Extensions for automapper

AutomapperExtensions.cs

public static class AutomapperExtensions
  {
    public static IMappingExpression<TSource, TDestination> Ignore<TSource, TDestination>(
      this IMappingExpression<TSource, TDestination> map,
      Expression<Func<TDestination, object>> selector)
    {
      map.ForMember(selector, options => options.Ignore());
      return map;
    }
    public static IMappingExpression<TSource, TDestination> Define<TSource, TDestination>(
      this IMappingExpression<TSource, TDestination> map,
      Expression<Func<TDestination, object>> selector1,
      Expression<Func<TSource, object>> selector2)
    {
      return map.ForMember(selector1, options => options.MapFrom(selector2));
    }
    
    public static IMappingExpression<TSource, TDestination> Define<TSource, TDestination, TType>(
      this IMappingExpression<TSource, TDestination> map,
      Expression<Func<TDestination, TType?>> selector1,
      Expression<Func<TSource, TType>> selector2) where TType : struct
    {
      var expr = selector2.Compile(); 
      return map.ForMember(selector1, x => x.MapFrom(y => (TType?)expr(y)));
    }
  }