Array reallocation question

[Oleg Subachev]

Are existing elements in the array preserved when array is reallocated ?

int[] A = new int[1];
A[0] = 1;
A = new int[ A.Length + 1 ];
A[1] = 2;

Will A[0] be 1 at this point ?

Oleg Subachev

 

[Marc Gravell]

No, they aren't. the new array is wiped to 0s. You could, however, create
the new array in a second variable, then oldArray.CopyTo(newArray, 0) to get
the values from the old array to the new array.

However, if you are going to be doing this often, then maybe you are using
the wrong object structure? Maybe use a list or collection wrapper?

Marc

 

[Noah Sham]

What happens when you run the code in the debugger?