TestQuery(data, "FirstDict.ContainsKey(\"test\")"); // True

        TestQuery(data, "ListOfKeys.Any(x => x.Contains(\"test\"))"); // True

        TestQuery(data, "ListOfDictionaries.Any(it.ContainsKey(\"test\"))"); // True

        TestQuery(data, "ListOfDictionaries.Any(ContainsKey(\"test\"))"); // True

        TestQuery(data, "ListOfDictionaries.Any(x => x.ContainsKey(\"test\"))"); // ERROR!

    }

​

    private static void TestQuery(DataRecord data, string expression)

    {

        var queryableDataRecord = new[]

        {

            data

        }.AsQueryable();

        try

        {

            var result = queryableDataRecord.Any(expression);

            System.Console.WriteLine($"{result}: {expression}");

        }

        catch (Exception e)

        {

            System.Console.WriteLine($"ERROR: {expression} >> [{e}]");

        }

    }

}