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Type of conditional expression cannot be determined because there is no implicit convertion between null and int

I have a few fields that I'm reading from an excel file that could be blank (null) or with values (int or decimal).

Below is the code I've written, but it seemed like the conditional statement would not work as there is a type mismatch between the true/false statement. Is there a way to convert to a nullable type in the false statement?

Thanks in advance.  
decimal? paid = dReader["PAID_" + dynColsSuffix] == null ? null : Convert.ToDecimal(dReader["PAID_" + dynColsSuffix]);

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ngobw
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ngobw
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steezaCommented:
The compiler is unable to determine the type of the null part of your statement.
I don't have a C# compiler handy and haven't used it in a while, but you should have 2 ways of dealing with this:

a) Cast your null to a decimal? Ie. (decimal?)null
b) Let the statement return a decimal such as 0.0 when the column is null.
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GuitarRichCommented:
Try this - or you could write your own ToDecimalNullable function that returned a decimal?

decimal? paid = dReader["PAID_" + dynColsSuffix] == null ? null : (decimal?)dReader["PAID_" + dynColsSuffix];
 

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tcullerCommented:
I think what the problem here is that index of dReader is returning a struct of some kind. A struct cannot be compared to null. What is the exact type of "dReader"?

The last part of your statement (the Convert.ToDecimal) is not your problem here--there is always an implicit conversion from a non-nullable into a nullable (just not vice versa -- use the Coalesce operator ( "??")).
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