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[C#]Array添加扩展

2019-11-14 16:31:39
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众所周知,Array 一旦定义好,譬如四个长度,当需要再往里面添加元素的时候,需要Array.Resize一下才可以,为了提高代码复用,所以索性封装下,方便使用,代码如下:

        /// <summary>        /// Array添加        /// </summary>        /// <typeparam name="T">泛型</typeparam>        /// <param name="array">Array</param>        /// <param name="item">需要添加项</param>        /// <returns>返回新的Array</returns>        public static T[] Add<T>(this T[] array, T item)        {            int _count = array.Length;            Array.Resize<T>(ref array, _count + 1);            array[_count] = item;            return array;        }        /// <summary>        ///  Array添加        /// </summary>        /// <typeparam name="T">泛型</typeparam>        /// <param name="sourceArray">Array</param>        /// <param name="addArray">Array</param>        /// <returns>返回新的Array</returns>        public static T[] AddRange<T>(this T[] sourceArray, T[] addArray)        {            int _count = sourceArray.Length;            int _addCount = addArray.Length;            Array.Resize<T>(ref sourceArray, _count + _addCount);            //foreach (T t in addArray)            //{            //    sourceArray[_count] = t;            //    _count++;            //}            addArray.CopyTo(sourceArray, _count);            return sourceArray;        }

测试代码:

        [TestMethod()]        public void AddTest()        {            int[] _source = new int[3] { 1, 2, 3 };            int[] _expected = new int[4] { 1, 2, 3, 4 };            _source = _source.Add(4);            CollectionAssert.AreEqual(_source, _expected);        }        [TestMethod()]        public void AddRangeTest()        {            int[] _source = new int[3] { 1, 2, 3 };            int[] _expected = new int[6] { 1, 2, 3, 4, 5, 6 };            _source = _source.AddRange(new int[3] { 4, 5, 6 });            CollectionAssert.AreEqual(_source, _expected);        }

测试结果:

image

代码逻辑很简单,无需说明,只是方面后续使用而已,这是基于.NET 2.0的写法,大家都知道,在.NET 3.0+有了LINQ出现,实现此效果更为简单方面,代码如下:

       /// <summary>        /// Array添加        /// </summary>        /// <typeparam name="T">泛型</typeparam>        /// <param name="array">Array</param>        /// <param name="item">需要添加项</param>        /// <returns>返回新的Array</returns>        public static T[] Add<T>(this T[] array, T item)        {            array = 

array.Concat

<T>(new T[1] { item }).ToArray();            return array;        }        /// <summary>        ///  Array添加        /// </summary>        /// <typeparam name="T">泛型</typeparam>        /// <param name="sourceArray">Array</param>        /// <param name="addArray">Array</param>        /// <returns>返回新的Array</returns>        public static T[] AddRange<T>(this T[] sourceArray, T[] addArray)        {            sourceArray = 

sourceArray.Concat

<T>(addArray).ToArray();            return sourceArray;        }同样的测试代码:
        [TestMethod()]        public void AddTest()        {            int[] _source = new int[3] { 1, 2, 3 };            int[] _expected = new int[4] { 1, 2, 3, 4 };            _source = _source.Add(4);            CollectionAssert.AreEqual(_source, _expected);        }        [TestMethod()]        public void AddRangeTest()        {            int[] _source = new int[3] { 1, 2, 3 };            int[] _expected = new int[6] { 1, 2, 3, 4, 5, 6 };            _source = _source.AddRange(new int[3] { 4, 5, 6 });            CollectionAssert.AreEqual(_source, _expected);        }

测试结果:

image

希望有所帮助!


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