[C#]Array 添加扩展

时间:2022-09-19 17:37:53

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:

[C#]Array 添加扩展

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:

[C#]Array 添加扩展

希望有所帮助!