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c#if-statementoperatorsnullable
sprocket12
sprocket12

Reputation: 5488

C# tertiary if operator giving issue with nullable double

I have a nullable double 

MyNullableDouble = MyDouble == 0 ? null : MyDouble;

This is causing me an issue :

Type of conditional expression cannot be determined because there is no implicit conversion between '' and 'double'

Upvotes: 1

Views: 759

Answers (3)

Egor4eg
Egor4eg

Reputation: 2708

You can implement a generic approach to handle such situations. Since all Nullable types have GetValueOrDefault method, you can write an opposite method for non-Nullable structures:

    public static T? GetNullIfDefault<T>(this T value)
        where T: struct
    {
        if( value.Equals(default(T)))
        {
            return null;
        }

        return value;
    }

Example of usage:

MyNullableDouble = MyDouble.GetNullIfDefault();

Upvotes: 0

Rahul Ranjan
Rahul Ranjan

Reputation: 26

yes,you cannot do like this ,both the value should be of same data type.Any specific reason to use tertiary..use if else ...

Upvotes: 0

Tobia Zambon
Tobia Zambon

Reputation: 7629

you should cast Mydouble, otherwise on the left side you have type double? while in the right part you have double, so types are not equivalent (and that's exactly what the exception is saying):

MyNullableDouble = MyDouble == 0 ? null : (double?)MyDouble;

Upvotes: 5

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