how to insert bytes into array with shifting?-CodePudding

I have a byte array, for example:

{0,1,2,3,4,5,6,7,8,9}

I want to insert the smaller array into:

The array which I want to insert after the third index of the original array:

{11,11,11}

So the final array should look like this:

{0,1,2,3,11,11,11,4,5,6,7,8,9}

as you can see I need to keep the original values of the array, shift them left, and put the new array instead of it. I was looking into Array.Copy() But it's overwriting the original values, not shifting them

CodePudding user response：

You can try using Linq to query array and assign the result back to it:

 using System.Linq;

 ...

 int[] array = new int[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
 int[] insert = new int[] {11, 11, 11};

 array = array
   .Take(4)
   .Concat(insert)
   .Concat(array.Skip(4)) 
   .ToArray();

If you are looking for low level Array methods:

int[] array = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int[] insert = new int[] { 11, 11, 11 };

int at = 4;

Array.Resize<int>(ref array, array.Length   insert.Length);

Array.Copy(array, at, array, at   insert.Length, array.Length - at - insert.Length);
Array.Copy(insert, 0, array, at, insert.Length);

CodePudding user response：

You can convert your array to an list. A list is like an array, but you can easily add, insert or remove values. See this code:

int[] array = new int[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
int[] insert = new int[] {11, 11, 11};

List<int> list = new List<int>(array);
list.InsertRange(4, insert);
        
array = list.ToArray(); // convert the list back to an array

Online demo: https://dotnetfiddle.net/GeEAeU