How to pass lambda 'include' with multiple levels in Entity Framework Core?

Question

I have a repository that gets a lambda expression for \'include\'.

public TEntity FirstOrDefault(Expression> predicate, para         


        

Answer 1

    public TEntity FirstOrDefault(Expression> predicate, params Expression>[] includePaths)
        {
DbSet = Context.Set();
    var query = includePaths.Aggregate(DbSet, (current, item) => EvaluateInclude(current, item));
             return query.Where(predicate).FirstOrDefault();
        }

    private IQueryable EvaluateInclude(IQueryable current, Expression> item)
                {
                    if (item.Body is MethodCallExpression)
                    {
                        var arguments = ((MethodCallExpression)item.Body).Arguments;
                        if (arguments.Count > 1)
                        {
                            var navigationPath = string.Empty;
                            for (var i = 0; i < arguments.Count; i++)
                            {
                                var arg = arguments[i];
                                var path = arg.ToString().Substring(arg.ToString().IndexOf('.') + 1);

                                navigationPath += (i > 0 ? "." : string.Empty) + path;
                            }
                            return current.Include(navigationPath);
                        }
                    }

                    return current.Include(item);
                }