CODEWITHSUNDEEP
c#datetimenull
markzzz
markzzz

Reputation: 47945

Why I can't to this assignment?

This is my code:

DateTime? test;
test = ((objectParsed.birthday != null) ? DateTime.Parse((string)objectParsed.birthday : null));

Why can I not set that variable to null?

Upvotes: 1

Views: 118

Answers (3)

David
David

Reputation: 218847

Aside from anything to do with Nullable<T> (in this case, DateTime?), the error is happening specifically here:

((objectParsed.birthday != null) ? DateTime.Parse((string)objectParsed.birthday : null))

Note that there's no mention of a nullable DateTime in this code. And before the result of this code is assigned to a nullable DateTime, this code by itself needs to be evaluated. It can't be, because of the error you're seeing.

The operator being used (: ?) needs to be able to infer types from all arguments to the operation, and those types need to be able to match. Here you're passing it a DateTime and null which can't be matched. Try casting one of the arguments:

((objectParsed.birthday != null) ? (DateTime?)DateTime.Parse((string)objectParsed.birthday : null))

Upvotes: 3

Grundy
Grundy

Reputation: 13381

You can't set null in this case because ternary operator must return values same types try this:

test = (objectParsed.birthday != null) ? (DateTime?)DateTime.Parse((string)objectParsed.birthday): null;

Upvotes: 1

opalenzuela
opalenzuela

Reputation: 3171

Try with

 test = ((objectParsed.birthday != null) ? DateTime.Parse((string)objectParsed.birthday): null;

Explanation: the structure of a ternary operator is:

variable = (condition)?(value if yes):(value if no);

Upvotes: 0

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