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I'm currently trying to set an int that is null, similar to how strings can be null. I've tried: int i = null; which returns Cannot convert null to 'int' because it is a non-nullable value type but string s = null; Is perfectly fine.

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  • You need a nullable type. i.e. int? Commented Jul 25, 2019 at 17:11
  • 1
    You'll have to use Nullable<int> or simply int? i = null; Commented Jul 25, 2019 at 17:11
  • Why do you want a null value type? Commented Jul 25, 2019 at 17:12
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    You should include the error rather than just saying "doesn't work". Commented Jul 25, 2019 at 17:13

3 Answers 3

Reset to default
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So value types by default can't be set to null, there are however ways to get them to set to null. To solve your issue you would need to do this: int? i = null;

This comes from the Microsoft docs here: https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/

Value Types versus Reference Types can be found here: https://www.tutorialsteacher.com/csharp/csharp-value-type-and-reference-type

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1

You can use question mark to make it nullable, like that:

int? x = null;
Console.WriteLine(x.Value);

This might help: make nullable reference types in c#

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Would be good to mention that this is no longer a value type (or an int). Value types cannot be set to null.
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Just add ? to the end of the type

int? nullInt = null;
if (nullInt == null) {
Console.WriteLine("nullInt is null");
}
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