using System;

using System.Collections.Generic;

using System.Text;

public class Program

{

    public static void Main(string[] args)

        {

            var t = "Ref_Key eq guid'2cd6347d-d24f-11e1-af9a-00155d01bf09' or " +

                                "Ref_Key eq guid'848013fd-a57b-11e1-be98-00155d01bf04' or " +

                                "Ref_Key eq guid'6f407ade-cd8c-11e1-8023-00155d01bf09' or " +

                                "Ref_Key eq guid'a0754223-eb87-11e1-91ff-00155d011902' or " +

                                "Ref_Key eq guid'c5d617ae-2ce6-11e4-87f6-14dae9e15015' or " +

                                "Ref_Key eq guid'b288ef20-ee46-11e4-9259-14dae9e15015'";

​

            var ids = new List<string>(){

            "2cd6347d-d24f-11e1-af9a-00155d01bf09",

            "848013fd-a57b-11e1-be98-00155d01bf04",

            "6f407ade-cd8c-11e1-8023-00155d01bf09",

            "a0754223-eb87-11e1-91ff-00155d011902",

            "c5d617ae-2ce6-11e4-87f6-14dae9e15015",

            "b288ef20-ee46-11e4-9259-14dae9e15015"

        };

​

​

            //var a = new StringBuilder("Ref_Key eq guid");

​

            //foreach (var item in ids)

            //{

            //  a.Append(" " + $"'{item}'" + " or Ref_Key eq guid");

            //}

​

            //a.Length -= 19;

​

            var count = ids.Count;

            var filter = new StringBuilder();

​

                for (int i = 0; i < count; i++)

                {

                if (i == count - 1)

                {

                    filter.Append(" Ref_Key eq guid" + $"'{ids[i]}'");

                }

                else

                    filter.Append(" Ref_Key eq guid" + $"'{ids[i]}'" + " or");

                }

​

            Console.WriteLine(filter);

​

            Console.WriteLine(t);

​

            Console.ReadLine();

        }

}