过滤泛型中重复的数据

1.先为要过滤的数据做个实体类：User

 

public class User
    {
        public User(int id, string name)
        {
            Id = id;
            Name = name;
        }

       public int Id
        {
            get;
            set;
        }

       public string Name
        {
            get;
            set;
        }
    }

2.再自定义一个User比较类（实现IEqualityComparer<T>接口）：RemoveRepeatList

 

public class RemoveRepeatList : IEqualityComparer<User>
    {
        public bool Equals(User x, User y)
        {
            if (x.Id == y.Id && x.Name == y.Name)
                return true;
            else
                return false;
        }
        public int GetHashCode(User obj)
        {
            return 0;
        }
    }
    public class User
    {
        public User(int id, string name)
        {
            Id = id;
            Name = name;
        }

       public int Id
        {
            get;
            set;
        }

       public string Name
        {
            get;
            set;
        }
    }

3.调用测试用例：

            List<User> list = new List<User>();
            list.Add(new User(1, "张三"));
            list.Add(new User(1, "李三"));
            list.Add(new User(1, "小伟"));
            list.Add(new User(1, "李三"));
            list.Add(new User(2, "李四"));
            list.Add(new User(2, "李武"));
            var query = list.Distinct(new RemoveRepeatList());
            foreach (var item in query)
            {
                Response.Write("键:" + item.Id + " " + "值:" + item.Name + "<br/>");
            }