Question

I am wondering if there is a way to create a concatenated WHERE clause using an array of int. I need to get the results for the entire array combined. Can I do something like:

public ViewResult Results(int? programId, int? programYear, int? programTypeId, string toDate, string fromDate, int?[] programTypeIdList, int?[] programIdList)
{
    surveyResponseRepository.Get().Any(x => x.ProgramId == programIdList);
}

Answer 1

Use Contains:

surveyResponseRepository.Get().Any(x => programIdList.Contains(x.ProgramId));

Though that will tell you if ANY result meets that criteria.

I suspect you want to use Where instead of Any:

surveyResponseRepository.Get().Where(x => programIdList.Contains(x.ProgramId));

Also, why are you using an array of nullable ints? If you’re trying to make the parameter optional, just leave it as an array of regular ints and check for null:

public ViewResult Results(int? programId, int? programYear, int? programTypeId, string toDate, string fromDate, int[] programTypeIdList, int[] programIdList)
{
    return surveyResponseRepository.Get()
        .Where(x => programIdList == NULL 
                    || programIdList.Contains(x.ProgramId));

}