Why can't I assign this property of custom type? [duplicate]

I am getting the following error for this line service.job = new Job1<RealThing>();

Cannot implicitly convert type 'Program.Job1<Program.Thing1>' to 'Program.IJob<Program.IThing>'. An explicit conversion exists (are you missing a cast?)

I am struggling to get this to work and in understanding why I get this error here, but not the same error for service.List = new List();

using System;  using System.Collections.Generic;                        public class Program  {      public static void Main()      {          Service service = new Service();          IJob<RealThing> job = new Job1<RealThing>();          RealThing rt = new RealThing();                    service.job = new Job1<RealThing>();          service.List = new List<RealThing>();          service.GetSomething(rt);          //Console.WriteLine(service.GetSomething(rt));                }            public interface IThing { }      public class RealThing : IThing { }            public interface IJob<in T> where T : IThing      {          string GetSomething(T aThing);      }      public class Job1<T> : IJob<RealThing>      {          public string GetSomething(RealThing athing)          {              return "Job1.RealThing";          }      }        public class Service      {          public IJob<IThing> job { get; set; }          public IEnumerable<IThing> List { get; set; }                    public string GetSomething(IThing aThing)          {              return job.GetSomething(aThing);          }      }        }  

https://stackoverflow.com/questions/67248665/why-cant-i-assign-this-property-of-custom-type April 25, 2021 at 08:26AM