Why this Conditional operator error? [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Conditional operator assignment with Nullable<value> 开发者_运维问答types?

Hi, Why this doesn't work?

  DateTime? SomeNullableDateTime = string.IsNullOrEmpty("") ? null : Convert.ToDateTime("01/02/1982");  

Is it an error somewhere? The problem seems to be the null because

  DateTime? SomeNullableDateTime = string.IsNullOrEmpty("") ? Convert.ToDateTime("01/02/1982") : Convert.ToDateTime("01/02/1982"); 

Works fine..

Thanks

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Both conditional values need to be of the same type or allow implicit conversion from one type to another, like so:

DateTime? SomeNullableDateTime = string.IsNullOrEmpty("") ? (DateTime?)null : Convert.ToDateTime("01/02/1982");

More information can be found here, but to summarize:

Either the type of first_expression and second_expression must be the same, or an implicit conversion must exist from one type to the other.

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Because null and Convert.ToDateTime are not the same type.

You can use this:

DateTime? SomeNullableDateTime = string.IsNullOrEmpty("") ? (DateTime?)null : new DateTime?(Convert.ToDateTime("01/02/1982"));