c# - 将一个字符串数组复制到另一个

Question

我怎样才能string[]从另一个复制一个string[]？

假设我有string[] args. 如何将其复制到另一个数组string[] args1？

Answer 1

• 要创建一个具有相同内容的全新数组（作为浅拷贝）：调用Array.Clone并转换结果。
• 要将字符串数组的一部分复制到另一个字符串数组中：调用Array.Copy或Array.CopyTo

例如：

using System;

class Test
{
    static void Main(string[] args)
    {
        // Clone the whole array
        string[] args2 = (string[]) args.Clone();

        // Copy the five elements with indexes 2-6
        // from args into args3, stating from
        // index 2 of args3.
        string[] args3 = new string[5];
        Array.Copy(args, 2, args3, 0, 5);

        // Copy whole of args into args4, starting from
        // index 2 (of args4)
        string[] args4 = new string[args.Length+2];
        args.CopyTo(args4, 2);
    }
}

假设我们从args = { "a", "b", "c", "d", "e", "f", "g", "h" }结果开始：

args2 = { "a", "b", "c", "d", "e", "f", "g", "h" }
args3 = { "c", "d", "e", "f", "g" }
args4 = { null, null, "a", "b", "c", "d", "e", "f", "g", "h" } 

Answer 2

为使用 Array.CopyTo() 的目标数组分配空间：

targetArray = new string[sourceArray.Length];
sourceArray.CopyTo( targetArray, 0 );

Answer 3

上面的答案显示了一个浅克隆；所以我想我使用序列化添加一个深度克隆示例；当然，也可以通过循环遍历原始数组并将每个元素复制到一个全新的数组中来完成深度克隆。

 private static T[] ArrayDeepCopy<T>(T[] source)
        {
            using (var ms = new MemoryStream())
            {
                var bf = new BinaryFormatter{Context = new StreamingContext(StreamingContextStates.Clone)};
                bf.Serialize(ms, source);
                ms.Position = 0;
                return (T[]) bf.Deserialize(ms);
            }
        }

测试深度克隆：

 private static void ArrayDeepCloneTest()
        {
            //a testing array
            CultureInfo[] secTestArray = { new CultureInfo("en-US", false), new CultureInfo("fr-FR") };

            //deep clone
            var secCloneArray = ArrayDeepCopy(secTestArray);

            //print out the cloned array
            Array.ForEach(secCloneArray, x => Console.WriteLine(x.DateTimeFormat.DateSeparator));

            //modify the original array
            secTestArray[0].DateTimeFormat.DateSeparator = "-";

            Console.WriteLine();
            //show the (deep) cloned array unchanged whereas a shallow clone would reflect the change...
            Array.ForEach(secCloneArray, x => Console.WriteLine(x.DateTimeFormat.DateSeparator));
        }