nullable Archives - IT Nursery

C#, Programming

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How does comparison operator works with null int?

I am starting to learn nullable types and ran into following behavior. While trying nullable int, i see comparison operator gives me unexpected ...

June 4, 2022
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PHP, Programming

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Nullable return types in PHP7

PHP 7 introduces return type declarations. Which means I can now indicate the return value is a certain class, interface, array, callable or ...

June 3, 2022
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nullable, Programming

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In Kotlin, what is the idiomatic way to deal with nullable values, referencing or converting them

If I have a nullable type Xyz?, I want to reference it or convert it to a non-nullable type Xyz. What is the ...

June 2, 2022
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C#, Programming

IT Nursery

How to set enum to null

I have an enum string name; public enum Color { Red, Green, Yellow } How to set it to NULL on load. name ...

May 27, 2022
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C#, Programming

IT Nursery

Type of conditional expression cannot be determined because there is no implicit conversion between ‘int’ and

Why does this not compile? int? number = true ? 5 : null; Type of conditional expression cannot be determined because there is ...

May 27, 2022
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How to check if an object is nullable?

How do I check if a given object is nullable in other words how to implement the following method… bool IsNullableValueType(object o) { ...

May 26, 2022
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Correct way to check if a type is Nullable [duplicate]

This question already has answers here: How to check if an object is nullable? (14 answers) Closed 9 years ago. In order to ...

May 26, 2022
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nullable object must have a value

There is paradox in the exception description: Nullable object must have a value (?!) This is the problem: I have a DateTimeExtended class, ...

May 24, 2022
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Nullable types and the ternary operator: why is `? 10 : null` forbidden? [duplicate]

This question already has answers here: Conditional operator assignment with Nullable<value> types? (6 answers) Why doesn’t this C# code compile? (4 answers) Closed ...

May 21, 2022
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How can I format a nullable DateTime with ToString()?

How can I convert the nullable DateTime dt2 to a formatted string? DateTime dt = DateTime.Now; Console.WriteLine(dt.ToString("yyyy-MM-dd hh:mm:ss")); //works DateTime? dt2 = DateTime.Now; ...

May 21, 2022
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