C# IEqualityComparer 去重

1、去除list里某重复字段值的数据（相当于group by）

    public class CorrController
    {
       //方法
        public void DoGet()
        {
            List<test11> list_test = new List<test11>();
            list_test.Add(new test11()
            {
                m = 1,
                v = "one"
            });
            list_test.Add(new test11()
            {
                m = 2,
                v = "two"
            });
            list_test.Add(new test11()
            {
                m = 3,
                v = "three"
            });
            list_test.Add(new test11()
            {
                m = 4,
                v = "fornt"
            });
            list_test.Add(new test11()
            {
                m = 4,
                v = "fornt"
            });
            list_test.Add(new test11()
            {
                m = 3,
                v = "fornt"
            });
            var ss = list_test.Distinct(new Comparint());//这里调用
        }

    }

    //model
    public class test11
    {
        public int m { get; set; }
        public string v { get; set; }
    }
    //
    public class Comparint : IEqualityComparer<test11>
    {
        public bool Equals(test11 x, test11 y)
        {
            if (x == null && y == null)
                return false;
            return x.m == y.m;
        }

        public int GetHashCode(test11 obj)
        {
            return obj.ToString().GetHashCode();
        }
    }

执行Distinct前有6条数据：

执行Distinct后有4条数据：