Question

I have a struct named CheckedNumber. This type is used in a property:

`public IList<CheckedNumber> CheckedNumbers { get { return this._checkedNumbers; } }` 

…to keep a list of numbers.

I have another property:

`public int? TheNumber { get { return this._theNumber; } }`

…and want to check if its value exists in the CheckedNumbers list.

this:

if (this.CheckedNumbers.Contains(this.TheNumber)) { //... }

gives error:

Argument 1: cannot convert from 'int?' to 'ProjectName.Models.CheckedNumber'

How could I convert int? to my struct type?

Answer 1

Okay, now the question is slightly clearer – but fundamentally, you’re asking whether a list of CheckedNumber values contains a particular int? value. That makes no sense, as an int? isn’t a CheckedNumber – it’s like asking whether a List<Fruit> contains a car.

If part or your CheckedNumber struct is an int?, you might want:

if (CheckedNumbers.Any(x => x.SomeProperty == TheNumber))

Alternatively, you might want:

if (CheckedNumbers.Contains(new CheckedNumber(TheNumber)))

Otherwise, you’ll have to clarify the question further.