I am not able solve the issue

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List<long> key = rateCardData.Select(x => x.RateTableCategory2.RateCategoryID2).ToList();

The cast to value type 'Int64' failed because the materialized value is null. Either the result type's generic parameter or the query must use a nullable type.

What I have tried:

I am getting error in this line

List<long> key = rateCardData.Select(x => x.RateTableCategory2.RateCategoryID2).ToList();

not getting any build error

Posted 3-Jan-17 17:39pm

murkalkiran

Updated 3-Jan-17 21:56pm

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Catcher Wong · Answer 1 · 2017-01-03T21:56:00

Solution 3

hey,murkalkiran

You should check whether RateTableCategory2 is null or whether RateTableCategory2.RateCategoryID2 can cast to long! The error looks like that the datasource rateCardData has some null value.

It won't cause the build errors ,but the runtime errors.

Posted 3-Jan-17 21:56pm

Catcher Wong

vivvicks · Answer 2 · 2017-01-03T17:48:00

Solution 1

either x.RateTableCategory2.RateCategoryID2 its returns int(other than long) or its return type should be nullable.

Posted 3-Jan-17 17:48pm

vivvicks

Sanjay K. Gupta · Answer 3 · 2017-01-03T18:17:00

Solution 2

try this

List<long> key = rateCardData.Select(x=>.RateTableCategory2.RateCategoryID2).ToList<long>();

or

List<long> key =(List<long>) rateCardData.Select(x=>.RateTableCategory2.RateCategoryID2).ToList();

Posted 3-Jan-17 18:17pm

Sanjay K. Gupta