Several methods of copying arrays in C#

I suddenly learned it, so I put it on my blog to share it, just think of it as a learning diary.

First of all, let me explain that the array is a reference type, so be careful not to copy the address but not the value when copying!

In fact, when copying an array, you must use new to open up a new space in the heap specifically for storing the array, so that it is effective.

(1)

int[] pins = { 9, 3, 7, 2 };
 
int[] copy=new int[pins.length];
 
     for (int i = 0; i < copy.length; i++)
 
     {
 
       copy[i] = pins[i];
 
   }

(2)

int[] copy = new int[pins.Length];
 
pins.CopyTo(copy, 0);

(3)

Int[] pins= new int[4]{9,3,7,2};
 
Int[] alias=pins;

Note that this kind of copy is just a reference, it just passes the address of the data to the alias array, so it is not recommended to copy the array in this way;

(4)

Array.Copy(pins,copy,copy.Length)

(5)

Int[] copy=(int[])pins.Clone();

Here is why the forced type conversion of int[] is used. The reason is that the result type of Clone is object. So it needs to be cast to int[]

The Object class is actually the base class of all our classes.

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