Linq的SequenceEqual妙用

来源：互联网发布：淘宝鼠标滑动效果代码编辑：程序博客网时间：2024/04/27 17:01

SequenceEqual是对数组的比较，可以取得连续性的一段进行比较，比较也可以引入compare类定义规则。

以下是在一个byte数组中找到另外一个byte数组的全部匹配。

       /// <summary>        /// Search byte array index        /// </summary>        /// <param name="sourceBytes">source bytes</param>        /// <param name="searchBytes">search bytes</param>        /// <param name="startPos">position offset</param>        /// <returns>index</returns>        public static int SearchByteArrayIndex(byte[] sourceBytes, byte[] searchBytes, int startPos = 0)        {            int index = -1;            for (int i = startPos; i < sourceBytes.Length; i++)            {                if (sourceBytes.Skip(i).Take(searchBytes.Length).SequenceEqual(searchBytes))                {                    index = i;                    break;                }            }            return index;        }

可以运用compare，定义比较的方法

      [TestMethod()]        public void DeserializeTest()        {            Person _personA = new Person() { Name = "YanZhiweiA", Age = 10, Address = "shanghaiA" };            Person _personB = new Person() { Name = "YanZhiweiB", Age = 11, Address = "shanghaiB" };            List<Person> _expected = new List<Person>();            _expected.Add(_personA);            _expected.Add(_personB);            string _jsonString = "[{‘Name‘:‘YanZhiweiA‘,‘Age‘:10,‘Address‘:‘shanghaiA‘},{‘Name‘:‘YanZhiweiB‘,‘Age‘:11,‘Address‘:‘shanghaiB‘}]";            List<Person> _result = (List<Person>)JavaScriptSerializerHelper.Deserialize<Person>(_jsonString);            bool _actual = _expected.SequenceEqual(_result, new PersonCompare());            Assert.IsTrue(_actual);        }

        public class PersonCompare : IEqualityComparer<Person>        {            public bool Equals(Person x, Person y)            {                return (x.Age == y.Age) && (x.Address == y.Address) && (x.Name == y.Name);            }            public int GetHashCode(Person obj)            {                return obj.Name.GetHashCode();            }        }

0 0