Linq expression .Any(List<string>)

Question

I have an List containting (among other things) Remark1, Remark2 and Remark3. I'd like to make sure that only valid remarks are written in these fields. Today I check it like this:

foreach (GradeRow row in Grade.GradeRows)
{
    if (!(okRemarks.Contains(row.Remark1) && okRemarks.Contains(row.Remark2) && okRemarks.Contains(row.Remark3)))
    {
        FailedCourseCodes.Add(row.CourseCode);
    }
}

Is there a Linq expression that can do something like .Contains(List)?

Answer 1

You still have to check each field individually but you can eliminate the loop:

FailedCourseCodes.Add(
    Grade.GradeRows.Where(row=>
        okRemarks.Contains(row.Remark1) && 
        okRemarks.Contains(row.Remark2) && 
        okRemarks.Contains(row.Remark3)
        )
);

You could make it slightly shorter by creating an array from the fields:

FailedCourseCodes.Add(
    Grade.GradeRows.Where(row=>
        (new [] {row.Remark1, row.Remark2, row.Remark3})
            .Except(okRemarks).Any()
        )
);

but that's significantly harder to read in my opinion.

Answer 2

诸如此类的东西将返回所有包含不良备注的行：

 Grade.GradeRows.Where( row => new string[]{row.Remark1, row.Remark2, Row.Remark3}.Any ( remark => !okRemarks.Any(remark)))

Answer 3

.Intersect( IEnumerable ) and then comparing the result's Count() is the only option I can think of. Something in the lines of:

foreach( var failedGrade in Grade.GradeRows
                                  .Select( x => new String[]{ row.Remark1, row.Remark2, row.Remark3 } )
                                  .Where( remarks => remarks.Intersect( okRemarks ).Count() < remarks.Length ) )
{
    FailedCourseCodes.Add(failedGrade.CourseCode);
}

@d-Stanley got it right, but did not add the results correctly

foreach( var failedGrade in Grade.GradeRows.Where( row => !(
                                                okRemarks.Contains(row.Remark1) &&
                                                okRemarks.Contains(row.Remark2) &&
                                                okRemarks.Contains(row.Remark3) ) ) )
{
    FailedCourseCodes.Add(failedGrade.CourseCode);
}