ambda表示式查詢沒有IN這個方法，可以變通一下，in查詢的陣列是否包含在對映物件裡面的集合裡

直接貼程式碼吧，一看就懂了

class Program
    {
        static void Main(string[] args)
        {
            List<Model> strList = new List<Model>()
            {
                new Model(){Id=1,Name = "張三"},
                new Model(){Id=2
 
,Name = "李四"},
                new Model(){Id=3,Name = "王五"},
                new Model(){Id=4,Name = "趙六"},
            };

            List<int> whereList = new List<int>(){1,3};

            var list = strList.Where(x => whereList.Contains(x.Id));

            foreach (var
 
 model in list)
            {
                Console.WriteLine("Id:"+model.Id+"Name:"+model.Name);
            }

            Console.ReadKey();
        }
    }

    public class Model
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }

執行結果：