下面是一个使用Array.CopyTo的简单示例。 我认为它回答了你的问题，并给出了一个CopyTo使用的例子-当我需要使用这个函数时，我总是感到困惑，因为帮助有点不清楚-索引是目标数组中插入发生的位置。

int[] xSrc1 = new int[3] { 0, 1, 2 };
int[] xSrc2 = new int[5] { 3, 4, 5, 6 , 7 };

int[] xAll = new int[xSrc1.Length + xSrc2.Length];
xSrc1.CopyTo(xAll, 0);
xSrc2.CopyTo(xAll, xSrc1.Length);

我想你不能再简单了。

如果你在一个数组中有源数组，你可以使用SelectMany:

var arrays = new[]{new[]{1, 2, 3}, new[]{4, 5, 6}};
var combined = arrays.SelectMany(a => a).ToArray();
foreach (var v in combined) Console.WriteLine(v);   

给了

1
2
3
4
5
6

这可能不是最快的方法，但根据用例可能适合。

string[] names1 = new string[] { "Ava", "Emma", "Olivia" };
string[] names2 = new string[] { "Olivia", "Sophia", "Emma" };
List<string> arr = new List<string>(names1.Length + names2.Length);
arr.AddRange(names1);
arr.AddRange(names2);
string[] result = arr.Distinct().ToArray();
foreach(string str in result)
{
    Console.WriteLine(str.ToString());
}

Console.ReadLine();

在c# 3.0中，你可以使用LINQ的Concat方法轻松实现:

int[] front = { 1, 2, 3, 4 };
int[] back = { 5, 6, 7, 8 };
int[] combined = front.Concat(back).ToArray();

在c# 2.0中，你没有这样直接的方法，但是数组。复制可能是最好的解决方案:

int[] front = { 1, 2, 3, 4 };
int[] back = { 5, 6, 7, 8 };

int[] combined = new int[front.Length + back.Length];
Array.Copy(front, combined, front.Length);
Array.Copy(back, 0, combined, front.Length, back.Length);

这可以很容易地用于实现您自己的Concat版本。

连接多个数组的简单代码:

string[] arr1 = ...
string[] arr2 = ...
string[] arr3 = ...    
List<string> arr = new List<string>(arr1.Length + arr2.Length + arr3.Length);
arr.AddRange(arr1);
arr.AddRange(arr2);
arr.AddRange(arr3);
string[] result = arr.ToArray();

如果有人正在寻找如何合并两个图像字节数组:

        private void LoadImage()
        {
            string src = string.empty;
            byte[] mergedImageData = new byte[0];

            mergedImageData = MergeTwoImageByteArrays(watermarkByteArray, backgroundImageByteArray);
            src = "data:image/png;base64," + Convert.ToBase64String(mergedImageData);
            MyImage.ImageUrl = src;
        }

        private byte[] MergeTwoImageByteArrays(byte[] imageBytes, byte[] imageBaseBytes)
        {
            byte[] mergedImageData = new byte[0];
            using (var msBase = new MemoryStream(imageBaseBytes))
            {
                System.Drawing.Image imgBase = System.Drawing.Image.FromStream(msBase);
                Graphics gBase = Graphics.FromImage(imgBase);
                using (var msInfo = new MemoryStream(imageBytes))
                {
                    System.Drawing.Image imgInfo = System.Drawing.Image.FromStream(msInfo);
                    Graphics gInfo = Graphics.FromImage(imgInfo);
                    gBase.DrawImage(imgInfo, new Point(0, 0));
                    //imgBase.Save(Server.MapPath("_____testImg.png"), ImageFormat.Png);
                    MemoryStream mergedImageStream = new MemoryStream();
                    imgBase.Save(mergedImageStream, ImageFormat.Png);
                    mergedImageData = mergedImageStream.ToArray();
                    mergedImageStream.Close();
                }
            }
            return mergedImageData;
        }