如何将int数组转换为可为null的int数组？

Question

Let's say I have an array containing x members and I want to create another array with the same Length ( x ) and the same integer values:

int[] arr = new int[x];
int?[] nullable_arr = arr;

And I can't do this:

int?[] arr = new int[x];

Is there an explicit conversion to a nullable type array or something I am not aware of?

Yes, I could simply convert each value in a loop but I'm asking if there is already an easy short way of doing this.

Answer 1

I suggest using Linq :

 int?[] nullable_arr = arr
   .Select(item => new int?(item))
   .ToArray();

Answer 2

Another aproach by using Array.ConvertAll method

var values = new[] {1, 2, 3, 4};
var nullableValues = Array.ConvertAll(ints, value => new int?(value));

Or with providing generic types explicitly

var nullableValues = Array.ConvertAll<int, int?>(ints, value => value);

Answer 3

您可以使用来自Linq的Cast

int?[] arrNull = arr.Cast<int?>().ToArray();